SSC junior Engineer Exam 2014 Morning

1. The B-H curve for ________will be a straight line passing through the origin. ?

A) hardened steel
B) soft iron
C) air
D) silicon steel

... Answer is C)
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2. Magnetic lines of force coming from a magnet ?

A) intersect at infinity
B) intersect within the magnet
C) cannot intersect at all
D) cancel at pole faces

... Answer is C)
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3. The main advantage of temporary magnets is that we can ?

A) change the magnetic flux
B) use any magnetic material
C) decrease the hysteresis loss
D) magnetize without any source

... Answer is A)
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4. The magnetic material used in permanent magnets is ?

A) iron
B) soft
C) nickel
D) hardened steel

... Answer is D)
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5. Energy stored in an inductor is given by ?

A) 1/2 L(I squre)
B) 2LI
C) LI
D) LI/2

... Answer is A)
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6. A coil with a certain number of turns has a specified time constant. If the number of turns is doubled, its time constant would ?

A) remain unaffected
B) become double
C) become four-fold
D) get halved

... Answer is B)
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7. Hysteresis is the phenomenon in the magnetic circuit by which ?

A) H legss behind B/H
B) B legs behind H/B
C) B and H are always same
D) setting up a constant flux is done

... Answer is B)
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8. The flux through each turn of a 100-turn coil is (t3 –2t)m Wb, where 't' is in seconds, Find the magnitude of the induced emf at t = 2 s. ?

A) 1V
B) 0.8 V
C) 0.4 V
D) 0.2 V

... Answer is A)
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9. A circuit has inductance of 2 H. If the circuit current changes at the rate of 10 A/sec, then selfinduced emf is ?

A) 5 V
B) 0.2 V
C) 20 V
D) 10 V

... Answer is C)
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10. To reduce the cost of the electricity generated ?

A) the load factor and diversity factor must be low
B) the load factor and diversity factor must be low
C) the load factor must be high but diversity factor high
D) the load factor and diversity factor must be high

... Answer is D)
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11. As per recommendation of ISI, the maximum number of points of light, fans and socket outlests ?

A) 8
B) 10
C) 15
D) 20

... Answer is B)
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12. In a 3-pin plug ?

A) All the three pins are of the same size
B) two pins are of the same size but third one is thicker
C) two pins are of the same size but third one is thicker and longer
D) all the three pins are of different sizes

... Answer is C)
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13. The acceptable value of grounding resistance to domestic application is ?

A) 0.1 Ω
B) 1 Ω
C) 10 Ω
D) 100 Ω

... Answer is B)
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14. Inside the earth pit, the earthing electrode should be placed ?

A) vertical
B) horizontal
C) inclined at 45
D) inclined at any angle other than 45

... Answer is A)
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15. The domestic load that has UPF is ?

A) Fan
B) Mixer
C) Tube
D) Filament lamp

... Answer is D)
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16. An industrial consumer has a daily load pattern of 2000 kW, 0.8 P.F. for 12 hours and 1000k W UPF for 12 hours. The load factor is ?

A) 0.5
B) 0.75
C) 0.6
D) 2.0

... Answer is C)
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17. Dielectric loss is proportional to ?

A) [frequency]1/2
B) frequency
C) frequency2
D) frequency3

... Answer is B)
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18. Which of the following application needs frequent starting and stopping of electric motor ?

A) Air-conditioner
B) Lifts and hoists
C) Grinding mill
D) Paper mill

... Answer is B)
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19. The colour of the light given out by a sodium vapour discharge lamp is ?

A) pink
B) bluish green
C) yellow
D) blue

... Answer is C)
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20. The transformer used in a welding set is ?

A) step-up transformer
B) step-down transformer
C) constant current transformer
D) booster transformer

... Answer is B)
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21. The emf induced in a DC shunt generator is 230 V. The armature resistance is 0.1Ω. If the armature current is 200 A, the terminal voltage will be ?

A) 200 V
B) 210 V
C) 230 V
D) 250 V

... Answer is B)
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22. In an autotransformer of voltage ratio 2 1 V V ,V1 > V2, the fraction of power transferred inductively is proportional to ?

