| Post Name | Lineman-PWD (Electrical Wing) |
|---|---|
| Question Paper Code | 131/2021 |
| Category Code | 258/2021 |
| Date of Test | 19 December 2021 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which law states that in closed electric circuit the applied voltage is equal to the sum
of the voltage drops?
Answer
D. Kirchhoff's second law
2
What is the formula for Quantity of electricity (Q) ?
Answer
A. Current x Time
3
Which one defines the change in resistance in Ohm (Ω) per degree centigrade
Answer
D. C)?
4
Resistance of 250V, 100W lamp will be ________
Answer
C. 625 Ω
5
The resistivity of conductor ________
Answer
Question Cancelled
6
The reciprocal of resistance is ________
Answer
A. Conductance
7
What are the three factors essential to make a simple electric circuit?
Answer
Question Cancelled
8
If short circuit is occurred in an electric circuit, then the value of resistance will be
______
Answer
C. Zero
9
The current in a series circuit is ________
Answer
A. Same throughout the circuit
10
The low value resistance can be measured by ________
Answer
C. Kelvin bridge method
11
As per Ohm's law the current is ________
Answer
A. Directly proportional to the voltage
12
Ohm's law states the relation between ________
Answer
B. E.M.F. Current and Resistance
13
The formula for current I according to Ohm’s law is
Answer
C. I = V/R
14
What is the change of resistance value of the conductor as its diameter is doubled?
Answer
Question Cancelled
15
What is the value of resistance in an open circuit ?
Answer
D. Infinity
4 131/2021
16
The parallel circuit is used for ________
Answer
A. House wiring
17
Which is the application of series circuit?
Answer
A. Fuse in circuit
18
In Ohm's law the condition is that
Answer
B. The temperature should remain constant
19
The resistance of a conductor on increasing the temperature
Answer
C. Increases
20
In a parallel circuit across each resistance
Answer
A. Current divides and voltage remains the same
21
The property of a material which opposes the creation of magnetic flux in it is
known as
Answer
B. Reluctance
22
Reciprocal of reluctance is
Answer
C. Permeance
23
Direction of forces on a conductor in a magnetic field is determined by ________
Answer
B. Fleming's left hand rule
24
A property of material which opposes the creation of magnetic flux in it is known as
________
Answer
B. Reluctance
25
In electrical machines laminated cores are used with a view to reducing ________
Answer
B. Eddy current loss
26
The magnitude of induced e.m.f. is directly proportional to the ________
Answer
B. Rate of change of flux linkage
27
Static electromagnetic induction is adopted in ________
Answer
C. Transformers
28
Eddy currents produced in a core ________
Answer
B. Create loss of useful energy
29
For an inductance current is proportional to ________
Answer
A. Magnetic field
30
The electrical current is analogous to the magnetic circuit ________
Answer
A. Flux
31
Electric current is defined as ________
Answer
A. Flow of electrons in a conductor
32
What is the polarity of an AC source?
Answer
D. Change at regular intervals
33
What is the standard domestic supply voltage in India as per Indian standard?
Answer
A. 240 V
34
Why AC transmission is preferred to long distance than DC?
Answer
A. Less line losses
35
How much time is required by 50Hz AC supply to complete one cycle?
Answer
B. 0.02 second
36
What is the equation used to calculate the effective value (Vrms) of voltage in a wave?
Answer
A. Vrms = 0.707 Vmax
37
In an A.C. circuit, a low value of kVAR compared with kW indicates ________
Answer
B. High p.f.
38
In an A.C. circuit, the ratio of kW/kVA represents ________
Answer
B. Power factor
39
In A.C. circuits, laminated iron is used to ________
Answer
A. Reduce eddy current loss
40
An alternating current or voltage is that which
Answer
C. Changes in both magnitude and direction
41
Compound generator is a
Answer
B. Self excited generator
42
In DC lap winding number of parallel path A =
Answer
A. P
43
What is the emf in a 6 pole lap wound armature having 18 slots, 2 conductor per slot
shaft rotating at 100 RPM, flux per pole is 0.1 Wb?
Answer
A. 6V
44
As per Fleming's right hand rule, middle finger points the direction of
Answer
A. Induced emf
45
Load current of a DC series generator is
Answer
B. equal to series field current
46
In a long shunt compound DC generator the shunt field winding is connected in parallel
with
Answer
D. Series connected armature and series field combination
47
The direction of rotation of DC motor can't change by
Answer
Question Cancelled
48
Speed of a DC motor
Answer
B. Directly proportional of back emf
49
Shaft torque in DC motor is
Answer
A. less than armature torque
50
A DC shunt motor is connected with 200V DC supply. It takes a line current of 18A.
