| Post Name | JUNIOR INSTRUCTOR (WIREMAN) - Industrial Training |
|---|---|
| Question Paper Code | 015/2025 |
| Category Code | 673/2023 |
| Date of Test | 30 January 2025 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which of the following statement/s is/are correct regarding energy shells of an atom?
(i) The valence shell of a carbon atom has 4 electrons.
(ii) The valence shell of a copper atom has 1 electron.
(iii) The valence shell of a aluminium atom has 3 electrons.
Answer
D. (i), (ii) and (iii)
2
The voltage (V) can be derived from the following equation/s:
(i) V = EMF β Voltage drop
(ii) V = Current Γ Resistance
(iii) V = Power /
Answer
C. urrent Γ Power factor)
(iv) V = Current / Resistance
3
Match the following as per effect of electric current:
(1) Chemical effect (i) Battery charging
(2) Heating effect (ii) Neon Lamp
(3) Gas Ionization effect (iii) tungsten filament lamp
Answer
B. (1)β(i), (2)β(iii), (3)β(ii)
4
Which of the following statement/s is/are correct regarding risk of fire during cable
connections and termination?
(i) The insulation is cut back too far
(ii) The capacity of the plug is inadequate
(iii) The connections are too tight
Answer
D. Only (i) and (ii)
5
Which of the following statement/s is/are correct regarding voltage grading of cables?
(i) Low voltage (L.V): from 0 to 250 volts
(ii) Medium voltage (M.V): Exceeding 250 V but not exceeding 1500 V
(iii) High voltage (H.V): Exceeding 1500 V but not exceeding 33000 V
Answer
Question Cancelled
6
Identify the correct statement/s about soldering:
(i) Soldering always involves the use of pressure during the process.
(ii) The melting point of lead-free solder is typically lower than that of lead-based
solder.
(iii) Flux is used to clean the surfaces and prevent oxidation during soldering.
(iv) In soldering, components are bonded using a molten filler metal.
Answer
B. Only (iii) and (iv)
7
Identify the correct statement/s about Kirchhoffβs Voltage Law (KVL):
(i) KVL states that the sum of currents entering a junction is zero.
(ii) KVL applies to only DC circuits and not AC circuits.
(iii) KVL states that the sum of all voltage drops around a closed loop equals zero.
(iv) KVL is valid only for circuits containing resistors.
Answer
A. Only (iii)
8
Identify the correct statement about the law of resistance:
Answer
C. Resistance depends on the material, length, and cross-sectional area of the
conductor.
9
Identify the correct statement/s about the Wheatstone Bridge:
(i) The bridge is balanced when no current flows through the galvanometer.
(ii) The bridge is balanced when the ratio of resistances in one arm equals the ratio in
the other arm.
(iii) The Wheatstone Bridge is used to measure unknown resistances with high
precision.
(iv) The Wheatstone Bridge works based on Kirchhoffβs Voltage and Current Laws.
Answer
D. (i), (ii), (iii) and (iv)
10
Select the correct statement/s about the relationship between voltage, current, and
resistance:
(i) When resistance increases, the current increases if the voltage remains constant.
(ii) Voltage is equal to the product of current and resistance.
(iii) Current is inversely proportional to voltage at constant resistance.
(iv) Ohmβs Law shows that current increases with resistance at constant voltage
Answer
A. Only (ii)
11
Select the term, represents the technique used to control the corrosion of a metal surface
by making it as the cathode of an electro chemical cell?
Answer
B. Cathode Protection(CP)
12
According to Faradayβs First law of electrolysis, The mass of ions liberated at any
electrode during Electrolysis is ββββββββββ
Answer
C. Proportional to quantity of electricity passed through the electrolyte
13
What is the approximate value of the Electro Chemical Equivalent (ECE) of silver at
mg/c (milligram per coulomb)?
Answer
D. None of these
14
Choose the rechargeable cell from the following:
Answer
B. Nickel - Cadmium cell
15
Which type of positive plate inside the Lead acid battery is made by pure Lead at the
beginning and change to Lead peroxide by the process of repeated charging and
discharging?
Answer
B. Plante plate
16
When the cell is fully charged, it freely gives off hydrogen at cathode and oxygen at the
anode, the process being known as:
Answer
D. Gassing
17
Which of the following inspection is not done before charging battery?
