Junior electrical engineer Uttrakhand, KAU-07_Ele._Engg.-I_set-A_1

को

1. The best suitable material for the heating element is ?




... Answer is B)
Nichrom - 80% nickel and 20% chromium
silver-grey colour
melting point 1400 °C.

2. Pure silicon is ?




... Answer is C)
Pure silicone is an intrinsic semiconductor means undoped semiconductor.

3. Impurity atoms to be added to pure silicon in order to make a p-type semiconductor belongs to ?




... Answer is B,D)
For P type, impurities are trivalent --
Boron, Gallium, Indium, Aluminium
and they are called acceptor impurity.
For N type, impurities are pentavalent --
Phosphorous, Arsenic, Antimony, Bismuth
and the are called donor impurity
.

4. Resistivity of a wire depends upon ?




... Answer is A)
Resistivity of a wire depends upon material

The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity.
It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is
.

5. If a ferromagnetic material is heated upto Curie temperature, it becomes ?




... Answer is D)
भौतिकी विज्ञान में क्यूरी ताप (Curie temperature (Tc)) या क्यूरी बिन्दु (Curie point) वह ताप है जिस पर उस पदार्थ का स्थायी चुम्बकत्व समाप्त हो जाता है और केवल प्रेरित चुम्बकत्व ही शेष रहता है।

If a ferromagnetic material is heated upto Curie temperature, it becomes Paramagnetic material
.

6. At absolute zero temperature, an intrinsic semiconductor behaves as ?




... Answer is C)
The electricity conductivity of a semiconductor at 0K is zero.
hence resistivity (= 1/electrical conductivity) is infinity.
The temperature is called absolute zero, and it's the lowest possible temperature. It is equal to -273oC or 0K.


7. In an intrinsic semiconductor the Fermi level is ?




... Answer is D)
The highest energy level that an electron can occupy at the absolute zero temperature is known as the Fermi Level.
The Fermi level lies between the valence band and conduction band because at absolute zero temperature the electrons are all in the lowest energy state.


8. The reluctance offered by a magnetic material is highest when it is ?




... Answer is A)
Materials that are easily magnetised have a low reluctance and a high permeability, and non-magnetic materials have a high reluctance and a low permeability.

The reluctance offered by a magnetic material is highest when it is diamagnetic.
Actually, diamagnetic substance placed in magnetic field , acquire feeble magnetism opposite to the direction of the magnetic field.


9. If temperature of a pure silicon specimen is increased, then ?




... Answer is C)
If temperature of a pure silicon specimen is increased, then number of free holes and free electrons increases .

10. Varnishes protect the insulating materials against ?




... Answer is B)
varnishes protect insulation materials against, moisture, chemical, abrasion, and thermal resistance, as well as being oil proof..

11. A 220 V heater is used on 110 V supply, the heat produced by it will be nearly ?




... Answer is C)
If a 220V appliance is plugged into 110V then the power drawn will be 1/4th.

First case
when heater connect with 220V suppy and R is heater resistance.
Heat produced P1 = $V^2$/R = 220*220/R ------- (1)

Second case
when heater connected with 110V supply
Heat produced P2 = $V^2$/R = 110*110/R ------ (2)



equation 1/2

P1/P2 = 1/4



12. Two sinusoidal currents are given by following equations :
i1 = 10 sin ( wt +π/3)
i2 = 15 sin ( wt -π/4)
The phase difference between them is?




... Answer is A)
π/3 + π/4 = 60 + 45 = 105.

13. The reactance offered by a capacitor to an alternating current of frequency 50 Hz is 10 ohm. If frequency is increased to 100 Hz, the reactance will be ?




... Answer is B)
Xc = 1/ωc = 1/2πfc

I case = 1/2π*50*c = 10

c = 1/1000π

Now in 100Hz

Xc' = 1/2πfc = (1/2π*100)*1000π = 5Ω

.

14. The r.m.s. value of a half-wave rectified alternating current is 10 A. Its value for full-wave rectification will be ?