What will be the Armature current if shunt field resistance is 100 Ω?
Answer
D. 16A
51
The motor used in mixer grinder
Answer
B. Universal motor
52
An Induction motor with 6 poles rotating at a speed of 950 rpm using 50 Hz supply.
The percentage of slip is
Answer
A. 5%
53
D.O.L. starter is used to start the motor up to
Answer
B. 5 HP
54
In slip ring induction motor starter 3 external variable resistances are
Answer
C. Connected in Star with rotor circuit
55
Which of the following is suitable for starting squirrel cage induction motor?
Answer
D. Auto transformer starter
56
DIN rail is used to mount
Answer
B. Circuit breakers
57
Which of the following is not a method of synchronisation?
Answer
D. MMF method
58
Centrifugal switch in a centrifugal pump motor is used to control
Answer
A. Supply through the starting winding
59
Speed of a SCIM can be changed by
Answer
A. Varying number of poles
60
Growler is a
Answer
A. Armature testing machine
61
Moderator is a part of
Answer
D. Nuclear power plant
62
The part which reduces the water hammering effect in hydroelectric power plant
system
Answer
C. Surge tank
63
Demand factor X connected load =
Answer
C. Maximum demand
64
Solar P.V. module efficiency will always be
Answer
B. less than cell efficiency
65
Service lines are the part of
Answer
D. Secondary distribution
66
Solar panel output does not depend on
Answer
D. AH capacity of connected battery
67
Example for non-conventional energy source
Answer
C. Sun
68
Conducting media in MHD Tunnel is
Answer
B. Plasma
69
An 8 pole alternator produces 50 Hz supply. What will be the speed in rpm?
Answer
A. 750
70
Unit of solar irradiance is
Answer
C. W/m2
71
Advantage of D.C. Transmission system
Answer
D. All of the above
131/2021 [P.T.O 11
72
Skin effect of a conductor
Answer
A. Increases with increase in diameter
73
Which is provided to prevent the entry of moisture in UG cables?
Answer
C. Metallic sheath
74
Value of fusing factor is always
Answer
D. greater than one
75
Which effect is accompanied by the production of ozone in OH line?
Answer
B. Corona effect
76
Sag in overheadline S = , Here 'l' stands for
8T
Answer
C. Length of span
77
Buchholz relay is located
Answer
B. In between conservator tank and main tank
78
It gives support to the pole against falling
Answer
B. Stay set
79
Most of the substations are used to
Answer
C. Change the voltage
80
Horn gap type surge diverter is a
Answer
A. Lightning arrester
81
The transistor configuration used for impedance matching is
Answer
C. CC
82
In PN junction diode the depletion region contains
Answer
C. Immobile ions
83
Peak inverse voltage of a centre-tapped full-wave rectifier is
Answer
B. 2Vₘ
84
When transistor is used as a switch its region of operation is
Answer
D. Both B and C
85
The forbidden energy gap for silicon semiconductor is
Answer
Question Cancelled
86
The rectification efficiency of a half wave rectifier is
Answer
B. 40.6%
87
Unit of luminous flux is
Answer
B. lumen
88
The material which can be used for filaments of incandescent lamps must possess
Answer
D. All of the above
131/2021 [P.T.O 13
89
According to inverse square law, the illumination of a surface is
Answer
C. inversely proportional to square of distance between surface and the source
90
Electric motor used in mixer grinder is
Answer
A. universal motor
91
Which one of the following is an indicating type Instrument?
Answer
D. Both
92
The instrument that totalizes events over a specific period of time is called
Answer
C. Integrating instrument
93
Induction type measuring instruments are used for
Answer
A. AC measurements only
94
Calculate the deflection (Θ in degrees) for a moving coil instrument with deflection
torque (Td) is given by 30 µNm and control spring constant is 2 µNm/degree.
Answer
Question Cancelled
95
Which one of the following is a disadvantage of PMMC (permanent magnet moving
coil instrument)?
Answer
D. Errors due to ageing of control spring and the permanent magnet.
96
Which of the following parameters remains unchanged between primary and secondary
windings of a step up transformer?
Answer
D. Frequency
14 131/2021
97
Which one the following is NOT a criterion for the parallel operation of transformer?
Answer
A. The transformers are to be connected properly so that the net voltage around the
local loop is not zero.
98
A 20 kVA, 50 Hz, 2000/200V distribution transformer has primary turns of 200. The
maximum flux in the core is given by ________ webers.
Answer
B. 0.045
99
Which of the following cooling methods is used for very large size transformers?
Answer
C. Oil to water heat exchanger unit
100
The fusing characteristic is a curve between
Answer
B. Fusing time and percentage of fuse current.
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