| Post Name | TRAINING INSTRUCTOR (ELECTRICIAN)-SCHEDULED CASTE DEVELOPMENT DEPARTMENT |
|---|---|
| Question Paper Code | 032/2020 |
| Category Code | 102/2017 |
| Date of Test | 16 September 2020 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
If in a conductor n is the number of free electrons available per m3, v be the axial drift
velocity of electrons in meters/second, A is area of cross-section of the conductor
and e is the charge of free electrons then what will be the current density J ?
nev ne
Answer
D. nev
A vA
2
If there are three resistors of R Ohm, in which two resistors are connected in parallel and the third resistor is connected in series with this parallel combination, what will be the effective resistance of this series-parallel circuit?
Answer
C. (R + 2R)/2
3
Resistance of a material is independent of
Answer
A. Magnetic flux
4
What will be the current drawn by a lamp of rating 230 V, 100 W when it is connected
across 50 V dc supply ?
Answer
A. 0.0945 A
5
1 kWh is equal to
Answer
B. 36 � 105 J
6
What is the unit of power?
Answer
B. J/s
7
According to Kirchhoff’s voltage law in a closed loop:
Answer
C. ΣIR + Σemf = 0
8
When two resistors R1 and R2 are connected in series and this series combination
is connected across V volts. What will be the voltage across resistor R1 ?
V V
Answer
Question Cancelled
9
Two resistors 4 Ohm and R Ohm are connected in parallel across 20 V supply. What
will be the value of unknown resistor R when 100 W power is dissipated in it ?
Answer
B. 4 �
10
The circuit whose properties or characteristics are the same in either direction is
Answer
D. None of these
11
What is the unit of absolute permittivity ?
Answer
A. Farad/meter
12
According to Coulomb’s Law what will be the force between two charges Q1 and Q2
at a distance r meters in vacuum ?
9 Q1Q2 �9 Q1Q 2
Answer
A. 9 � 10 2
13
Unit of electric field is
Answer
C. Newton/Coulomb
14
If in shifting one Coulomb of positive charge from infinity to a certain point in the
electric field, the work done and potential of that point are
Answer
A. One Joule and one volt
15
The capacitance of multiplate capacitor is
(n �
Answer
A. �0 �r A (n �
16
When two capacitors 10 �F and 20 �F are connected in series what will be its
equivalent capacitance ?
Answer
C. 6.66 �F
17
The ratio of intensity of magnetisation I to the magnetising force H is called
Answer
D. Susceptibility
18
Which parameter in magnetic circuit is analogous to resistivity in electric circuit ?
Answer
C. Reluctivity
19
Ratio of total flux to useful flux is
Answer
D. Leakage coefficient
20
Which one is the Diamagnetic material ?
Answer
C. Bismuth
21
Amplitude factor is the ratio of
Answer
C. Maximum value and RMS value
22
The current flowing in a purely inductive circuit is
� �� � ��
Answer
B. Im sin � �t � �
� 2� � 2�
� �� � ��
23
The value of j is
Answer
Question Cancelled
24
Q factor is the ratio of
Z R L R
Answer
A. B
25
A coil is connected in series with a pure capacitor. The combination is fed from a
10 V supply of 10000 Hz. It was observed that the maximum current of 2 A flows in
the circuit when the capacitor is of value 1 microfarad. What is the value of R ?
Answer
Question Cancelled
26
The instantaneous value of voltage across a capacitor of 10F is Vm sin 314t. What
will be the reactance of the circuit ?
1 1
Answer
C. �
27
R12, R23 and R31 are the three resistors in star configuration. What will be the
expression of R1 in delta configuration ?
R12R31 R23R12
Answer
Question Cancelled
28
What is the RMS value of rectified alternating current?
Answer
Question Cancelled
29
The maximum value of instantaneous power of pure capacitive circuit is
Vm Im Vm Im
Answer
B. 2� 2
Vm Im V I
30
In a three phase star connected system the angle between line voltage and its phase
voltage is
Answer
C. 30�
31
One of the following meter is not used for measuring a dc electric quantity
Answer
D. Power factor meter
32
One of the following instrument gives multiple electric quantities from a connected
circuit
Answer
Question Cancelled
33
The easiest way to identify a PMMC instrument is
Answer
A. Uniform scale
34
In two wattmeter method of three phase power measurement, when the power factor
is 0.5 lagging
Answer
B. One wattmeter will read total power
35
The range of a voltmeter can be extended by
Answer
A. Connecting a high value resistor in series with the meter
36
A synchroscope is used for
Answer
D. None of the above
37
Which of the following meter having the possibility of creeping error ?
Answer
C. Energy meter
38
Which of the following is a step-up transformer ?
Answer
C. Current transformer
39
A CRO is not used for
Answer
B. Current measurement
40
Which of the following can be used for inductance measurements ?
Answer
A. Maxwell bridge
41
Which of the following is an electrical safety requirement ?
Answer
A. Use IS specified materials for all installation
42
Which of the incorrect first aid provided to a person who have an electric hazard ?
Answer
A. Immediately give drinking water
43
Which of the correct statement for an electrical installation ?
Answer
C. A switch board is to be installed so that its bottom lies 1.25 meter above the
floor
44
Which one of the following is wrong for testing of insulation resistance between the
wiring and earth ?