Answer
A. Weight of the electrolyte
18
What type of charging method is used if the available supply is high voltage DC 220V,
110V etc?
Answer
C. Constant current method
19
Which one of the following is not a defect of Lead Acid Battery?
Answer
D. Polarization
20
What is the main difference between Nickel - Iron cell and Nickel β Cadmium cell?
Answer
A. Type of negative plates
21
Which winding of a DC machine (Generator/Motor) carries alternating current only?
Answer
D. Armature winding
22
Among the following, which one is not a part of DC Generator?
Answer
C. End ring
23
Why is the armature of the DC Generator made up of laminated high grade steel?
Answer
A. To reduce hysteresis loss and eddy current loss
24
The periphery of the armature divided by the number of poles of the DC Generator is
called ββββββββββ, ie the distance between two adjacent poles
Answer
B. Pole pitch
25
Among the following, which condition is not required for the build up of voltage in a
DC Generator (self Excitated)?
Answer
A. If excited at load, armature resistance should be high
26
Which type of DC generator shows rising voltage characteristics with an increase in
load?
Answer
Question Cancelled
27
How can you increase the speed of a DC shunt motor?
Answer
B. by reduce flux
28
Which type of DC motor is used for driving constant speed line shafting?
Answer
D. DC shunt Motor
29
Which type of DC Motor starter has a protective resistor?
Answer
C. 4 β Point starter
30
Flemingβs Left hand rule is used :
Answer
Question Cancelled
31
What is the purpose of the flexible cords in domestic wiring?
Answer
D. Connection transportable appliances
32
How many two way switches are required in godown wiring circuit to control four lamps?
Answer
B. 3
33
Where the Iron Clad Double Pole (ICDP) main switch is used?
Answer
C. Single phase domestic installations
34
What is the maximum permissible load for a power sub circuit as per I.E rules?
Answer
D. 3000 Watt
35
What is the reason for supplying AC to the electrodes for measuring earth resistance?
Answer
D. Avoid the effect of electrolytic emf interference
A 7 015/2025
36
Which electrical accessory belongs to general classification of accessories?
Answer
B. Ceiling roses
37
What is the expansion of ECC?
Answer
B. Earth Continuity Conductor
38
Which material is coated in tungsten electrode of a fluorescent tube lamp?
Answer
D. Barium and strontium oxide
39
What is the function of leak transformer in high pressure sodium
vapour lamp circuit?
Answer
D. Ignite the high voltage initially
40
Which is the cold cathode lamp?
Answer
A. Neon sign lamp
41
From the given options choose the unit of magnetic flux :
Answer
B. volt second
42
Magnetic lines of force coming from a magnet :
Answer
C. cannot intersect at all
43
The magnetic material used in permanent magnet is :
Answer
D. Hardened steel
015/2025 8 A
44
Which of the following rule is used to determine the direction of rotation of an electric
motor?
Answer
D. Flemingβs left hand rule
45
The energy stored in the magnetic field of a solenoid of 100 cm long and cm diameter
Ο
with 1000 turns of wire carrying a current of 10 A is :
Answer
A. 0.05 J
46
Which of these cannot store energy?
Answer
B. Resistor
47
The permeability of a material is 0.997. It is a ββββββββββ material
Answer
A. Diamagnetic
48
Five equal capacitors are connected in series, the resultant capacitance is 4 micro farad.
When these capacitors are connected in parallel and charged to 400 volt d.c. the total
energy stored is :
Answer
D. 8J
49
Two parallel wires separated by a distance d are carrying a current I in the same
direction. The magnetic field along a line running parallel to these wires and midway
between them :
Answer
B. Is zero
50
The area of hysteresis loop is a measure of :
Answer
D. Energy loss per cycle
51
The average value of a sinusoidal alternating current in a circuit is found to be 10
Ampere, The maximum value of current is :
Answer
B. 15.7 A
52
The value of each resistor in a delta network that is equivalent to a star network consisting of three equal resistors of value R ohm is __________ ohm.
Answer
D. 3R
53
Answer
B. 10 V
54
The north pole of a magnet is moved away from a metallic ring. Th induced current in
the ring flows:
Answer
Question Cancelled
55
Which of the following incandescent lamp will have maximum resistance?