... Answer is C)
The r.m.s. value of a half-wave rectified alternating current is = Im/2 = 10
Im = 20

The r.m.s. value of a full-wave rectified alternating current is = Im/√2 = 20/√2
.

15. In the following figure, the resistance measured across A and B will be ?




... Answer is D)
We know a capacitor in steady state act as an insulator in a circuit.

so Req = 200 kΩ


16. In the following figure, the voltage across C1 will be ?




... Answer is B)

Source Voltage Vs = 300V

C1 and C2 are in series so Ceq = (1µf*2µf)/(1µf+2µf) = 2/3 µf



Voltage across C1 = Vs * Ceq/C1 = 300 * (3/2)/1
= 200 V
.

17. An alternating current given by i = 14.14 sin( wt + π/6) has an r.m.s. value of ?




... Answer is B)

i rms = Im/√2 = 14.14/1.414
= 10A.


18. In the following figure, resistor R2 becomes open circuited, the reading of voltmeter will be ?




... Answer is D)
Due to R2 open circuit, no current is flow in circuit so there is no voltage drop and full source voltage will appare across R2 .

19. The capacity of a battery is measured in ?




... Answer is D)
Units of Battery Capacity: Ampere Hours

The energy stored in a battery, called the battery capacity, is measured in either watt-hours (Wh), kilowatt-hours (kWh), or ampere-hours (Ahr).
The most common measure of battery capacity is Ah.


20. If both the number of turns and core length of an inductive coil are doubled, then its self inductance will be ?




... Answer is B)
self inductance of a coil L = Nφ/I
Where:
L is in Henries
N is the Number of Turns
Φ is the Magnetic Flux
Ι is in Amperes

Inductance Example

A hollow air cored inductor coil consists of 500 turns of copper wire which produces a magnetic flux of 10mWb when passing a DC current of 10 amps. Calculate the self-inductance of the coil in Henries.
self inductance of a coil L = Nφ/I = 500*10*$10^-3$ /10 = 0.5 H


self-inductance for an air cored coil (solenoid) is given as:
coefficient of self inductance L= μ0 * $N^2$ * A / ℓ
Where:
L is in Henries
μο is the Permeability of Free Space (4.π.$10^-7$)
N is the Number of turns
A is the Inner Core Area (πr 2) in m2
ℓ is the length of the Coil in metres
So now in Our Question ..
L∝$N^2$/l
L: Self Inductance of the coil.
N: Number of turns of the coil.
l: Length of the coil.
Hence,
L2/L1=$(N2/N1)^2$ *(l1/l2)
Now given that N2=2N1 and l2=2l1
L2/L1=4(1/2)=2
or, L2=2L1
Hence the Self Inductance is doubled. .

21. Mutual inductance between two magnetically coupled coils depends on ?




... Answer is D)
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22. For sinusoidal waveform, the ratio of average value to r.m.s. value is ?




... Answer is D)
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23. For an RLC series AC circuit, the current at series resistance is ?




... Answer is C)
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24. If v = (a + jb) and i = (c + jd), then active power is given by ?




... Answer is B)
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25. The voltage phasor of a circuit is 10 Ð15° V and current phasor is 2 Ж45° A. The reactive power in the circuit will be ?




... Answer is A)
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26. If a capacitance is charged by a square wave current source, then the voltage across the capacitor will be ?




... Answer is C)
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27. In the circuit shown below, the terminals A and B are short circuited, the current drawn from the battery is ?




... Answer is B)
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28. In the following circuit, the equivalent capacitance between terminals A and B is ?




... Answer is C)
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29. The output voltage of a battery drops from 100 V with zero load current to 80 V when load current is 2 A. The internal resistance of the battery is ?




... Answer is A)
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30. A charge of 0.1 coulomb moves through a given point in every 0.05 seconds. The current flowing through the point is ?




... Answer is C)
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31. Which of the following capacitors are used in D.C. circuits ?