Answer
Question Cancelled
45
In a lighting sub circuit, the total load/No. of points shall be limited to:
Answer
B. 800 W/10 points
46
Which one of the following is an indication of fully charged 12 V battery ?
Answer
C. Specific gravity of electrolyte is 1.21
47
Which of the following is an electrolyte in lead acid battery ?
Answer
C. Dilute sulfuric acid
48
The capacity of battery is expressed in
Answer
C. Ampere hour
49
Which type solar cell is more efficient ?
Answer
B. Mono crystal
50
What number of cell required for get 24 V terminal voltage of a lead acid battery ?
Answer
C. 12
51
One of the following is a temporary wiring
Answer
Question Cancelled
52
Which type of wiring is not suitable where acid or alkalis are likely to be present ?
Answer
Question Cancelled
53
The IS specification of wire used for domestic wiring is
Answer
B. 1 sq.mm 1100V PVC insulated wire
54
As per IS specification maximum current carrying capacity of 1.5 sq.mm copper
wire is
Answer
B. 10A
55
The material used for fuse element is
Answer
Question Cancelled
56
The most commonly used fuse in house wiring is
Answer
C. Kit-kat fuse
57
One of the material is not used as a filler in the HRC fuse
Answer
D. Graphite powder
58
The one of the switch is used as isolator of star delta starter
Answer
C. ICTP
59
Standard size of copper plate for plate earthing is
Answer
B. 60 � 60 cm 3.15 mm
60
MCB used for an electrical installation is
Answer
B. Over current protection
61
In d.c. machine the yoke is made of
Answer
A. Cast steel
62
The armature of a d.c. machine is laminated in order to reduce
Answer
B. Eddy current loss
63
In d.c. machine the armature winding is placed on rotor to
Answer
B. Facilitate commutation
64
In a d.c. machine, the number of armature segments is equal to
Answer
Question Cancelled
65
The parallel paths of an 8 pole duplex lap winding will be
Answer
C. 16
66
Carbon brushes are preferable to copper brushes due to
Answer
D. They reduce sparking
67
The speed of a d.c. motor can be controlled by
Answer
D. All of the above
68
Motor starters are essential for
Answer
C. Avoiding excessive starting current
69
The efficiency of a d.c. motor when developing maximum mechanical power will be
Answer
A. Less than 50%
70
If the load current and magnetic flux of a d.c. motor are held constant and voltage
applied across its armature is increased by 5%, the speed of the motor will
Answer
D. Increase by 5%
71
The primary and secondary of a transformer are coupled
Answer
B. Magnetically
72
A two winding transformer operates at maximum efficiency when its
Answer
C. Copper loss equals iron loss
73
The transformer that does not provide electric isolation is
Answer
D. Auto transformer
74
The synchronous speed of a three phase induction motor having 20 poles and
connected to a 50 Hz source is
Answer
A. 300 r.p.m.
75
In a squirrel cage induction motor, the maximum torque developed under running
condition is
Answer
C. Much higher than full load torque
76
The purpose of starting winding in a single phase induction motor is to
Answer
A. Produce rotating flux in conjunction with main winding
77
The stator of an alternator is identical to that of a
Answer
B. three phase induction motor
78
An under excited alternator supplies
Answer
C. Leading VAR
79
Damper windings are used in alternators to
Answer
A. Prevent hunting
80
A resistance split phase induction motor is used for
Answer
B. Low inertial loads
81
The decimal equivalent of (101111.1101)2 is
Answer
D. 47.812510
82
Nibble is
Answer
A. A string of 4 bits
83
If A and B are the inputs of an EXCLUSIVE OR gate circuit, its output Y is given by
Answer
A. Y � AB � AB
84
The Boolean expression Y = A(A + B), when simplified, becomes:
Answer
D. A
85
The minimum number of flip-flop required to build a mode 20 counter is
Answer
D. 5
86
The fan out of a logic gate is
Answer
A. The number of subsequent circuits which the gate can drive
87
How many 7483 IC’s are required to add two bytes data ?
Answer
B. 2
88
By placing an inverter to the input of an SR flip-flop, the resulting flip-flop becomes:
Answer
B. D flip-flop
89
The number of flip-flop needed to divide input frequency by 64 is
Answer
D. 6
90
Which of the following is not a specification of a D/A or A/D converter?
Answer
A. Gain
91
In a thyristor
Answer
C. IH is associated with turn off process and IL is associated with turn on process
92
For a UJT employed for triggering of an SCR, intrinsic stand-off ratio η = 0.64 and dc source voltage = 20 V. The UJT would trigger when the emitter voltage is:
Answer
Question Cancelled
93
In a properly biased JFET will acts as a
Answer
C. Voltage controlled current source
94
The structure of IGBT is a
Answer
C. PNPN structure connected by a MOS gate
95
The anode current through a conducting SCR is 10 A, if its gate current is made
one-fourth, then what will be the anode current ?
Answer
C. 10 A
96
Which of the following device is used for triggering of TRIAC ?
Answer
C. DIAC
97
A boost regulator has an input voltage of 5 V and the average output of 15 V. The duty cycle is:
Answer
B. 2/3
98
For a full bridge inverter with the following load R = 4 Ω, XL = 10 Ω, XC = 6 Ω:
Answer
B. The output current lags the voltage by 45°
99
Which one is used to protect a thyristor from di/dt condition ?
Answer
A. Inductor
100
6Ah in an UPS battery specification means
Answer
Question Cancelled
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