HPSSC-JE(ELECTRICAL) Post code- 715|| TECHNICAL PAPER Solution||
ELECTRICALGENIE
1. A current of 2.0 A passes through a cell of e.m.f 1.5 V having internal
resistance of 0.15 ohms. The potential difference across the terminals of the
cell is :
2. The power consumed by a coil is 300 W when connected to a 30 V DC
source and 108 W when connected to a 30 V AC source. The reactance of
coil is :
3. With increase in supply frequency, the dielectric loss in a material will
4. A parallel circuit is said to be in resonance when the admittance is purely :
5. Specific resistance of a conductor depends upon :
6. Piezoelectric effect is generally observed in :
7. Which of the following inductors will have the least eddy current losses ?
8. A single phase transformer when supplied from 220 V, 50 Hz has eddy
current loss of 50 W. If the transformer is connected to a voltage of 330 V,
50 Hz, the eddy current loss will be :
9. The phasor diagram of a transformer on load can be drawn only if we know :
10. If the percentage resistance of a power transformer for secondary side is
2.5 % and turn ratio is 1:10, the percentage secondary resistance referred to
primary will be :
11. The transformer efficiency will be maximum at a power factor of
12. The all day efficiency of a distribution transformer will be high with :
13. In a power transformer, the breather is provided in order to :
14. The most essential condition for parallel operation of two single phase
transformers is that they should have the same :
15. In a DC motor, the windage loss is proportional to :
16. Laminated yoke in a DC motor can reduce :
17. A 04 pole DC generator with 16 coils has two layer lap winding. The pole
pitch is :
18. Determine the flux per pole for 06 pole DC machine having 240 wave
connected conductors which generates an open circuit voltage of 500 V
while running at 1000 RPM.
19. The current drawn by a 220 V DC motor of armature resistance 0.5 ohms
and back e.m.f 200 V is :
20. The direction of rotation of a DC motor can be determined by :
21. A 400 V DC shunt motor takes 5 A at no load. Armature and field resistance
of motor are 0.5 ohms and 200 ohms respectively. What is the ratio of speed
from full load to no load when DC shunt motor takes 50 A on full load ?
22. The torque-speed characteristics of a DC shunt motor is :
23. For efficient operation of DC shunt motor, the additional resistance inserted
in the armature should be :
24. The field system of an alternator is usually excited at :
25. The angle between induced e.m.f and terminal voltage on no load for a
single phase alternator is
26. Power factor of an alternator driven by constant speed prime mover can be
changed by changing its :
27. In a 03 phase synchronous motor, the magnitude of field flux :
28. A leading power factor load on an alternator implies that its voltage
regulations shall be :
29. In a 03 phase synchronous motor, the magnitude of back emf set up in the
stator depends on :
30. A 03 phase synchronous motor is widely used for :
31. In a hysteresis motor, the rotor case must have :
32. What is the material of slip rings in an induction machine ?
33. The maximum possible speed of a 03 phase squirrel cage induction motor
running at a slip of 4 % is :
34. What is the frequency of rotor current of a 50 Hz induction motor operating
at 2 % slip ?
35. The power factor of 03 phase induction motor is likely to be maximum
when it will operate at :
36. The advantage of double squirrel cage induction motor over single cage
motor is that its :
37. Capacitor in a single phase induction motor is used for :
38. ACSR conductor have
39. The sag of the conductors of a transmission line is 2.5 mtrs when the span is
250 mtrs. Now, if the height of supporting tower is increased by 25%, the
sag will :
40. 100 % string efficiency means :
41. Which of the following results in a symmetrical fault ?
42. IDMT relays are used to protect the power transformers against :
43. DC series motors are very suitable for heavy duty applications such as
electric railways rolling mills because of :
44. A domestic mixer uses which motor ?
45. The temperature inside a furnace is usually measured by
46. Resolution of an instrument is :
47. The scale of an electrodynamometer usually reads the :
48. Which displacement transducer is used for accurate and linear
measurement ?