A) V1/(V1+V2)
B) V2/V1
C) (V1–V2)/(V1+V2)
D) (V1–V2)/V1

... Answer is D)
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23. Stepped core is used in transformers in order to reduce ?

A) volume of iron
B) volume of copper
C) iron loss
D) reluctance of core

... Answer is B)
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24. Commutation conditions at full load for large DC machines can be efficiently checked by the ?

A) Brake test
B) Swinburne's test
C) Hopkinson's test
D) Field test

... Answer is C)
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25. Which of the following single phase motors is available with speed as low as one revolution per minute ?

A) Shaded pole
B) Reluctance
C) Hysteresis
D) Universal

... Answer is A)
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26. A vacuum cleaner employs______motor ?

A) resistance split phase
B) capacitor start
C) shaded pole
D) single phase series

... Answer is D)
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27. In capacitor start single phase induction motor, the current in the ?

A) supply lines leads the voltage
B) starting winding lags the voltage
C) main winding leads the voltage
D) starting winding leads the voltage

... Answer is D)
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28. The commutator of a DC generator acts as ?

A) an amplifier
B) a rectifier
C) a load
D) a multiplier

... Answer is B)
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29. Fleming's left hand rule is applicable to ?

A) DC generator
B) DC motor
C) Alternator
D) Transformer

... Answer is B)
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30. The potential barrier existing across pn junction ?

A) prevents flow of minority carriers
B) prevents flow of majority carriers
C) prevents total recombination of holes and electrons
D) prevents neutrialisation of acceptor and donor ions

... Answer is C)
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31. In a CE (common emitter) transistor, VCC = 12 V and the zero signal collector current is 1 mA. Determine the operating point when collector load (RC) is 6 kΩ ?

A) 6 V, 1 mA
B) 6 V, 2 mA
C) 12 V, 1 mA
D) 12 V, 2 mA

... Answer is A)
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32. An AC supply of 230 V is applied to half-wave rectifier through transformer of turns ratio 10: 1 as shown in figure. Determine the peak inverse voltage across the diode. ?

A) 37.6 V
B) 32.5 V
C) 23.0 V
D) 14.54 V

... Answer is B)
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33. In a CRO, a sinusoidal waveform of a certain frequency is displayed. The value of the quantity that can be made out by observation is ?

A) RMS value of the sine wave
B) average value of the sine wave
C) form factor of the sine wave
D) peak-peak value of the sine wave

... Answer is D)
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34. In a Cathode Ray Tube, the focussing anode is located ?

A) after accelerating anode
B) between pre-accelerating and accelerating anodes
C) before pre-accelerating anode
D) just after electron-gun

... Answer is B)
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35. The technique of adding a precise amount of time between the trigger point and the beginning of the scope sweep in a CRO is known as ?

A) Free running sweep
B) Delayed sweep
C) Triggered sweep
D) Non-sawtooth sweep

... Answer is B)
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36. Which of the following types of wiring is preferred for workshop lighting ?

A) Casing-Capping wiring
B) Batten wiring
C) Concealed conduit wiring
D) surface conduit wiring

... Answer is C)
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37. The earthing electrodes should be placed within what distance in meters from the building whose installation system is being earthed ?

A) 4
B) 2.5
C) 1.5
D) 0.5

... Answer is C)
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38. upplier's fuse, which is provided in domestic wiring system is ?

A) after the energy meter
B) before the energy meter
C) before distribution board
D) after main switch

... Answer is A)
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39. Power distribution by cable is generally adopted for line length ?

A) less than 10 km
B) above 10 km
C) less than 50 km
D) above 50 km

... Answer is A)
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40. The leakage resistance of a 50 km long cable is 1Ω M. For a 100 km long cable it will be ?

A) 2 M Ω
B) 0.5 M Ω
C) 0.66 M Ω
D) None of these

... Answer is B)
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41. If voltage is increased by 'n' times, the size of the conductor would ?

A) increase by 'n' times
B) reduce by '1/n' times
C) increase by 'n2 ' times
D) reduce by '1/n2 ' times

... Answer is D)
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42. The maximum demand of a consumer is 2 kW and his daily energy consumption is 24 units. His load factor is _______% ?