... Answer is D)
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32. In an RLC series AC circuit, if frequency is below the resonant frequency, then ?




... Answer is C)
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33. An R-L series AC circuit has R = 10 ohm and XL = 10 ohm. It is connected to an AC voltage source, the phase angle between voltage and current is ?




... Answer is B)
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34. The current I flowing in the following circuit is ?




... Answer is A)
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35. The capacitance of a capacitor is not affected by ?




... Answer is D)
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36. A 220 V, 200 W bulb and a 220 V, 100 W bulb are connected in series across a 220 V supply, the power consumed by them will be ?




... Answer is B)
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37. The direction of inducted e.m.f. can be found with the help of ?




... Answer is C)
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38. If 1 ampere current is flowing through a 100 mH coil, then energy stored in the coil is ?




... Answer is A)
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39. In the following figure, the equivalent resistance at terminals A and B will be ?




... Answer is C)
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40. The maximum power dissipation in a resistance from a battery of electromotive force ‘E’ and internal resistance ‘r’ will be ?




... Answer is B)
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41. Two heater wires of equal length are connected first in series and then in parallel. The ratio of heat generated from series to parallel connection will be ?




... Answer is D)
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42. When the current in a coil is increased from 2 A to 4 A in 0.05 seconds, the e.m.f. induced in the coil is 8 V. The self inductance of the coil is ?




... Answer is C)
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43. The induced e.m.f. will be maximum when a conductor cuts the magnetic field at an angle of ?




... Answer is D)
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44. A delta connected load with resistance of 6 ohm and inductive reactance of 8 ohm in each phase is supplied by a 3-phase, 400 V, 50 Hz, AC supply. The value of total power drawn by the load is ?




... Answer is A)
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45. The frequency of voltage generated in a 4-pole alternator rotating at 1800 r.p.m. is ?




... Answer is C)
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46. A 50 Hz alternator will run at the highest speed if it is wound for ?




... Answer is D)
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47. A transformer having 1000 turns in primary winding is connected to a single phase 250 V a.c. supply. For inducing 400 V in secondary winding, the number of turns in secondary winding must be ?




... Answer is A)
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48. The field poles and armature core of a d.c. generator are laminated in order to reduce ?




... Answer is B)
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49. Which one of the following methods gives voltage regulation higher than the actual value in an alternator ?




... Answer is C)
The preferred order of calculating the voltage regulation is....
ZPF > ASA > MMF > EMF
Emf method is least preferred over the other methods and zpf method gives the accurate results as it does not alter the values.
the given value is very close to actual, it is zpf or asa method of regulation.
the given value is less than actual, it is mmf method.
the given value is more than actual, it is emf method.


50. If speed of a d.c. shunt motor is increased above the rated speed, then the counter e.m.f. ?




... Answer is D)
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51. The open current test in a transformer gives ?




... Answer is A)
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52. The mechanical power developed in a d.c. motor is equal to ?




... Answer is C)
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53. An electric train employing a d.c. series motor is running at a fixed speed. When a sudden drop in voltage of supply takes place, then this results in ?




... Answer is A)
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54. A 220 V dc shunt motor is running at 500 rpm when armature current is 50 A. The value of armature resistance is 0.2 ohm. The speed of motor at the double torque will be ?




... Answer is D)
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55. A 10 kVA 220 V/220 V, 50 Hz transformer shows 340 W in short circuit test and 168 W in open circuit test. Its efficiency at full load and 0.8 power factor lagging is approximately ?




... Answer is B)
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56. If number of poles in lap wound d.c. generator are doubled, the generated e.m.f. will be ?




... Answer is D)
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57. A d.c. series motor has linear magnetization characteristics and negligible armature resistance. The motor speed is ?
where T = load torque




... Answer is B)
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58. The most common type of prime mover used for low speed alternators is ?




... Answer is D)
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59. When speed of an alternator is changed from 3600 rpm to 1800 rpm, the generated emf will be ?




... Answer is A)
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60. The power factor of an alternator is determined by its ?




