| Post Name | OVERSEER GR.II (Electrical), ELECTRICIAN, WPORKSHOP INSTRUCTOR etc..-VARIOUS |
|---|---|
| Question Paper Code | 075/2023 |
| Category Code | 208/2021, 318/2022, 338/2022, 340/2022, 678/2022 |
| Date of Test | 16 June 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Specific resistance of a conductor depends on
Answer
B. Conductor material
2
When five resistors each of 14 W are connected in parallel, the net resistance of the
combination is ________ ohms.
Answer
D. 2.8
3
Given 3 equal resistances. How many combinations of these three resistances can be
made ?
Answer
A. 4
4
Node analysis is an application of
Answer
B. KCl
5
Electric power is
i. Voltage Γ current
ii. Rate of energy
iii. Rate of work done
iv. Capacity to build voltage
Answer
C. i, ii and iii
6
The rms value of Sinusoidal ac current is equal to its value at an angle of
Answer
C. 45Β°
7
Internal resistances of a voltage source and current source are increased, what happens
to their power output ?
Answer
D. decrease for voltage source and increase for current source
8
Peak factor of a Sinusoidal wave is
Answer
C. 1.41
9
The value of equivalent load resistance R to be connected across a battery of internal
resistance r to get maximum power transfer to the load is
Answer
D. R = r
10
For a battery the terminal voltage decreases with
Answer
Question Cancelled
11
In a three phase system, the voltage between 2 phases is
Answer
B. line voltage
12
In a three phase system, voltage across phase to neutral is called
Answer
C. Phase voltage
13
For same line current and line voltages, power taken by delta connected load is
Answer
C. Equal to star connected load
14
In a three phase ac circuit, the sum of all three generated voltages is
Answer
C. Zero
15
If time period of an alternating voltage is increased, what happens to its average value ?
Answer
C. Canβt determine
16
In a parallel plate capacitor of capacitance value c, a plate is inserted at the middle of the
capacitor. What happens to its capacitance ?
Answer
A. Remains same
17
If rms voltage of V volts gets transformed to another circuit to get 10 V rms, then the
impedance of the transformed circuit will be
Answer
A. Higher than initial circuit
18
If number of turns, area of core and length of magnetic path are doubled, what happens
to the inductance of a coil ?
Answer
B. 4 times
19
An instantaneous change in voltage is not possible in
Answer
Question Cancelled
20
Between 1 mA to 20 mA, electric shock will be
Answer
B. painful
21
One Webber is equal to _________ maxwell.
Answer
A. 108
22
The mmF in a magnetic circuit is equal to
Answer
B. Effective current flow to the core
23
A charge q is located at the centre of a cube, the electric flux through any face is
A4nq 4nq 2nq 27q
Answer
B. ββ~
24
The relation between electric flux density D and field intensity E, with relative permittivity Ξ΅α΅£ and absolute permittivity Ξ΅β, is expressed by
Answer
A. E = D/(Ξ΅βΞ΅α΅£)
25
Which of the following types of charges on surface has position but not the dimensions ?
Answer
D. None of the above
26
during thunderstorm a 50 C charge is discharged between clouds. The time of discharge
is 20 ms. determine the lightning current.
Answer
D. None of the above
27
A capacitor is charged from a battery. After fully charged the battery is removed and a identical
uncharged capacitor is connected in parallel. The total energy of the combination is
Answer
C. decreases by a factor of 2
28
C is the capacitance of a parallel plate capacitor with air as dielectric. If half portion is
filled with a dielectric with permittivity of er, then the expression for new capacitance is
C C C C
Answer
A. [1 + Ξ΅r ]
29
Find the average current in an inductor if the total current is 50 A.
Answer
Question Cancelled
30
during Faradayβs electromagnetic induction experiment, the mechanical effort of movement
of magnet near a coil produce electricity in that coil. This can be explained on the basis of
Answer
B. lenzβs law and conservation of energy
31
Colour rendering index of lEd lamps
Answer
Question Cancelled
32
Unit of luminance is
candela meter 2  lumen 
  steradian
Answer
C. ο£ steradian ο£Έ
33
minimum size of earth conductor for 30 β 50 HP motor in SWG is
Answer
C. 1 SWG
34
One lamb should be controlled from 6 different places, for that how many intermediate
and two way switches are needed ?