Answer
C. 25 watt bulb
56
The principle of dynamically induced emf is utilized in
Answer
C. Generator
57
A lamp of 100 W at rated voltage of 200 V, is supplied by a source of 100 V. It will be
equivalent to a lamp of :
Answer
B. 25 W
58
For an alternating quantity, the form factor is defined as:
Answer
A. RMS value
Mean value
59
The instantanuous value of alternating current in a circuit is expressed as
i = 50 sin 360 t , where t is time in seconds. The frequency of the alternating current is:
2Ο 360
Answer
B. Hz
360 2Ο
60
Polar form 12 < 30ο― can be represented in rectangular form as:
Answer
D. 10.4 + j 6
61
When temperature increases, the energy gap in a semiconductor
Answer
B. decreases
62
The released light energy in a LED is depends on :
Answer
D. the recombination of holes and electrons
63
Peak Inverse Voltage of each diode in a center-tapped full-wave rectifier is :
Answer
A. 2 Vm
64
When does the zener diode begins to conduct in the reverse biased condition?
Answer
C. Voltage across it reached zener voltage
65
What is the effect of pinch-off voltage in JFET?
Answer
Question Cancelled
66
Which is the three terminal, negative voltage regulator IC?
Answer
A. IC 7905
67
Which logic gate has the following truth table?
Inputs Output
A B Y
0 0 0
0 1 0
1 0 0
1 1 1
Answer
D. AND gate
68
What is the effect, if SCR is latched into conduction and gate pulse is removed?
Answer
C. Gate losses control over conduction
69
In a full-wave bridge rectifier, the load current in each of the diode flows for :
Answer
B. Half-cycle of input AC signal
70
What is the criteria to decide a material as conductor, semi conductor and insulator?
Answer
D. Valance electrons exists in an atom
71
Which of the following statement is/are correct regarding energy conversion in rotating
electrical machines?
(i) During energy conversion, out of total input energy some energy is converted into
required form, some energy is stored and rest is dissipated.
(ii) During energy conversion, out of total input energy some energy is converted into
required form, and rest is dissipated.
(iii) Reaction of coupling field on the electrical or mechanical system is essential for
energy conversion process.
Answer
B. Only (i) and (iii)
72
Which of the following statement is/are true about the armature winding of an
alternator?
(i) For a full pitched winding, coil span is 360Β° electrical.
(ii) Distributed winding diminishes armature reaction and armature reactance.
(iii) Star or delta connection suppress tripplen harmonics across the lines.
Answer
A. Only (ii) and (iii)
73
Consider the following test results obtained to determine the regulation by EMF method,
of a 2 kV single phase alternator delivering a current of 200 A at 0.8 pf leading.
Test results
Full load current of 200 A is produced on short circuit by a field excitation of 5 A and an
emf of 600 V is produced on open circuit by same field current.
The value of synchronous impedance is :
Answer
A. 3Ξ©
74
If the excitation of an alternator changes during parallel operation, then it will affect :
Answer
B. power factor and kVAr output
75
Find the odd one out :
Answer
D. Shaded pole motor
76
The speed of the rotor field with respect to the stator field of a 4 pole induction motor
working on 50 Hz supply having 4 % slip is :
Answer
C. 0 rpm
77
Which of the following statements is/are true about torque of an Induction motor?
(i) Maximum torque is directly proportional to square of stator voltage.
(ii) Maximum torque is independent of rotor circuit resistance.
(iii) The slip at which maximum torque occurs is independent of rotor circuit resistance.
Answer
C. Only (i) and (ii)
78
Choose the correct statement/s regarding single phasing of three phase induction motors.
Answer
Question Cancelled
79
Which among the following starting methods is not used for a cage type induction motor?
Answer
D. Rotor resistance starting
80
Identify the odd one from the following methods of speed control of a three phase
induction motor :
Answer
B. By injecting an emf in the rotor circuit
81
Consider the following statements :
(i) The efficiency of a transformer is same at the same load at 0.8 pf lag and 0.8 pf
lead.
(ii) Power transformers are designed to have maximum efficiency at or near full load.
(iii) Distribution transformers are designed for lower iron losses.
