DMRC Electrical junior engineer exam 2018 second paper

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1. The material used for making shunts for measuring instruments is: ?




... Answer is A)
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2. The resistivity of pure germanium under normal operating conditions is: ?




... Answer is A)
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3. 1 Joule of electrical energy equals: ?




... Answer is A)
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4. Under abnormal operation of an alternator, the over voltages may be reduced using: ?




... Answer is A)
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5. When reverse biased, the width of depletion layer in a PN junction diode: ?




... Answer is A)
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6. The minimum value of current at which a relay operates is called the ?




... Answer is A)
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7. Thevenin's voltage and resistance for the circuit given below are respectively: ?




... Answer is A)
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8. In case of 3 phase induction motor, synchronous speed is: ?




... Answer is A)
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9. Direct current machines are attached with inter-poles in order to: ?




... Answer is A)
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10. The frequency of rotor induced emf, for a line connected 3 phase squirrel cage induction motor, running at a slip of 4% is ?




... Answer is A)
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11. The effective value calculated for half cycle of an alternating quantity is: ?




... Answer is A)
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12. Solid state power supplies are protected from medium surge voltage using: ?




... Answer is A)
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13. While using a clip-on type current transformer, the primary is connected to........... and the secondary is comected to....... ?




... Answer is A)
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14. An extrinsic semiconductor has: ?




... Answer is A)
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15. In common base configuration, the current amplification factor is: ?




... Answer is A)
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16. Induction motor is also known as: ?




... Answer is A)
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17. The function of pole-shoes in a DC machine is: ?




... Answer is A)
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18. The motor having similar construction as that of a DC machine is: ?




... Answer is A)
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19. The impedance of a circuit is given by Z = 3 + j4. Its conductance will be: ?




... Answer is A)
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20. The purpose of moderator in the reactor core of a nuclear power plant is to: ?




... Answer is A)
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21. In a measuring instrument, the torque produced by the measured is called: ?




... Answer is A)
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22. At a pressure of 500 V applied between each live conductor and earth for a period of one minute, the insulation resistance of medium and low voltage installations shall be at least: ?




... Answer is A)
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23. Pentavalent impurity atoms that are added to intrinsic semiconductor are called: ?




... Answer is A)
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24. The type of armature winding used for high current rated DC machine is: ?




... Answer is A)
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25. A 50 Hz current of zero reference has an average value of 45A. Its instantaneous value at an angle of 300 is: ?




... Answer is A)
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26. A moving coil instrument has full scale deflection at 50 mV and 10 mA. The value of shunt resistance required to be connected to convert it into a (0-5A) ammeter is: ?




... Answer is A)
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27. The type of turbine used in hydro-electric plant for a water head range of 70 meter-500 meter is: ?




... Answer is A)
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28. During discharging of a capacitor of C = 1000 µF through a resistance of 1 m? applied with 50 V, the voltage at time constant is: ?




... Answer is A)
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29. In a 3 phase alternator the rotating part is the: ?




... Answer is A)
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30. The impedance of a circuit having v = 120 sin (314t) and current i = 12 sin ? ? ? ? ? ? p 314t - 6 is: ?




... Answer is A)
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31. The frequency of emf generation in India is: ?




... Answer is A)
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32. For the circuit given below, current through 8? is: ?




... Answer is A)
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33. The value of current I for the given circuit is: ?




... Answer is A)
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34. Inductive reactance of a coil may be calculated as : ?




... Answer is A)
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35. SA consumer consumes 600 kWh per day at a load factor of 0.5. Without increasing the maximum demand, if the consumer increases the load factor to 0.8, the consumption of energy in kWh would be: ?




... Answer is A)
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36. For the circuit given below, current through 1? resistance is : ?




... Answer is A)
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37. When a long line is operating at no load, the receiving end voltage is greater than the sending end voltage. This is called the ?




... Answer is A)
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38. In common emitter configuration, the current amplification factor is: ?




