SSC junior Engineer Exam 2013

1. The voltage wave V = Vm sin (ωt – 15o) volts is applied across an A.C. circuit. If the current leads the voltage by 10o and the maximum value of current is Im, then the equation of current is ?

A) i = Im sin (ωt + 5o) amps
B) i = Im sin (ωt – 25o) amps
C) i = Im sin (ωt + 25o) amps
D) i = Im sin (ωt – 5o) amps

... Answer is D)
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2. The average value of current (Iav) of a sinusoidal wave of peak value (Im) is ?

A) Iav = Im/2
B) Iav =π/2 *Im
C) Iav = 2/π *Im
D) Iav = Im/2

... Answer is C)
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3. The emf induced in a coil is given by
e = – N dφ/dt
where e is the emf induced, N is the number of turns and dφ is the instantanceous flux linkage with coil in time dt. The negative sign in the expression is due to

A) Hans Christian Oersted's Law
B) Ampere's Law
C) Michael Faraday's Law
D) Lenz's Law

... Answer is D)
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4. The mutual inductance between two coils having self inductances 3 henry and 12 henry and coupling coefficient 0.85 is 3 henry ?

A) 12.75 henry
B) 5.1 henry
C) 0.425 henry
D) 1.7 henry

... Answer is B)
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5. Resistance temperature coefficient of copper at 20 oC is ?

A) 0.0045/oC
B) 0.0017/oC
C) 0.00493/oC
D) 0.0038/oC

... Answer is C)
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6. The load characteristic of DC shunt generator is determined by DC ?

A) the voltage drop in armature resistance.
B) the voltage drop due to armature reaction, voltage drop due to decreased field current and voltage drop in armature resistance.
C) the voltage drop due to armature reaction and voltage drop in armature resistance
D) the voltage drop due to armature reaction, voltage drop due to decreased field current and voltage drops in armature resistance and field resistance.

... Answer is B)
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7. How many watt-seconds are supplied by a motor developing 2 H.P. (British) for 5 hours ?

A) 2.6856 × 107 watt-seconds
B) 4.476 × 105watt-seconds
C) 2.646 × 107 watt-seconds
D) 6.3943 × 106 watt-seconds

... Answer is A)
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8. A 4-pole generator is running at 1200 rpm. the frequency and time period of the emf generated is its coils are respectively ?

A) 50 Hz, 0.02 sec.
B) 40 Hz, 0.025 sec.
C) 300 Hz, 0.00333 sec.
D) 2400 Hz, 1/2400sec.

... Answer is B)
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9. The single phase Induction Motor (IM) which does not have centrifugal switch is ?

A) capacitor start single phase IM
B) resistance split single phase IM
C) capacitor start capacitor run single phase IM
D) permanent capacitor run single phase IM

... Answer is D)
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10. When a multiplier is added to an existing voltmeter for extending its range, its electromagnetic damping ?

A) remains unaffected
B) increases
C) decreases
D) changes by an amount depending on the controlling torque

... Answer is C)
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11. Phasor diagram of load voltage (V), current in pressure coil (IP) and current in current coil (IC) is shwon in the figure when an electrodynamic wattmeter is used to measure power. The reading of the wattmeter will be proportinal to ?

A) cos (β + ψ)
B) cos ψ
C) cos β cos ψ
D) cos β cos (β + ψ)

... Answer is C)
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12. Two parallel conductors carrying current in opposite directions will exert on each other ?

A) an attractive force
B) a repulsive force
C) an axial force
D) no force

... Answer is B)
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13. The unit of reluctance of magnetic circuit is ?

A) AT/m
B) Weber/m
C) AT/Weber
D) Weber/AT

... Answer is C)
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14. In indicating instruments the springs are mainly used to ?

A) conduct the current to the coils
B) hold the pivot in position
C) control the pointer movement
D) reduce the vibration of the pointer

... Answer is C)
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15. A balanced 3-phase, 3-wire supply feeds balanced star connected resistors. If one of the resistors is disconnected, then the percentage reduction in load will be ?