... Answer is D)
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61. The efficiency of an ordinary transformer is maximum when ?




... Answer is C)
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62. At light load, efficiency of a transformer is low. It is because ?




... Answer is D)
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63. The essential condition for parallel operation of two single phase transformers is that they should have the same ?




... Answer is A)
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64. A transformer transforms ?




... Answer is D)
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65. Which of the following connections of a three phase transformer are best suited for 3-phase, 4-wire service ?




... Answer is B)
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66. Transformers are rated in kVA instead of kW, because ?




... Answer is B)
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67. A transformer has negative voltage regulation when its load power factor is ?




... Answer is B)
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68. A 4-pole dc generator runs at 1500 rpm. The frequency of current in armature winding is ?




... Answer is C)
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69. The no load current in a transformer lags the supply voltage by ?




... Answer is D)
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70. Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of alternators is ?




... Answer is A)
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71.The heat run test of a transformer without its loading is performed by means of ?




... Answer is D)
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72. For a d.c. series motor, which of the following expression is correct assuming torque (T) versus armature current (Ia) characteristics unsaturated ?
where f = air gap flux




... Answer is B)
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73. A d.c. series motor should never be started at ?




... Answer is C)
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74. In a d.c. generator, 8 parallel paths and 16 brushes for collection of current are used. If voltage drop per brush is 1 V, then reduction in the induced e.m.f. will be ?




... Answer is 2)
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75. The input impedance of a common base transistor is ?




... Answer is B)
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76.Transistor can be operated in ?




... Answer is D)
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77. In a BJT ?




... Answer is D)
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78. For any inverting amplifier, the input capacitance due to Miller effect ?




... Answer is A)
the Miller effect accounts for the increase in the equivalent input capacitance of an inverting voltage amplifier due to amplification of the effect of capacitance between the input and output terminals. The virtually increased input capacitance due to the Miller effect.

79. In an amplifier, if voltage shunt negative feedback is employed, then ?




... Answer is C)
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80. Feedback in an amplifier is used to ?




... Answer is A)
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81. Out of the following hybrid parameters of a transistor which has unit of resistance ?




... Answer is B)
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82. A transistor has following currents :
IB = 25 mA
IC = 4.975 A
Then IE is equal to ?




... Answer is C)
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83. When used as a voltage regulator, a zener diode is normally ?




... Answer is B)
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84. The expression for voltage gain Av of a positive feedback amplifier is ?




... Answer is B)
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85. In a single stage amplifier D.C and A.C load lines ?




... Answer is C)
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86. Phase reversed of 180° as compared to input occurs in the output of ?




... Answer is A)
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87. Improper biasing of a transistor circuit leads to ?




... Answer is D)
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88. When a P-N junction is reverse biased ?




... Answer is A)
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89. The current gain of a common emitter transistor is 50. The change in emitter current for a corresponding change of 5 mA in base current will be ?




... Answer is A)
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90. If the maximum current of a half-wave rectified wave is 10 A, its r.m.s value is given by ?




... Answer is A)
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91. A common emitter amplifier is characterized by ?




... Answer is A)
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92. The maximum rectification efficiency of a half-wave rectifier is ?




... Answer is A)
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93. The ripple factor of a power supply is a measure of ?




... Answer is A)
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94. The power dissipation in a transistor is the product of ?




... Answer is A)
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95. Consider the following circuit configurations :
1. Common emitter
2. Common base
3. Emitter follower
The correct sequence in increasing input impedance of these configuration is ?




... Answer is A)
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96. The forbidden gap of a Germanium semiconductor material is ?




... Answer is A)
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97. In the following circuit, forward resistance of diode is zero. For the voltages shown at input and output of the transformer, the d.c. voltage across 5 ohm resistor will be ?




... Answer is A)
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98. P-N junction diode is used for the following application : ?




... Answer is A)
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99. In the following figure, V1 = 8.0 V and V2 = 0 V, Which diode will conduct (assume ideal diodes) ?




