| Post Name | Electrician/Lineman |
|---|---|
| Question Paper Code | 121/2025 |
| Category Code | 045/2024, 197/2024, 436/2024, 594/2024, 746/2024 |
| Date of Test | 26 September 2025 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The resistance of copper wire to the flow of current through it :
Answer
Question Cancelled
2
Which of the following material possesses least resistivity?
Answer
B. Silver
3
Temperature coefficient of a conductor is defined as the
Answer
D. Increase in resistance per ohm per degree centigrade
4
Which of the lamp has more resistance?
Answer
D. 25W 250V lamp
5
The curve representing ohms law is
Answer
A. Linear
6
The conductivity of insulators :
Answer
C. Very low
7
If a 220 V heater is used on 110 V supply, heat produced by it will be as much :
Answer
A. One-fourth
8
The coulomb is a unit of
Answer
B. Quantity of electricity
9
Which of the following wires has the greatest cross-sectional area?
Answer
A. 8 SWG
10
A metallic sheath is provided over the insulation to protect the able from
Answer
C. Moisture
11
According to Ohmβs Law, the relation between resistance, current and voltage is stated
as :
Answer
D. I = V/R
12
Which is inversely proportional to the resistance of a conductor?
Answer
B. Area of cross section
13
Which material is having negative temperature co-efficient of resistance?
Answer
C. Mica
14
Which law states that in closed electric circuit, the applied voltage is equal to the sum of
the voltage drops?
Answer
A. Kirchhoffβs second law
15
What is the effect of electric current on battery charging?
Answer
B. Chemical effect
16
Which is used as a positive electrode in a dry cell?
Answer
C. Carbon
17
What is the name of defect that bending of plates in secondary cells?
Answer
A. Buckling
18
Five cells are connected in a parallel combination with an emf of 2V each. The output
voltage is
Answer
D. 2V
19
Why the vent plug is kept open during charging of a battery?
Answer
C. To escape the gas freely
20
Sedimentation in lead acid batteries occures due to
Answer
D. Over charging at high rate
21
What will be the inductance when the iron of an iron cored coil is removed to make it as
air cored coil?
Answer
B. Less
22
What is the S.I. unit of Flux density?
Answer
A. Tesla
23
What is the similar term in magnetic circuit for βconductanceβ in electrical circuit?
Answer
B. Permeance
24
The magnitude of force acting on a current carrying conductor placed in a magnetic field
is independent of
Answer
C. Cross sectional area of conductor
25
What is the unit of Magneto Motive Force (MMF) ?
Answer
C. Ampere - turns
26
Which factor affects the polarity of the electromagnet?
Answer
B. Direction of current
27
Which is the cause for changing the permeability?
Answer
B. Flux density
28
What is the effect on surrounding metal placed in a magnetic field?
Answer
C. Eddy current
29
The area of Hysteresis loss is a measure of :
Answer
D. Energy loss
30
Iron loss is known as :
Answer
C. Both
31
The unit of frequency is :
Answer
C. Hertz
32
The effective value of an alternating current can be calculated by :
Answer
A. I = 0.707 Iβ
33
Value of form factor for an alternating current is :
Answer
D. 1.11
34
In pure inductive circuit value of power factor is :
Answer
B. 0
35
The equation for capacitive reactance of an alternating-current circuit is:
Answer
A. Xκ = 1/(2Οfc)
36
Method used for reducing the earth electrode resistance is :
Answer
C. connecting a number of earth electrodes in parallel
37
Power factor of an alternating current circuit is :
Answer
D. R
Z
38
In alternating current circuit reactive power is :
Answer
B. P = VI sin ΞΈ
39
In an alternating current circuit of frequency 50 Hz time period is :
Answer
C. 0.02
40
In power triangle for alternating current circuit :
Answer
A. VA = β(WΒ² + VARΒ²)
41
Which rule is used to find the direction of induced emf in DC generator?
Answer
C. Flemingβs right hand rule
42
Which type of DC generator works in absence of residual magnetism?
Answer
D. Separately excited generator
43
EMF equation of DC generator is
Answer
Question Cancelled
44
In EMF equation A denoted for
Answer
A. No. of parallel path in armature
45
Combination of series field and shunt field within one generator is
Answer
C. Compound generator
46
What is the purpose of compensating winding in DC generator?
Answer
B. Neutralizes demagnetizing effect
47
No-load speed of which of the following motor will be highest?
Answer
C. Series
48
Which type of DC motor used for constant speed drives?
Answer
D. DC shunt motor
49
Which speed control method offers below normal speed in DC shunt motor?
Answer
A. Armature control method
50
Why the holding coil of a 3 point starter is connected in series with shunt field?
Answer
D. To protect the motor from high speed
51
On which factor the direction of rotation of 3 phase motor rotor depends?
Answer
B. Phase sequence of supply to stator field
52
Torque of 3 phase induction motor depends up on the :
Answer
C. Rotor resistance
53
In a double squirrel cage motor, the inner cage bars made up of :
Answer
D. Low resistance metals like copper
54
Slip of motor, S =
Answer
C. (NS β NR) / NS
55
What are the factors depends upon the synchronous speed of 3 phase motor?