A) 33.33
B) 50
C) 66.67
D) 75

... Answer is B)
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16. The total flux at the end of a long permanent bar magnet is 100 × 10–6 Wb. The end of this magnet is withdrawn through a 1000 turn coil in 20 1 seconds. The induced e.m.f. in the coil is ?

A) 20.0 V
B) 2.0 V
C) 0.2 V
D) 0.02V

... Answer is B)
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17. In reference to the figure, the voltage waveform v(t) is measured by a PMMC, a PMMC combined with bridge rectifier and a moving iron (MI) instrument. Two lists are prepared thereafter ?

A) N m
B) R K
C) A S
D) M S

... Answer is A)
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18. The switching transistor as shown, carries in the collector side an rms current of 8 mA. If the frequency of rectangular pulse train vi is 50 Hz, then on-time of the transistor is ?

A) 20 ms
B) 6.4 ms
C) 12.8 ms
D) 16 ms

... Answer is C)
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19. An ammeter of resistance Rm is placed in an arrangement as shown in the figure. Material of Rm, Rsh is copper whereas that of RS, RX is manganing. The condition for which the meter performance is compensated against temperature, is ?

A) N m
B) R K
C) A S
D) M S

... Answer is A)
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20. If a 110 V, 50 Hz is applied across a PMMC voltmeter of full-scale range 0–220 V and internal resistance of 10 kΩ, reading of the voltmeter will be ?

A) 0 V
B) 110 2 V
C) 78 V
D) 55 V

... Answer is A)
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21. The maximize the driving torque in an induction type instrument, flux produced by shunt coil and series coil should be ?

A) in phase with each other
B) in quadrature with each other
C) displaced by 45o with respect to each other
D) out of phase with respect to each other

... Answer is B)
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22. To minimize the errors due to lead and contact resistances, low resistances used in electrical measurement work are provided with ?

A) guard rings
B) four terminals
C) thick insulation
D) metal shields

... Answer is B)
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23. Examine the two statements 'A' and 'R' and select your answer. Statement A: Switching of a lamp in house produces noise in a radio.
Statement R: Switching operation produces are across separating contacts.

A) Both A and R arc true and R is a correct
B) Both A and R are true and R is not a correct explanation of
C) A is true but R is false
D) A is false but R is true

... Answer is A)
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24. The small pockets of air in the high voltage cable provide_______relative permittivity, _______ electric field and at these sites breakdown is likely to be initiated ?

A) high, high
B) low, low
C) low, high
D) high, low

... Answer is C)
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25. The capacitance measured between any two cores of a 3-core cable with the sheath earthed is 3µF. The capacitance per phase will be ?

A) 1.5µF
B) 6 µF
C) 1µF
D) None of the above

... Answer is B)
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26. In an insulated cable having core diameter d and overall diameter D, the ratio of maximum to minimum dielectric stress is given by ?

A) (D/d)1/2
B) (D/d)2
C) D/d
D) d/D

... Answer is C)
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27. Compared to the breaking capacity of a circuit breaker, its making capacity should be ?

A) the two are unrelated to each other
B) less
C) more
D) equal

... Answer is C)
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28. In electronic circuits, for blocking the DC component of a voltage signal, a/an________ is connected in series with the voltage source. ?

A) resistor
B) capacitor
C) inductor
D) diode

... Answer is B)
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29. For n-type semiconductor, the doping material is ?

A) tetravalent
B) pentavalent
C) trivalent
D) bivalent

... Answer is B)
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30. An attenuator probe as shown, is connected to an amplifier of input capacitance 0.1 µF. Value of C that must be connected across 100 k to make the overall gain independent of frequency, is ?

A) 0.01 µF
B) 0.1 µF
C) 1 µF
D) 10 µF

... Answer is A)
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31. Silicon content in iron lamination is kept within 5% as it ?

A) makes the material brittle
B) reduces the curie point
C) increases hysteresis loss
D) increases cost

... Answer is A)
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32. A wattmeter is marked 15A/30A, 300V/600V and its scale is marked up to 4500 watts. When the meter is connected for 30 A, 600V, the point indicated 2000 watts. The actual power in the circuit is ?