... Answer is A)
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100. Which one of the following is a non-maskable interrupt ? ?




... Answer is A)
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101. A balanced modulator is used for generation of which of the following?




... Answer is A)
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102. A FM wave is given as v = 12 sin (6 × 108 t + 5 sin 1250 t). Its carrier frequency is ?




... Answer is A)
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103. An operational amplifier has a differential gain of 100 and a common mode gain of 0.01. Its CMRR will be ?




... Answer is A)
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104. An input of Vi = 5.0 cos wt is given to an Op-Amp integrator circuit. If R = 2.0 M ohm and C = 1.0 µF, then output will be ?




... Answer is A)
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105. The full scale output of an 8 bit DAC for 0 to 10 V range is ?




... Answer is A)
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106. Memory range of a memory chip 1 K is ?




... Answer is A)
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107. Which one of the following gate-symbol combinations is false ?




... Answer is A)
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108. Which one of the following is equal to ––––– A + B ?




... Answer is A)
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109. The basic memory cell in a DRAM is a ?




... Answer is A)
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110. Absorption of radio waves in atmosphere depends on ?




... Answer is A)
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111. Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 n sec. The maximum clock frequency is ?




... Answer is A)
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112. Which IC is a decade counter ?




... Answer is A)
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113. Consider following gates :
1. NAND
2. NOR
3. XOR
Out of these gates, the universal gates are ?




... Answer is A)
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114. How many flip-flops are required to build a binary counter circuit to count from 0 to 1023 ?




... Answer is A)
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115. The number of NAND gates required to implement a function A + A –B + A –B C is equal to ?




... Answer is A)
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116. With reference to following logic circuit, the output will be ?




... Answer is A)
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117. Which of the following are 3 byte instruction set ?




... Answer is A)
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118. In the following Op-Amp circuit, the output Vo is ?




... Answer is A)
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119. Which of the following oscillators is used for generation of high frequency signal ?




... Answer is A)
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120. In a positive edge triggered JK flip-flop, J = 1, K = 0 and clock pulse is rising, Q will be ?




... Answer is A)
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121. Kaplan turbines are used whenever the water head is ?




... Answer is A)
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122. The cost of fuel transportation is minimum in ?




... Answer is A)
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123. Economisers are used to heat ?




... Answer is A)
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124. In thermal power plants, the pressure of working fluid cycle is developed by ?




... Answer is A)
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125. A gas turbine power plant is best suited for ?




... Answer is A)
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126. Out of the following plant categories : (i) Nuclear (ii) Run-off river (iii) Pump storage (iv) Diesel The base load power plants are ?




... Answer is A)
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127. Which of the following components is not a part of hydro-electric plant ?




... Answer is A)
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128. Which one is not a commonly used coolant for fast breeder reactor ?




... Answer is A)
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129. Combined cycle power plants may need ?




... Answer is A)
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130. The pH value of water used for boiler of thermal power plant is ?




... Answer is A)
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131. The expression for power plant output in kilo-watt of a hydro-electric plant is given by ?




... Answer is A)
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132. A cable has inductance of 0.22 mH per kilometer and capacitance of 0.202 µF per kilometer. The surge impedance of the cable is ?




... Answer is A)
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133. The first nuclear power plant was built in India at which place ?




... Answer is A)
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134. Sag of conductors between two electric poles can be determined by? Where W = weight per unit length of conductor in kg/m L = Distance between two poles in metre T = Tension in conductors in kg-m




... Answer is A)
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135. The economic size of a conductor in transmission and distribution lines of electric power is decided by ?




... Answer is A)
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136. Which alternator will have more number of poles ?




... Answer is A)
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137. In an AC transmission line difference in phase of voltage at two ends of the line is due to ?




... Answer is A)
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138. If 5000 kW power is transmitted at 220 kV in place of 11 kV, reduction in the value of electric current will be ?




... Answer is A)
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139. In long AC transmission lines, the receiving end voltage becomes greater than sending end voltage at light load or no load operation. This is due to ?