... Answer is A)
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39. In case of a DC machine, the value of load current at maximum efficiency is: ?




... Answer is A)
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40. An industrial consumer has a daily load pattern of 4000 kW at 0.8 lag for 10 hrs and 1000 kW unity power factor for 16 hrs. The daily load factor is: ?




... Answer is A)
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41.From the following, identify the diode?




... Answer is A)
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42. The material used for the construction of control rod in a nuclear reactor is: ?




... Answer is A)
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43. . In an RLC series circuit, if the inductive reactance voltage exceeds the capacitive reactance voltage, the reactive component of power will ?




... Answer is A)
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44. DC current flowing through a conductor: ?




... Answer is A)
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45. In case of a purely inductive circuit, the current is maximum when: ?




... Answer is A)
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46. When the fault current is 2000A. for a relay setting of 50% with CT ratio 500/5 the plug setting multiplier will be: ?




... Answer is A)
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47. The pair of donor impurities for semiconductor material is: ?




... Answer is A)
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48. Plant capacity factor of a power plant may be calculated by the formula: ?




... Answer is A)
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49. Magnetic locking of the rotor with stator in case of an induction motor may be reduced by ?




... Answer is A)
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50. An iron cored choke coil when connected to a 15 V DC supply draws a current of 1.5 A. When connected to 230 V, 50 Hz supply, it takes 2A current and consume 60 W. The iron loss in the core is ?




... Answer is A)
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51. The equivalent capacitance of the combination given below is: ?




... Answer is A)
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52. The thickness of stator laminations of a 3 phase induction motor, when eompared to its rotor laminations, is: ?




... Answer is A)
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53. A varistor is made of: ?




... Answer is A)
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54. In case of three phase alternating voltages, various voltages are displaced at an angle of: ?




... Answer is A)
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55. For a synchronous machine ?




... Answer is A)
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56. When an alternator is over-excited, which of the following is true with regard to the reactive power that flows from it ?




... Answer is A)
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57. The effective value of an alternating voltage is its: ?




... Answer is A)
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58. The frequency of instantaneous power in a purely capacitive circuit is: ?




... Answer is A)
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59. The speed of rotating magnetic field of a 3f, 50 Hz slip ring induction motor running at a speed of 960 r.p.m. will be ?




... Answer is A)
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60. The data tabulated for a power system is as follows:
Line voltage = 11 kV, Generated power = 558 kW ,Load power = 443 kW , Load current = 50 A ,The resistance of the power line connected to it is:?




... Answer is A)
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61. At a pressure of 1000 V applied between each live conductor and earth for a period of one minute. the insulation resistance of HV installations shall be at least ?




... Answer is A)
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62. The speed of prime mover for an alternator that is wound for 2 poles at the stator is: ?




... Answer is A)
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63. The test used to locate high-resistance faults in low-resistance conductor circuits is: ?




... Answer is A)
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64. Select the wrong option related to the statement given below: The main characteristic of a series circuit is that: ?




... Answer is A)
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65. The effect of unequal emf in the parallel paths of lap wound armature winding of a DC machine may be neutralised using ?




... Answer is A)
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66. Ripple factor in a full wave rectifier is: ?




... Answer is A)
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67. Impulse turbines are used in: ?




... Answer is A)
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68. In common collector configuration, the current amplification factor is: ?




... Answer is A)
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69. Lightning arrestors connected in power system protect electrical equipment from ?




... Answer is A)
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70. When forward biased, the width of depletion layer in a PN junction diode: ?




... Answer is A)
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71. A forward biased PN junction will act as ?




... Answer is A)
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72. Transformers work on the principle of: ?




... Answer is A)
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73. A revers biased PN junction will act as ?




... Answer is A)
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74. The current supplied by the battery shown below is: ?




... Answer is A)
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75. The pair of acceptor impurities for semiconductor material is: ?




... Answer is A)
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