49. Early effect in a bipolar junction transistor is caused by
50. To obtain very high input and output impedance in a feedback amplifier, the
topology mostly used is :
51. An ideal OP-AMP is an ideal :
52. A Zener diode when used in voltage stabilisation circuits, is biased in
53. The output of a logic gate is “1” when all its inputs are at logic “0”. The gate is :
54. The logical expression Y = A + Ā B
55. Which of the following cannot be an input that is given to the PLC ?
56. Consider the given circuit. In the circuit, the race around :
57. A modern power semiconductor device that combines the characteristics of
BJT and MOSFET is called :
58. A thyristor has a PIV of 650 V, the voltage safety factor is 2, then the
voltage upto which the device can be operated is given by :
59. TRIACs can not be used in AC voltage regulator for a/an
60. A power chopper converts :
61. An SCR has half cycle surge current rating of 3000A for 50 Hz supply. One
cycle surge current will be
62. A single phase full bridge inverter can be operated in load commutation
mode in case load consists of
63. If holding current of a thyristor is 2mA, then latching current should be
64. Thyristor can be protected from over voltages by using
65. Typical range of thyristor turn-off time is
66. Latches are circuits which are
67. If a hexadecimal no. needs to be converted into binary. For each
hexadecimal digit, there will be how many bits ?
68. A.Ā is equal to
69. Truth table is used to express
70. How the digital signals are transmitted through a single conductor ?
71. Which network protocol is used to send E-mail ?
72. Another term for main memory is
73. In the left hand rule, fore finger always represents
74. The change of cross-sectional area of conductor in magnetic field will affect
75. The lines of force due to charged particles are
76. Which material/compound behave like perfect insulator at low temperatures
and conductor at high temperature ?
77. The number of orbiting electrons in germanium atom are
78. Without a DC source, a clipper acts like a
79. Class-B amplifier is biased
80. Five Capacitors each of 5F are connected in series, the equivalent
capacitance of the system will be
81. If P is the power of a Star connected system, then what will be the power of
an equivalent Delta connected system ?
82. Which of the following has no units ?
83. Skin effect occurs, when a conductor carries current at
84. For symmetrical waveform, average value of one full cycle is
85. Bundled conductors in EHV transmission lines
86. Skin effect depends upon
87. Water hammering occurs in
88. For harnessing low variable water heads, the suitable hydraulic turbine with
reaction and adjustable vanes is
89. Ideal value of voltage regulation of a device is
90. Hydro generators are generally employed to run at
91. An induction motor and synchronous motor are connected to a common
feeder line. To operate the feeder line at unity power factor the synchronous
motor should be
92. A wound rotor induction motor can be distinguished from squirrel cage
induction motor by
93. If an induction motor is operating at 60% of its synchronous speed, the
maximum efficiency under ideal conditions (theoretically possible) is
94. Horizontally mounted moving iron instruments employ
95. A (0-250V) Voltmeter has a guaranteed accuracy of 2% on full scale
reading. What is the percentage error if it measures 150V ?
96. A spring controlled moving iron voltmeter draws a current of 1mA for full
scale value of 100V. If it draws a current of 0.5mA, the meter reading is
97. The deflecting torque of a moving iron instrument is
98. The measured value of a resistance is 10.25ohm, whereas its value is 10.22ohm.
What is absolute error of the measurement ?
99. Air exhibits
100. The best variety of copper from the point of view of electrical conductivity is
101. The converse of magnetostriction effect is
102. There is no hole current in good conductors because they
103. The measurement of which one of the following will reveal the sign of
charge carriers ?
104. Branch circuit must not feed more than _______ points.
105. What is meant by contingencies ?
106. The cheapest system of internal wiring is
107. The thickness of insulation provided on the conductor depends
108. Which of the following is not used as earth continuity conductor ?
109. In case of fluorescent tube if only the ends of the tubes remain lighted, it
indicates that
110. The fluorescent tube in comparison to tungsten filament lamp has the
advantage of
111. The inductive reactance of a transformer depends upon
112. The supply frequency usually employed for high frequency eddy current
heating is
113. The power required for electro-deposition is
114. Eureka is an alloy of
115. Non-consumable electrodes are made of
116. Voltage required for Butt welding is
117. Power factor of a Power Transformer on no-load will be
118. Transformer will operate at maximum efficiency when
119. On no-load phasor diagram of transformer, the core loss component of the
current remains in phase with
120. Which of the following losses is/are for short circuit test on a transformer ?
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