A) 2000 watts
B) 4000 watts
C) 6000 watts
D) 8000 watts

... Answer is D)
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33. Resistance switching is normally employed in ?

A) bulk oil breakers
B) minimum oil breakers
C) air blast circuit breakers
D) all of A, B and C

... Answer is C)
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34. If the angular frequency of an alternating voltage is ω, then the angular frequency of instantaneous real power absorbed in an ac circuit is ?

A) ω/2
B) ω
C) 3ω
D) 2ω

... Answer is D)
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35. If the transistor having VCE = 5V, VBE = 0.7 V has β = 45, value of R is ?

A) 85.64 k
B) 63.14 k
C) 72.15 k
D) 91.18 k

... Answer is A)
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36. In a balanced 3-phase circuit, the line current is 12 A. When the power is measured by two wattmeter method, one meter reads 11 kW while the other reads zero. Power factor of the load is ?

A) 0
B) 0.5
C) 0.866
D) 1.0

... Answer is B)
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37. In case of frosted GLS lamps, frosting is done by ?

A) acid etching
B) ammonia
C) ozone
D) salt water

... Answer is B)
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38. If the supply polarity to the armature terminals of a separately excited D.C. motor is reversed, the motor will run under ?

A) Regenerative braking condition
B) Plugging condition
C) Dynamic braking condition
D) Normal motoring condition

... Answer is B)
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39. For welding purpose, the secondary transformer used should be capable carrying ?

A) high voltage, high current
B) high voltage, low current
C) low voltage, high current
D) low voltage, low current

... Answer is C)
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40. Which of the following is correct ?

A) Load factor = capacity factor × utilisation factor
B) Utilisation factor = capacity factor × load factor
C) Capacity factor = load factor × utilisation factor
D) Load factor has no relation with capacity factor and utilisation factor

... Answer is C)
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41. In a motor starter, the electromechanical contactor provides inherent protection against ?

A) over-current
B) short-circuit
C) single-phasing
D) under-voltage

... Answer is D)
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42. In the circuit, v is the input voltage applied across the capacitor of 2 F. Current through the capacitor is ?

A) N m
B) R K
C) A S
D) M S

... Answer is A)
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43. In a semiconductor, the resistivity ?

A) depends on voltage
B) depends on current through it
C) depends on temperature
D) None of the above

... Answer is C)
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44. A geyser is operated from 230 V, 50 c/s mains. The frequency of instantaneous power consumed by the geyser is ?

A) 25 c/s
B) 50 c/s
C) 100 c/s
D) 150 c/s

... Answer is C)
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45. Ampere-second is the unit of ?

A) emf
B) power
C) electric charge
D) energy

... Answer is C)
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46. Two lossy capacitors with equal capacitance values and power factors of 0.01 and 0.02 are in parallel, and the combination is supplied from a sinusoidal voltage source. The power factor of the combination is ?

A) 0.03
B) 0.015
C) 0.01
D) 0.0002

... Answer is B)
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47. A voltmeter when connected across a D.C. supply, reads 124 V. When a series combination of the voltmeter and an unknown resistance X is connected across the supply, the meter reads 4 V. If the resistance of the voltmeter is 50 kΩ, the value of X is ?

A) 1.6 kΩ
B) 1.5 kΩ
C) 1600 kΩ
D) 1550 kΩ

... Answer is B)
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48. The purpose of providing a choke in the tubelight is?

A) to eliminate the corona effects
B) to avoid radio interference
C) to improve power factor
D) to limit current to appropriate value

... Answer is D)
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49. In a 3-phase 400 V, 4-wire system, two incandescent lamps, one having 230 V, 100 W specification and the other 230 V, 200 W are connected between R phase-neutral and Y phase-neutral respectively. If the neutral wire breaks ?

A) 100 W lamp will fuse first
B) 200 W lamp will fuse first
C) both the lamps will fuse together
D) both the lamps will glow

... Answer is A)
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50. A solenoid of inductance 250 mH and resistance 10 Ω is connected to a battery. The time taken for the magnetic energy to reach 1/4TH of tis maximum value is ?