Identify the correct statements from the following options :
Answer
D. All of the above (i), (ii) and (iii)
82
The maximum efficiency of a 20 kVA, 2000/200 V transformer occurs at 80% of full load.
Then the ratio of full load copper loss to iron loss is :
25 16
Answer
A. 6
83
Identify the wrong statement/s from the options given below :
Answer
B. In a transformer with concentric windings, low voltage winding is placed near
the core to reduce core loss
84
For a Two winding transformer and Auto-transformer having same input, output and
voltage ratio (k), the ratio of weight of conductor in two winding transformer to weight of
conductor in Auto-transformer is
Answer
D. k 1βk
85
The necessary condition for parallel operation of transformers is/are :
x
Answer
A. Same polarity
86
The ON Load tap changing circuit of a transformer is provided with an impedance :
Answer
C. to limit the short circuit current during tap changing
87
Which of the following statements is/are true about instrument transformers?
(i) The burden of an instrument transformer refers to the load connected across the
secondary winding.
(ii) The Current Transformer
Answer
B. Only (i) and (ii)
88
For an ideal transformer the values of permeability and reluctance respectively are :
Answer
A. β, 0
89
Which of the following method/s are used to reduce leakage flux in a transformer?
Answer
D. All of the above
90
If a 220 V dc supply is given to a 220/440 V. 50 Hz transformer, then the transformer
will :
Answer
D. burn its windings
91
In MI instruments, the necessary magnetic field is produced by ampere- turns of current
carrying coil. This statement is applicable in :
(i) Attraction and Induction type instruments
(ii) Repulsion and Vibrating type Instruments
(iii) Attraction and repulsion type instruments
(iv) Dynamometer type instruments
Answer
D. Only (iii)
92
Substation is the assembly of apparatus used to change some Electrical characteristics
such as :
(i) Voltage
(ii) AC to DC
(iii) Frequency
(iv) Active power
Answer
C. Only (i), (ii) and (iii)
93
In Moving coil Instruments, deflecting torque (Td) is equal to :
(i) Force Γ Displacement
(ii) Force Γ Perpendicular Distance
(iii) NBI Γ Area
(iv) None of the above
Answer
D. only (ii) and (iii)
94
The scales of Dynamometer type Wattmeter scales are more or less uniform, because :
(i) Deflection is proportional to True power
(ii) Deflection is proportional to active power
(iii) Deflection is proportional to product of True power Γ instantaneous Voltage
(iv) Deflection is proportional to average power
Answer
A. Only (iv)
95
In underground cable system, the properties of Insulating material include :
(i) High Dielectric strength
(ii) High mechanical strength
(iii) Low specific resistance
(iv) Non-inflammable
Answer
A. Only (i), (ii) and (iv)
96
In single phase watt-hour meter, the ring placed over the center limp of shunt magnet is
used for compensating phase errors because :
(i) The flux due to shunt magnet does not lag behind the voltage by 90 degrees
exactly.
(ii) The flux due to series magnet does not lag behind the current by 90 degrees
exactly.
(iii) The flux due to shunt and series magnet does not lag behind the voltage by 90
degrees exactly.
(iv) The flux due to shunt magnet does not lead behind the voltage by 90 degrees
exactly.
Answer
A. only (i)
97
In short Transmission lines, the effect of line capacitance is neglecting in calculations
because :
(i) Such lines have smaller lengths.
(ii) Such lines transmitting the power at relatively low voltages.
(iii) Such lines have smaller lengths and transmitting the power at relatively low
voltages.
(iv) Such lines have less reactive power.
Answer
Question Cancelled
98
The load curve on the power station is defined as :
(i) Variation of curve with respect to max. demand
(ii) Variation of curve with respect to time
(iii) Variation of curve with respect to average load
(iv) Variation of curve with respect to connected load
Answer
B. only (ii)
99
In the designing of electrical transmission line meets :
(i) Economic choice of Transmission voltage
(ii) Economic choice of Transmission power
(iii) Economic choice of supporting structures
(iv) Economic choice of conductor size
Answer
B. Only (i) and (iv)
100
In Underground system the insulation resistance of a single core cable is :
(i) Directly proportional length
(ii) Inversely proportional to length
(iii) Directly proportional to area
(iv) Inversely proportional to area
Answer
B. Only (ii)
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