Answer
B. 4 intermediate and 2 two way switch
35
Application of limit switch is
Answer
D. None of the above
36
The following symbol in electrical engineering is used for representing
Answer
C. Buzzer
37
IE Rule 88 deals with
Answer
B. Guarding in electrical system
38
The length of thread in GI conduit is
Answer
Question Cancelled
39
What is the short time temperature rating of XlPE cable ?
Answer
Question Cancelled
40
Typical tripping time for βCβ type mCB is of
Answer
B. 0.04 to 5 Second
41
Sometimes one wattmeter read negative, when conducting 3 phase power measurement
using two wattmeter. When does it occur ?
Answer
Question Cancelled
42
How can be connect the pressure coil of a wattmeter is, which consists of two pressure
coils ?
Answer
Question Cancelled
43
Integrating principle in the digital measurement is the conversion of
Answer
C. Voltage to frequency
44
Which of the following statement is/are correct about Owenβs bridge ?
i. measurement of unknown inductance.
ii. measurement of incremental permeability.
iii. measurement of incremental inductance.
Answer
D. All of the above (i, ii and iii)
45
A circle is seen on the screen of a CRO when two time varying signals of same frequency and
same magnitude are applied to X and y plates of CRO. The relative phase difference is
Answer
B. 90Β°
46
Calibration of a voltmeter is done through
Answer
D. A potentiometer
47
What would be the sensitivity of an ammeter which requires change of 2A in its coil to
produce a change in deflection of the pointer by 6 mm ?
Answer
C. 3 mm/A
48
A 0 to 300 V voltmeter has guaranteed accuracy of 1% full scale reading. The voltage
measured by the instrument is 96 V. The percent limiting error is
Answer
B. 3.13%
49
If an instrument has cramped scale for larger values, then it follows
Answer
C. logarithmic law
50
The power of a 1-phase 3.3 kV load drawing a current of 30 A is required to be measured
by means of a wattmeter having potential terminals marked as 110 V and current terminals
as 6 A. What is the transformation ratio of the CT ?
Answer
Question Cancelled
51
If an alternating voltage source is connected to a power transformer, its no load current
would be
Answer
B. Sinusoidal and lagging the voltage by less than 90Β°
52
Voltage regulation of a large transformer is mainly influenced by
Answer
C. Leakage fluxes and load power factor
53
As the load on the transformer is increased, the core losses
Answer
C. Remain constant
54
βCrawlingβ in an induction motor is due to
Answer
A. Space harmonics produced by winding currents
55
In a three-phase induction motor, torque T and supply voltage V are related as
Answer
C. T β VΒ²
56
A three phase slip-ring induction motor is wound for four poles in stator and six poles in
rotor. When a three phase balanced voltage source at 50 Hz is applied to the motor, it
will run at
Answer
D. Not run
57
A synchronous motor and an induction motor are connected to a common feeder line. To
operate the feeder line at unity power factor, the synchronous motor should be
Answer
B. Over-excited
58
Which of the following single phase motor has highest starting torque ?
Answer
A. Capacitor start motor
59
In an AC servomotor, the control winding is supplied with input voltage of
Answer
D. Same frequency as the reference winding voltage but with 90Β° phase difference
60
For a given stepper motor, which of the following torque has the highest numerical value ?
Answer
C. Holding torque
61
The interpoles in dC machines have a tapering shape in order to
Answer
C. reduce the saturation in the interpoles
62
If two 8-pole dC machines of identical armature are wound, one with lap winding and the
other with wave winding, then
Answer
D. wave wound machine will have more rated voltage and less current
63
If the speed of a dC motor increases with load torque, then it is a
Answer
C. differentially compounded motor
64
A dC shunt motor having unsaturated magnetic circuit runs at 1500 rpm with rated voltage.
If the applied voltage is half of rated voltage, the motor will run at
Answer
D. 1500 rpm
65
A dC shunt motor has external resistances of Ra and Rf in the armature and field circuits
respectively. Armature current at starting can be reduced by keeping
Answer
A. Ra maximum and Rf minimum
66
An electric train employing a DC series motor is running at a fixed speed. When a sudden
slight drop in the mains voltage occurs, what result will occurs ?
Answer
B. drop in speed and rise in current
67
A pair of similar dC shunt generators operates in parallel and supply a common load. It
is required to switch off machine 1 and allow machine 2 to supply the entire load. The
following operations are to be used to achieve this
i. switch off the main switch of machine 1
ii. reduce the field current of machine 1
iii. increase the field current of machine 2
iv. ensure that machine 1 just floats.