A) N m
B) R K
C) A S
D) M S

... Answer is A)
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51. The peak value of the output voltage of a halfwave rectifier is 100 V. The r.m.s. value of the half-wave rectifier output voltage will be ?

A) 100 V
B) 50 V
C) 70.7 V
D) 35.35 V

... Answer is B)
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52. The given circuit represents a ?

A) monostable multivibrator
B) astable multivibrator
C) Schmitt trigger
D) bistable multivibrator

... Answer is C)
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53. The input resistance of a FET is of the order of FET ?

A) 100 Ω
B) 10 kΩ
C) 1 MΩ
D) 100 MΩ

... Answer is D)
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54. In a series R-L circuit supplied from a sinusoidal voltage source, voltage across R and L are 3 V and 4 V respectively. The supply voltage is then ?

A) 7 V
B) 1 V
C) 3.5 V
D) 5 V

... Answer is D)
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55. If the insulation resistance of 2 m long sample of a cable is 10 MΩ, then a 8 m long smaple of the same will have an insulation resistance of ?

A) 40 MΩ
B) 2.5 MΩ
C) 2 MΩ
D) 5.5 MΩ

... Answer is B)
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56. An inductor is supplied from a sinusoidal voltage source. The magnetic field energy in the inductor changes from peak value to minimum value in 10 msec. The supply frequency is ?

A) 50 Hz
B) 25 Hz
C) 1 kHz
D) 100 Hz

... Answer is B)
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57. Two 2000 Ω, 2 watt resistors are connected in parallel. Their combined resistance value and wattage rating are ?

A) 1000Ω, 2 watt
B) 1000Ω, 4 watt
C) 2000Ω, 4 watt
D) 2000Ω, 2 watt

... Answer is B)
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58. We have three resistances each of value 1 Ω, 2Ω and 3Ω. If all the three resistances are to be connected in a circuit, how many different values of equivalent resistance are possible ?

A) Five
B) Six
C) Seven
D) Eight

... Answer is D)
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59. One B.O.T. unit is ?

A) 1000 KWh
B) 10 KWh
C) 1 KWh
D) 0.1 KWh

... Answer is C)
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60. An electric heater draws 1000 watts from a 250 V source. The power drawn from a 200 V souce is ?

A) 800 W
B) 640 W
C) 1000 W
D) 1562.5 W

... Answer is B)
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61. Three 3 µF capacitors are in series. A 6 µF capacitor is in parallel with this series arrangement. The equivalent capacitance of this combination is ?

A) 7 µF
B) 15 µF
C) 3.6 µF
D) 1 µF

... Answer is A)
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62. A D.C. series motor has an armature resistance of 0.06 Ω and series field resistance of 0.08 Ω. The motor is connected to a 400 V supply. The line current is 20 A when the speed of the machine is 110 rpm. When the line current is 50 A and the excitation is increased by 30%, speed of the machine in rpm is ?

A) 1100
B) 1003
C) 837
D) 938

... Answer is C)
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63. The voltage across R, L and C are 3 V, 14 V and 10 V respectively as sin the figure. If the voltage source is sinusoidal, then the input voltage (r.m.s.) is ?

A) 10 V
B) 5 V
C) 2.5 V
D) 15 V

... Answer is B)
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64. In 1-phase series RL circuit fed by voltage source, the resistance and reactance values are 4 ohm each. In this circuit ?

A) the current leads the voltage by 450
B) the current lags the voltage by 450
C) the current lags the voltage by 600
D) None of the above

... Answer is B)
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65. Superposition theorem requires as many circuits to be solved as there are ?

A) nodes
B) sources
C) loops
D) None of the above

... Answer is B)
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66. In squirrel-cage induction motor, the rotor conductors are ?

A) open circuited
B) short circuited via end rings
C) short circuited via external reactance
D) short circuited via external resistance

... Answer is B)
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67. A 3-phase synchronous motor is started by utilizing the torque developed in ?