A) 24
B) 41.6
C) 50
D) 80

... Answer is C)
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43. A wire placed on the top of a transmission line acts as ?

A) phase wire
B) ground wire
C) neutral
D) a transmission wire

... Answer is B)
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44. The conductor, by means of which the metal body of a an equipment or an application is connected to the earth, is known as ?

A) Neutral continuity conductor
B) Earth discountinuity conductor
C) Earth continuity conductor
D) Neutral discontinuity conductor

... Answer is C)
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45. Which insulation is most widely used for covering wires/cables used in internal wiring ?

A) Paper
B) Glass
C) PVC
D) Wood

... Answer is C)
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46. Find RAB for the circuit shown in figure ?

A) 18 Ω
B) 30 Ω
C) 45 Ω
D) 68 Ω

... Answer is A)
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47. For the curcuit shown in figure the voltage across the capacitor during steady state condition is ?

A) 0V
B) 4V
C) 6V
D) 12V

... Answer is D)
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48. A current of 5 mA flows in a resistanceless choke from a 200V alternating source. The energy consumed in the choke is ?

A) 0 J
B) 4.4 J
C) 500 J
D) 1000 J

... Answer is A)
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49. The Q-factor of a parallel resonant circuit is given by ?

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

... Answer is A)
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50. In an R-L series circuit, the phase difference between applied voltage and circuit current will increase if ?

A) XL is decreased
B) R is increased
C) XL is increased
D) Supply frequency is decreased

... Answer is C)
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51. A series circuit has R = 4 Ω XL = 12 Ω and XC = 9 Ω and is supplied with 200 V, 50 Hz. Calculate the power ?

A) 6400W
B) 8000 W
C) 14,400 W
D) 19,200 W

... Answer is A)
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52. Calculate the total susceptance of the circuit shown in figure. ?

A) 6.67
B) 1.87
C) 0.16
D) 0.08

... Answer is D)
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53. In electrodynamometer ammeter , the defkection of the pointer is proportional to ?

A) mean of currents in fixed coil and moving coil
B) square of the current in moving coil
C) RMS value of current in fixed coil
D) mean-square of currents in fixed coil and moving coil

... Answer is D)
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54. In which of the following transformers, is the secondary winding always kept closed ?

A) Current transformer
B) Potential transformer
C) Power transformer
D) Distribution

... Answer is A)
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55. Two holes are drilled in the disc on a diameter of energy-meter to ?

A) increase ventilation
B) reduce the weight of disc
C) eliminate creeping on no-load
D) increase deflecting torque

... Answer is C)
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56. Which of the following instruments has the highest torque/weight ratio among the given instruments ?

A) Attraction type MI instrument
B) Electrodynamometer instrument
C) Repulsion type MI instrument
D) Permanent magnet moving coil instrument

... Answer is B)
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57. Two sinusoidal currents are given by the equations i1 = 50 sin       + 4 π ωt and i2=25 sin       − 6 π ωt. The phase difference between them is_____degrees. ?

A) 15
B) 30
C) 45
D) 75

... Answer is D)
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58. A supply voltage of 230 V, 50 Hz is fed to a residential building. Write down its equation for instantaneous value. ?

A) 1Ω
B) infinite
C) 0.5 Ω
D) zero ohms

... Answer is B)
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59. A supply voltage of 230 V, 50 Hz is fed to a residential building. Write down its equation for instantaneous value. ?

A) 163 sin 314.16t
B) 230 sin 314.16t
C) 325 sin 314.16t
D) 361 sin 314.16t

... Answer is C)
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60. The AC bridge used for measurement of dielectric loss of capacitor is ?

A) Anderson bridge
B) Schering bridge
C) Wien bridge
D) Hay's bridge

... Answer is B)
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61. A resistance R is measured by ammeter-voltmeter method. The voltmeter reading is 200 V and its internal resistance is 2 K Ω If the ammeter reading is found to be 2 A, then value of R is ?

A) 105.3Ω
B) 100.0Ω
C) 95.3Ω
D) 90.3Ω

... Answer is A)
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62. The circuit shown in the given figure is equivalent to a load of ?

