HPSSC-JE(ELECTRICAL) Post code- 580|| TECHNICAL PAPER Solution||
ELECTRICALGENIE
1. The ratio of the primary to secondary voltage of a transformer is 2 : 1. The
saving in terms of weight of copper required if an autotransformer is used
instead of two winding transformer will be
2. Cooling of transformers is necessary to
3. The all day efficiency of a transformer is the ratio of
4. For satisfactory parallel operation of two single phase transformers a
number of conditions are to be fulfilled. A number of conditions are written
below. Indicate which of these is not required to be fulfilled.
5. A 400V, 50-Hz three phase induction motor rotates at 1440 rpm on fullload. The motor is wound for
6. The relation between synchronous speed, stator supply frequency and stator
number of poles of a three phase induction motor is given by
7. Torque developed by a three phase, 400 V induction motor is 100 N-m. If
the applied voltage is reduced to 200 V, the developed torque will be
8. For a three phase induction motor having rotor circuit resistance of 6 ohm,
maximum torque occurs at a slip of 0.6. The value of standstill rotor circuit
reactance is
9. The phenomenon of squirrel cage motors some time showing a tendency to
run at a very low speed is known as
10. A 5 H-hp, three phase, 400 V star connected squirrel cage induction motor
meant to drive a milling machine, at starting takes about
11. The starting torque of an induction motor can be increased by
12. The span for full-pitch coil wound for six poles is
13. The armature flux opposes the main field flux when load power factor is
14. A commercial alternator has
15. In alternator damper windings are used to
16. The magnitude of the resultant magnetic field produced by a three phase
current flowing through a three phase winding is equal
17. Pitch factor for 5/6 short pitch coil is
18. Armature Reaction in a electrical machine is the effect of :
19. The speed regulation of a Synchronous motor is
20. The direction of the rotation of an ordinary shaded pole single phase
induction motor
21. In a single phase repulsion motor, torque is developed on the rotor when the
brush axis is fixed
22. A D.C. series motor when connected across an A.C. supply will
23. The armature of a D.C. machine is made up of laminated sheets to
24. The function of a brush and commutator arrangement in a d.c. motor
25. The armature winding of a d.c. machine is made up of a number of coils
distributed in a large number of armature slots instead of placing all the
coils in two slots to
26. The maximum permissible operating temperature of class-E insulating
material is
27. The number of parallel paths in the armature winding of a four pole wave
connected dc machine having 22 coil-sides is
28. The direction of rotation of a dc motor can be reversed
29. To have sparkless commutation the armature reaction effect in a d.c.
machine is neutralised by
30. Which type of motor is preferred for traction work ?
31. A solid angle is expressed in terms of
32. The colour of sodium vapour discharge lamp is
33. Glare is reduced by
34. In induction heating which of the following is high ?
35. The electrodes used for direct resistance heating are made of
36. In which type of welding, current is passed through the metal pieces to be
joined ?
37. In transmission line sag depends upon
38. Electroplating is the process of
39. Which of the following motor is used in household refrigerators ?
40. Voltage regulators are used to ________ the voltage.
41. The direct current system employed for tramways operates on
42. Low frequency operation of overhead line in traction system
43. In electrolytic process, the electrical energy is converted into
44. Ajax wyatt furnace is started when
45. The output of full wave rectifier contains
46. Which of the following has negative temperature co-efficient ?
47. A wire of resistance R has its length and area of cross-section doubled, its
resistance becomes
48. The unit of retentivity is
49. Which material has least specific resistance ?
50. In an a.c. circuit, M.I. meters measure
51. Economisers are used to heat
52. A coil has 1000 turns and current of 8 amp. causes a flux of 5 milli-weber to
it. The inductance of coil will be
53. Internal resistance of dry cell is
54. Power factor of incandescent lamp is
55. Bronze is an alloy of
56. Suitable turbine used for harnessing tidal power is
57. Advantage of hydropower over thermal power is
58. Impedance relay can be used for
59. For energy efficient motors, which of the following is correct ?
60. One of the main application of magneto-resistor
61. Input impedance of an ideal Op-Amp is
62. In transistor with normal bias, the emitter junction
63. For the binary number 11101000, the equivalent hexadecimal number is
64. In 2’s compliment form, –2 is
65. The most commonly used logic family is
66. ALE stands for
67. The number of terminals in an SCR is
68. A relaxation oscillator uses
69. In overhead lines, we generally use
70. The electric power can be transmitted by
71. Which variety of copper has the best conductivity ?
72. Basic ceramic material is
73. Which of the following insulating materials has the highest safe working
temperature ?