A) the high-speed steam-turbine.
B) the damper winding on the rotor
C) the damper winding on the stator
D) the low-speed water-turbine

... Answer is B)
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68. If the frequency of input voltage of a transformer is increased keeping the magnitude of the voltage unchanged, then ?

A) both hysteresis loss and eddy current loss in the core will increase
B) hysteresis loss will increase but eddy current loss will decrease.
C) hysteresis loss will increase but eddy current loss will remain unchanged
D) hysteresis loss will decrease but eddy current loss will increase

... Answer is C)
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69. Two single-phase ac motors A and B operate from a 1000 V supply. A consumes 2 kW at a power factor of 0.8 (lagging) and B consumes 1 kW at a power factor of 0.5 (lagging). The total current drawn from the supply is approximately ?

A) 4.5 A
B) 2.1 A
C) 4.41 A
D) 9 A

... Answer is A)
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70. The high-voltage and low-voltage winding resistances of a distribution transformer of 100 KVA, 1100/220 volts. 50 Hz are 0.1Ω and 0.004Ω respectively. The equivalent resistances referred to high-voltage side and low-voltage side are respectively. ?

A) 2.504Ω and 0.2Ω
B) 0.2Ω and 0.008Ω
C) 0.10016Ω and 2.504Ω
D) 0.008Ω and 0.10016Ω

... Answer is B)
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71. A tank circuit consists of ?

A) an inductor and a capacitor connected in series
B) an inductor and a capacitor connected in parallel
C) a pure inductance and a pure capacitance connected in series
D) a pure inductance and a pure capacitance connected in parallel

... Answer is D)
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72. The instantaneous power of a 1-phase series circuit supplying R-L load from a sinusoidal voltage source has in each cycle ?

A) negative twice, zero four times
B) zero twice, negative once
C) negative four times, zero twice
D) negative twice, zero once

... Answer is A)
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73. In a series R-L-C circuit, the "Q-factor" is given by ?

A) N m
B) R K
C) A S
D) M S

... Answer is A)
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74. In an ac circuit, V = (200 + j 40) V and I = (30 – j 10) A. The active and reactive power of the circuit are respectively ?

A) 6400 W, 800 VAR capacitive
B) 6400 W, 800 VAR inductive
C) 5600 W, 3200 VAR capacitive
D) 5600 W, 3200 VAR inductive

... Answer is B)
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75. Application of Norton's theorem in a circuit results inl ?

A) a current source and an impedance in parallel
B) a voltage cource and an impedance in series
C) an ideal voltage source
D) an ideal current source

... Answer is A)
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76. The voltage (v) vs. current (i) curve of the circuit is shown below: ?

A) 24 Ω
B) 4 Ω
C) 10 Ω
D) 14 Ω

... Answer is D)
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77. Value of the load impedance ZL for which the load consumes maximum power is ZS = 30 + j 40 Ω ?

A) 50Ω at a power factor of 0.6 lead
B) 50Ω at a power factor of 0.6 lag
C) 30Ω at a power factor of unity
D) None of the above

... Answer is A)
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78. The speed-torque characteristic of a D.C. series motor operating from a constant voltage supply is ?

A) N m
B) R K
C) A S
D) M S

... Answer is A)
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79. Match List I (Machine) with List II (Graph) and select the appropriate response. ?

A) N m
B) R K
C) A S
D) M S

... Answer is A)
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80. Three equal impedances are first connected in delta across a 3-phase balanced supply. If the same impedances are connected in star across the same supply ?

A) phase currents will be 3 1 of the previous value
B) line currents will be 3 1 of the previous value
C) Power consumed will be 3 1 of the previous value
D) power consumed will be 3 times the previous value.

... Answer is C)
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81. The average value of the voltage wave v = 110 + 175 sin (314 t – 250) volts ?

A) 110 V
B) 175 V
C) 165.57 V
D) 206.7 V

... Answer is A)
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82. A universal motor is one which ?

A) can ran on any value of supply voltage
B) has infinitely varying speed
C) can operate on A.C. as well as D.C.voltage
D) can work as single-phase or three-phase motor

... Answer is C)
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83. A current from an A.C. source bifurcates into two branches A and B in parallel. Branch A is an inductor with 30 µH inductance and 1Ω resistance. Branch B is another inductor with inductance L and 1.5 Ω resistance. For the ratio of currents in the branches to be independent of supply frequency, value of L should be ?