A) 4/3 Ω
B) 8/3 Ω
C) 4 Ω
D) 2 Ω

... Answer is A)
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63. The north pole of a magnet is moved away from a metallic ring. The induced current in the ring flows ?

A) clockwise
B) anticlockwise
C) first anticlockwise and then clockwise
D) first clockwise and then anticlockwise

... Answer is B)
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64. For the linear circuit shown in figure. when R = ∞, V = 20 V; when R = 0, I = 4 A; when R = 5 Ω, the current I is ?

A) 1A
B) 2A
C) 3A
D) 4A

... Answer is B)
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65. The current I in the circuit shown in the figure is ?

A) –3.67 A
B) -10/7 A
C) 4A
D) 6A

... Answer is B)
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66. In the network shown in the figure, the value of RL such that maximum possible power will be transferred to RL is ?

A) 5.76 Ω
B) 6.0 Ω
C) 10.0 Ω
D) 15.0 Ω

... Answer is B)
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67. A 200 W, 200 V bulb and a 100 W, 200 V bulb are connected in series and the voltage of 400 V is applied across the series connected bulbs. Under this condition 200 W, 200 V ?

A) 100 W bulb will be brighter than 200 W bulb
B) 200 W bulb will be brighter than 100 W bulb
C) Both the bulbs will have equal brightness
D) Both the bulbs will be darker than when they are connected across rated voltage

... Answer is A)
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68. In the network shown, if one of the 4 Ω resistances is disconnected, when the circuit is active, the current flowing now will ?

A) increase very much
B) decrease
C) be zero
D) increase very slightly

... Answer is B)
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69. For the circuit shown in figure, when VS = 0, I = 3A. When VS = 200 V, what will be the value of I ?

A) – 4A
B) – 1A
C) 1 A
D) 7 A

... Answer is B)
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70. The unit of volume resistivity is ?

A) Ohm-m3 /m2
B) ohm-m2 /m
C) ohm-gram-m/gram
D) ohm-m4 /m3

... Answer is A)
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71. Four resistances 2Ω, 4Ω, 5Ω, 20Ω are connected in parallel. Their combined resistance is ?

A) 2Ω
B) 4Ω
C) 1Ω
D) 5Ω

... Answer is C)
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72. In the figure, the value of R is ?

A) 2.5 Ω
B) 5.0 Ω
C) 7.5 Ω
D) 10.0 Ω

... Answer is C)
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73. Power consumed in the given circuit is ?

A) 100 watts
B) 5 watts
C) 20 watts
D) 40 watts

... Answer is B)
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74. For the network shown in the figure, the value of current in 8 Ω resistor is ?

A) 4.8A
B) 2.4A
C) 1.5A
D) 1.2A

... Answer is B)
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75. A piece of oil soaked paper has been inserted between the plates of a parallel plate capacitor. Then the potential difference between the plates will ?

A) increase
B) decrease
C) remain unaltered
D) become zero

... Answer is B)
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76. The current drawn by a tungsten filament lamp is measured by an. ammeter. The ammeter reading under steady state condition will be _______ the ammeter reading when the supply is switched on. ?

A) same as
B) less than
C) greater than
D) double

... Answer is B)
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77. Tesla is same as ?

A) Weber/meter
B) Weber(meter)2
C) Farad/meter
D) Henry/(meter)2

... Answer is B)
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78. A stove element draws 15 A when connected to 230 V line. How long does it take to consume one unit of energy ?

A) 3.45h
B) 2.16 h
C) 1.0 h
D) 0.29 h

... Answer is D)
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79. The Req for the circuit shown in figure is ?

A) 14.4 Ω
B) 14.57Ω
C) 15.27 Ω
D) 15.88 Ω

... Answer is A)
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80. The SI unit of conductivity is ?

A) ohm-m
B) ohm/m
C) mho-m
D) mho/m

... Answer is D)
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81. Calculate the voltage drop across 14.5 Ω resistance. ?

A) 14.5V
B) 18 V
C) 29 V
D) 30.5 V

... Answer is C)
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82. If the excitation of an alternator operating in paralledl with other alternator is increased above the normal value of excitation, its ?