The correct sequence of these operations are
Answer
B. ii iii iv i
68
The most suitable generator for welding purpose is
Answer
D. differential compound generator
69
In DC shunt motors, the field excitation is kept maximum value during starting to
Answer
Question Cancelled
70
Three point starters of dC shunt motors are not used in applications where speed variation
by field flux control is required because
Answer
A. the motor may stop at very high speeds
71
For variable heads of near about less than 30 m, which type of turbine is used in
hydropower station ?
Answer
B. Kaplan turbine
72
In dC transmission line
Answer
D. there is no effects due to inductive and capacitive reactances
73
Series capacitive compensation on EHV transmission lines is used to
Answer
D. improve the stability of the system
74
Type of tidal energy generator which uses in a large dam is known as
Answer
A. barrage
75
In an open cycle mHd steam power plant, the temperature at the entrance of mHd duct is
Answer
D. 2500 β 3000 K
76
The angle at which a PV panel is installed from the horizontal affect its output. The ideal
angle from horizontal surface is
Answer
Question Cancelled
77
Wind mill called as βdarriensβ mill is
Answer
B. Vertical axis mill
78
What is the average wind velocity observed on earth ?
Answer
B. 9 m/sec
79
The type of insulator used on line up 33 KV is
i. Pin insulator
ii. Reel insulator
iii. Post insulator
iv. Strain insulator
Answer
Question Cancelled
80
What is the angle between the pole and stay in overhead lines ?
Answer
Question Cancelled
81
The output of an ANd gate is high when
Answer
A. All inputs are high
82
The decimal number corresponding to binary number 1101101.1011 is
Answer
C. 109.6875
83
Which of the following statement is/are correct about de-morganβs theorem ?
i. The complement of a product variable is equal to the sum of the complement of the
variables.
ii. The complement of a sum variable is equal to the product of the complement of the
variables.
iii. The complement of two or more variables OR ed is equal to the ANd ing of the
complement of the individual variables.
Answer
D. All of the above (i, ii and iii)
84
A digital circuit which accepts two input bits, one input carry bit and generates a sum
output bit and a carry bit is known as
Answer
B. Full adder
85
Which of the following flip-flop has invalid states in the output when all inputs are high ?
Answer
A. S R Flip-flop
86
The maximum voltage that appears across a diode in full wave rectifier during its blocking
state is called
Answer
D. Peak Inverse Voltage
87
Which of the following method is/are not used for triggering a Thyristor ?
Answer
A. di/dt triggering
88
Which of the following is a bidirectional Thyristor ?
Answer
B. TRIAC
89
Which of the following commutation method is employed in series inverters ?
Answer
C. load commutation
90
Which of the following is a dc regulated power supply that performs only stepdown of
voltage ?
Answer
B. Buck converter
91
Which of the following consists of a mechanical valve operated through an electrical coil ?
Answer
D. Solenoid valve
92
Which of the following starter is most economical and suitable for starting a 3.5 KW SCIm ?
Answer
C. direct on line starter
93
Two motors A and B are operated such a way that motor B should start only after
motor A has started. Which of the following arrangement is correct for this operation ?
i. Insert a normally open contact of contactor A in series with the contactor coil B.
ii. Insert a normally closed contact of contactor A in series with the contactor coil B.
iii. Insert a normally open contact of contactor B in series with the contactor coil A.
Answer
A. Only i
94
Which of the following sequence of connection is/are correct about an AC motor control
circuit ?
i. line β Fuse β N/C push button switch β N/O push button switch β OlR β Relay coil
β Neutral
ii. line β Fuse β N/C push button switch β Neutral β N/O push button switch β OlR β
Relay coil
iii. line β Fuse β N/C push button switch β N/O push button switch β OlR β Neutral β
Relay coil
Answer
C. Only i
95
Which of the following relay have inverse time current characteristic ?
Answer
B. Over current relay
96
A limit switch is used to control
Answer
C. Both
97
A three phase induction motor is said to be operated in single phasing condition when
i. Single phase is supplied to the motor.
ii. One of the three fuses on supply line blows off.
iii. Only two phases are supplied to the motor.
Answer
D. Only ii and iii
98
Which of the following single phase electric drive offers four quadrant operation ?
Answer
B. dual converter drive
99
Which of the following speed control method is not applicable for SCIm drives ?
Answer
D. Slip energy recovery control
100
Which of the following device is most suitable for Volts/Hertz speed control of high power
induction motor drive ?
Answer
C. Cyclo converter
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