A) 30.5 µH
B) 20 µH
C) 45 µH
D) 29.5 µH

... Answer is C)
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84. If the centrifugal switch of a single-phase resistance split induction motor does not open after starting of motor, the motor ?

A) will run above normal speed
B) will run below normal speed
C) will draw very small current
D) will draw high current and get over-heated

... Answer is D)
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85. Alternators are usually designed to generate which type of a.c. voltage ?

A) With fixed frequency
B) With variable frequency
C) Fixed current
D) Fixed power factor

... Answer is A)
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86. Three inductors each of 60 mH are connected in delta. The value of inductance of each arem of the equivalent star connection is ?

A) 10 mH
B) 15 mH
C) 20 mH
D) 30 mH

... Answer is C)
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87. The magnetic field energy in an inductor changes from maximum value to minimum value in 5 when connected to an A.C. source. The frequency of the source in Hz is A.C. ?

A) 500
B) 200
C) 50
D) 20

... Answer is C)
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88. A voltage source having an open-circuit voltage of 150 V and internal resistance of 75 Ω, is equivalent to a current source of ?

A) 2 A in series with 75Ω
B) 2 A in parallel with 37.5Ω
C) 2A in parallel with 75Ω
D) 1 A in parallel with 150Ω

... Answer is C)
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89. A 300 kW alternator is driven by a prime mover of speed regulation 4% while the prime mover of another 200 kW alternator has a speed regulation of 3%. When operating in parallel, the total load they can take without any of them being overloaded is ?

A) 500 kW
B) 567 kW
C) 425 kW
D) 257 kW

... Answer is C)
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90. The commutator in a D.C. machine acts as ?

A) a mechanical inverter
B) a mechanical rectifier
C) current controller
D) either (A) or (B)

... Answer is D)
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91. The purpose of using dummy coil in D.C. machines is to D.C. ?

A) eliminate harmonics developed in the machine
B) eliminate armature reaction
C) bring mechanical balance of the armature
D) bring mechanical balance of the body of the motor

... Answer is C)
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92. An inductor with a ferromagnetic core is supplied from a sinusoidal voltage source with frequency 'f'. The current drawn by the inductor will be ?

A) sinusoidal with frequency 'f'
B) sinusoidal with frequency '2f'
C) a sawtooth wave
D) non-sinusoidal with frequency 'f'

... Answer is D)
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93. For a 6-pole D.C. machine with wave wound armature, the number of brushes required is ?

A) 2
B) 4
C) 6
D) 12

... Answer is A)
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94. Function of interpoles in a D.C. machine is to ?

A) reduce field winding heating
B) improve commutation
C) compensate for air-gap variation
D) reduce losses

... Answer is B)
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95. The commutator segments of D.C. machine are made of D.C. ?

A) tungsten
B) hard-drawn copper
C) soft copper
D) electrolytic copper

... Answer is B)
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96. Which one of the following is a speed control method of three-phase squirrel cage induction motor ?

A) Plugging method
B) Star-delta switch method
C) Pole-changing method
D) Centrifugal clutch method

... Answer is C)
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97. In the circuit as shown voltage measured between A, B is found to be 70 V. Value of ?

A) 30 mH
B) 100 mH
C) 200 mH
D) 70 mH

... Answer is A)
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98. Two coupled coils, connected in series, have an equivalent inductance of 16 mH or 8 mH depending on the connection. The mutual inductance between the coils is ?

A) 12 mH
B) 8 2 mH
C) 4 mH
D) 2 mH

... Answer is D)
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99. Tesla is the unit of ?

A) electric flux density
B) magnetic field intensity
C) elelctric field intensity
D) magnetic flux density

... Answer is D)
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100. Which one of the following is a valid value of coefficient of coupling between two inductors ?

A) 1.414
B) 0.9
C) 1.732
D) 17.32

... Answer is B)
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