A) Power factor becomes more lagging
B) Power factor becomes more leading
C) Output current decreases
D) output kW decreases

... Answer is A)
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83. In an alternator, the effect of armature reaction is minimum at power factor of ?

A) 0.5 lagging
B) 0.866 lagging
C) 0.866 leading
D) unity

... Answer is D)
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84. Damper winding in synchronous motors is used to ?

A) suppress hunting
B) improve power factor
C) develop reluctance torque
D) improve the efficiency

... Answer is A)
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85. Turbo alternators have rotors of ?

A) small diameter and long axial length
B) large diameter and long axial length
C) large diameter and small axial length
D) small diameter and small axial length

... Answer is A)
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86. Which of the following equipments is used to limit short-circuit current level in a sub-station ?

A) Isolators
B) Lightning switch
C) Series reactor
D) Coupling capacitor

... Answer is C)
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87. At starting the current through the starting winding (IS) of single phase induction motor ?

A) legs 'V' by 900
B) leads 'V' by 900
C) is nearly in phase with 'V'
D) leads 'V' by 750

... Answer is C)
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88. In a single phase induction motor at start, the two revolving fields produce ?

A) unequal torques in the rotor conductors
B) no torque in the rotor conductor
C) equal and opposite torques in the rotor conductors
D) equal torques in same direction in the rotor conductros

... Answer is C)
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89. A synchronous motor car be used as synchronous condenser when it is ?

A) over excited
B) over loaded
C) under excited
D) under loaded

... Answer is A)
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90. Which one of the follwing method would give a higher than actual value of regulation of an alternator ?

A) ZPF method
B) MMF method
C) EMF method
D) ASA method

... Answer is C)
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91. In a single phase induction motor, speed sensitive centrifugal switch is connected in______winding ?

A) parallel with main
B) series with main
C) parallel with starting
D) series with starting

... Answer is D)
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92. The multiplying power of the shunt of a milli ammeter is 8. If the circuit current is 200 mA. then current through the meter is ?

A) 25 mA
B) 200 mA
C) 1600 mA
D) 3200 mA

... Answer is A)
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93. If current through the operating coil of a moving iron instrument is doubled, the operating force becomes ?

A) one and a half times
B) 2 times
C) 3 times
D) 4 times

... Answer is D)
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94. In moving iron instruments, the iron moves in a direction to cause ?

A) coil inductance to be constant
B) mutual inductance to be constant
C) minimum reluctance path
D) decrease in the flux passing through it

... Answer is C)
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95. A moving coil instrument has a resistance of 10 Ω and gives full scale deflection at 0.5 V potential difference across it. How can it be adapted to measure a current upto 100A ?

A) By connecting shunt resistance of 0.005 Ω across the meter
B) By connecting shunt resistance of 0.05Ω across the meter
C) connecting shunt resistance of 5 Ω across the meter
D) By connecting shunt resistance of 10Ω across the meter

... Answer is B)
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96. Low voltage windings are placed nearer to the core in the case of concentric windings because ?

A) it reduces hysteresis loss
B) it reduces eddy current loss
C) it reduces insulation requirement
D) it reduces leakage fluxes

... Answer is C)
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97. If K is the phase-to-phase voltage ratio, then the line-to-line voltage ratio in a 3–phase, Star-Delta transformer is ?

A) K
B) K/ √3
C) √3 K
D) √3/K

... Answer is C)
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98. The material to be used in the manufacture of a standard resistor should be of ?

A) low resistivity
B) high resistivity and low temperature coefficient
C) high temperature coefficient
D) low resistivity and high temperature coefficient

... Answer is B)
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99. In a 3–phase induction motor crawling happens at ?

A) any speed
B) no-load speed
C) odd multiples of fundamental
D) even multiples of fundamental

... Answer is C)
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100. A 4–pole, 3phase induction motor runs at 1440 rpm on a 50 Hz supply, Find the slip speed. ?

A) 2940 rpm
B) 1500 rpm
C) 1440 rpm
D) 60 rpm

... Answer is D)
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