... Answer is A)
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140. For extra high voltage ac transmission lines, conductors used are ?




... Answer is A)
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141. Which of the following relations is true for long transmission line ?




... Answer is A)
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142. Which of the following is used for power factor improvement in transmission line ?




... Answer is A)
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143. The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the consumer is ?




... Answer is A)
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144. If diameter of each conductor of a transmission line is ‘d’, then the diameter of n-layer stranded conductor will be ?




... Answer is A)
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145. The bundled conductor in EHV transmission line system provides ?




... Answer is A)
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146. Corona losses in transmission lines are minimized when ?




... Answer is A)
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147. The power loss in a transmission line depends on ?




... Answer is A)
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148. The main consideration for operating transmission line at high voltage is ?




... Answer is A)
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149. The presence of earth in case of overhead transmission line ?




... Answer is A)
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150. Effect of increase in temperature in an overhead transmission line is ?




... Answer is A)
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151. A 0-10 A ammeter has a guaranteed accuracy of 1% of full scale deflection, the limiting error while reading 2.5 A will be ?




... Answer is A)
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152. The constant of a given energymeter is 500 revolution/kWh. At the test 4.4 kW full load, meter completes 50 revolutions in 86 seconds. The percentage error of the meter is ?




... Answer is A)
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153. The most efficient form of damping employed in electric instruments is ?




... Answer is A)
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154. Which of the following instruments is equally accurate on ac as well as dc circuits ?




... Answer is A)
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155. The moving system of an indicating type of electrical instrument is subjected to ?




... Answer is A)
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156. Energy meter runs slowly even if power is not used. This error is called ?




... Answer is A)
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157. The type of instruments used mainly for standardizing instruments in laboratories is ?




... Answer is A)
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158. What will happen if a voltmeter is connected like an ammeter in series of the load ?




... Answer is A)
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159. Series resistance required to read 0-250 V with a moving coil instrument of internal resistance 2 ohm and full scale deflection of 50 mA is ?




... Answer is A)
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160. Which of the following is not a method of resistance measurement ?




... Answer is A)
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161. Internal resistance of a micro-ammeter is 500 ohm. Shunt resistance required to increase its range from 0-100 µA to 0-10 A will be approximately ?




... Answer is A)
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162. Hay bridge is suitable for measuring following type of inductance ?




... Answer is A)
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163. The dielectric loss of a capacitance can be measured by ?




... Answer is A)
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164. In a particular meter, the deflecting torque is directly proportional to the current flowing through it, the type of meter is ?




... Answer is A)
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165. For measurement of low resistance, the bridge used is ?




... Answer is A)
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166. While measuring power in a three phase load by two wattmeter method, the reading of two wattmeter are equal and opposite, when ?




... Answer is A)
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167. Megger is used to measure ?




... Answer is A)
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168. If a dynamometer wattmeter is connected in an ac circuit, the power indicated by the wattmeter will be ?




... Answer is A)
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169. The Maxwell bridge is used for measuring ?




... Answer is A)
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170. A compensated wattmeter has its reading corrected for error due to ?




... Answer is A)
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171. A null type of instrument as compared to a deflecting type instrument has ?




... Answer is A)
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172. A digital voltmeter has a read-out range from 0 to 9999 counts. When full scale reading is 9.999 V, the resolution of the instrument will be ?




... Answer is A)
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173. A VTVM can be used to measure ?




... Answer is A)
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174. The sensitivity of a voltmeter using 0-5 mA meter movement is ?




... Answer is A)
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175. Moving coil instruments have which one of the following scales ?




... Answer is A)
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176. Super conducting materials can be used for ?




... Answer is A)
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177. Ferrites are types of ?




... Answer is A)
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178. In which material, valence electrons are tightly bounded to their parent atoms ?




... Answer is A)
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179. The disc of domestic supply energy meter is made of which material ?




... Answer is A)
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180. The material of hair spring used in measuring instruments is made of which of material of the following : ?




... Answer is A)
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