Answer
B. Supply frequency and number of stator poles
56
If the capacitor in capacitor type fan is shorted the fan will :
Answer
D. Not run
57
A thermal over load relay is provided in a starter to protect the motor against :
Answer
C. Excess current
58
Capacitor start and capacitor run motors are used in
Answer
D. Refrigerators
59
What is the function of centrifugal switch in an induction motor?
Answer
B. To disconnect the starting winding
60
The rotor current frequency in a slipring induction motor depends on :
Answer
C. Amount of slip
61
Which of the following statement is not true for dynamometer type wattmeter?
Answer
D. The scale is ununiform
62
In two wattmeter method of power measurement the reading of one wattmeter is zero
and other reads the total power, then the power factor will be :
Answer
B. Equal to 0.5
63
Which of the following statement is/are correct for permanent magnet moving coil
instrument?
(1) The scale of the permanent magnet moving coil instrument is uniform
(2) The deflecting torque of a permanent magnet moving coil instrument is directly
proportional to the current passing through the coil.
(3) PMMC instrument used for measuring both DC and AC values
Answer
A. Both (1) and (2)
64
How many segments are available in LED display format of digital multimeter?
Answer
C. 7
65
What is the principle of dynamometer type Instrument?
Answer
A. DC motor principle
66
The capacity of Transformers are always rated by its :
Answer
A. Apparent power
67
Where the oil level indicator is typically fitted in distribution transformers?
Answer
B. Conservator tank
68
What is ratio of composition of Steel and silicon in transformer Core?
Answer
B. 3% Silicon and 97% steel
69
What is the major disadvantage of an auto transformer?
Answer
D. Does not isolate the secondary from primary circuit.
70
What is the purpose of explosion vent in power transformer?
Answer
C. Pressure releasing
71
The range of visual spectrum is :
Answer
D. 380 nm - 780 nm
72
The avalanche breakdown primarily depends on the phenomenon of :
Answer
C. Collision
73
Which factor increase the performance of LED light?
Answer
D. Thermal management
74
What is the full form of the abbreviation COB?
Answer
A. Chip on Board
75
Which term is related to the information about hue and saturation of a colour?
Answer
C. Chrominance
76
The forbidden energy gap for germanium is :
Answer
C. 0.72 eV
77
The valencies of Phosphorus and Silicon materials are :
Answer
Question Cancelled
78
Which of the following will serve as a donor impurity in silicon?
Answer
D. Antimony
79
Which of the following diode show negative resistance region?
Answer
B. Tunnel diode
80
The most heavily doped region in a transistor is :
Answer
C. Emitter
81
In hydro-electric power plant Pelton wheel is used for :
Answer
A. high head
82
Which of the following is a non-conventional type of power generation?
Answer
D. tidal power plant
83
Which device heats the feedwater on its way to boiler by deriving the heat from the flue
gas in steam power plant?
Answer
B. economiser
84
Which device senses the wind speed in a windmill?
Answer
A. Turbine controller
85
What is the function of condenser in steam power plant?
Answer
C. Both
86
A dam-like structure built across the entrance of gulf in tidal power plant is known as :
Answer
C. Barrage
87
Which of the following statement is /are correct?
(i) Cadmium is used as control rod in nuclear reactor.
(ii) The moderator slows down the neutrons before they bombard the fuel rods in
nuclear reactor.
(iii) In heat exchanger nuclear fuel is subjected to nuclear fission.
Answer
C. Both (i) and (ii)
88
What is the function of surge tank in hydro-electric power plant?
Answer
D. To limit the abnormal pressure in the penstock
89
Which of the following statement is / are correct?
(i) The top surface of solar cell consist of an extremely thin layer of P-type material.
(ii) Solar modules uses photons in the sunlight to produce DC electricity.
(iii) The unit of solar Irradiance is volt per square metre.
Answer
A. Both (i) and (ii)
90
Heat produced by 1 kg of nuclear fuel is equal to that produced by :
Answer
A. 2750 Ton of coal
91
From which element in distribution system the tapings are taken for giving electric
supply to the consumers :
Answer
A. Distributor
92
Why the voltage of the electric supply is stepped up using transformer for long distance
AC transmission?
Answer
D. Higher voltage will make the cost of supply cheaper
121/2025 13 A
93
Which statement is correct about AC and DC transmission?
(i) There is no skin effect in DC transmission
(ii) There is no skin effect in AC transmission
(iii) Due to skin effect, more copper is required in AC transmission.
Answer
C. Both Statement (i) and (iii) are correct
94
Which insulator is used for mounting drop out fuses?
Answer
D. Post insulator
95
What is the full form of ACSR?
Answer
B. Aluminium Conductor Steel Reinforced
96
Upto which voltage, pin type insulators are used?
Answer
C. 33 kv
97
What is the minimum clearance between live wires on the same side of support in
horizontal configuration of conductors?
Answer
Question Cancelled
98
A transmission line is called as a long transmission line when its length is?
Answer
B. More than 150 km
99
What should be the depth of the pit for a 9m long line support?
Answer
B. 1.5 m
100
What is the permitted variation from declared supply voltage to the consumers in case of
high voltage?
Answer
C. 12.5%
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