74. Thermocouple works on
75. In a commutator
76. An electric boiler draws 12 A at 115 V for a period of 6 hours. If the electrical
energy costs 30 paisa per kWh, then cost of boiler operation in ` is
77. A 100 W, 250 V bulb is put in series with a 40 W, 250 V bulb across 500 V
supply. The total resistance offered by both the bulbs in the circuit in ohm is
78. When a source is delivering maximum power to the load, the efficiency will be
79. A 12 V lead acid battery used in a car contains
80. The force per metre length between two conductors 0.05 m apart carrying
1000 A and 5000 A is
81. What will be the current passing through the ring shaped air cored coil when
the number of turns is 800 and ampere-turns are 3200 ?
82. In R-L-C series circuit at resonant frequency, the voltage across the
resistance is
83. An alternating voltage of (160+j120)V is applied to a circuit and the current
in the circuit is given by (6+j8)A. The value of the circuit impedance in ohm
is given by
84. A resistor R in series with a capacitor C is connected to a 50 Hz, 240 V
supply. The resistor absorbs 300 W at 100 V. The voltage across the
capacitor is
85. An alternating current is represented by i=70.7 sin 520t. Then the value of
frequency in Hz is
86. The eddy current power loss in a magnetic material can be expressed as
87. A battery of 50 cells in series is charged through a resistance of 4 ohm from
a 230 V supply. If the terminal voltage per cell is 2 V and 2.7 V respectively
at the beginning and at the end of the charge. The charging current at the
beginning is given by
88. The power in the wind Pw through a given cross-sectional area for a uniform
wind velocity V is
89. Which of the following statement is correct ?
90. Which of the following circuit breaker has high reliability and minimum
maintenance ?
91. The differential relaying system respond to
92. . To protect the power transformer (delta-star) against internal faults the
current transformer will have
93. For a 400 kV line the spacing between phase conductors is around :
94. Bundle conductors are used to
95. The power factor of a system on a 460 V, 3 phase, 60 Hz, in which the
ammeter indicates 10 V and the wattmeter reads 62 kW will be
96. Which of the following protects the underground cables against mechanical injury ?
97. The thermal efficiency of a steam power station is
98. Which of the following is not a secondary source of energy ?
99. Pelton wheel is which type of turbine ?
100. A generating station has a maximum demand of 35,500 kW and has
connected load of 6500 kW. The number of units generates are annually
25.6 * 107. The demand factor is
101. The principle of dynamically induced emf is utilized in :
102. Which of the following is not a part of DC machine ?
103. A 4 pole generator with 16 coils has a two layer lap winding, the pole pitch
is
104. The current drawn by a 120 V DC motor with back emf of 110 V and
armature resistance of 0.04 ohms is
105. The output indicated on the name plate of any motor is always the
106. When voltage is transformed from primary to secondary then it is _______ .
107. At 50 Hz operation a single phase transformer has hysteresis loss 200 W and
eddy current loss of 100 W. Its core loss at 60 Hz frequency operation will
be :
108. A three phase induction motor with rotor circuit open will
109. A three phase 6 pole, 50 Hz induction motor is running at 5% slip. What is
the speed of the motor ?
110. The starting torque of an induction motor varies as :
111. The two bright and one dark lamp method is used for
112. Capacitor start capacitor run motors are used in
113. Which part of transformer is subjected to maximum heating ?
114. Open circuit test in a transformer is performed with
115. The current from the stator of an alternator is taken out to the external load
circuit through
116. In rotor resistance control method, _______ with the increase in speed.
117. The stator winding of a single phase induction motor is splitted into two
parts in order to
118. The cheapest system of interval wiring is ________ wiring.
119. The rating of fuse wire is always expressed in
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