ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Glare in lighting can be reduced by:
A)
Increasing brightness
B)
Using diffusers
C)
Increasing voltage
D)
Decreasing distance
Correct answer: B — Using diffusers
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
3-point starter controls:
A)
Voltage
B)
Current
C)
Speed
D)
Resistance
Correct answer: C — Speed
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
The primary safety function of the earth wire in domestic appliances is to:
A)
Carry normal operating current back to the source
B)
Provide a low impedance path for fault current
C)
Act as a backup neutral when the neutral wire breaks
D)
Improve the power factor of inductive appliances like fans and motors
Correct answer: B — Provide a low impedance path for fault current
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
An enclosure or cable entry rated IP65 provides:
A)
Protection against dust and continuous immersion
B)
Dust-tight protection and resistance to low-pressure water jets
C)
No protection against solids but full water immersion
D)
Only finger protection (IP2X)
Option D is correct: Only finger protection (IP2X).
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
The minimum insulation resistance for LT cable should be:
A)
0.1 M
B)
0.5 M
C)
1 M
D)
10 M
Correct answer: C — 1 M
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Table and pedestal fans in India generally use:
A)
Split capacitor single-phase induction motor
B)
Universal motor
C)
Shaded-pole motor with high starting current
D)
Three-phase squirrel cage motor
Option B is correct: Universal motor.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Eddy current loss is reduced by:
A)
Solid core
B)
Laminated core
C)
Copper core
D)
Air core
Correct answer: B — Laminated core
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Core material is:
A)
Copper
B)
Silicon steel
C)
Aluminium
D)
Iron rod
Correct answer: B — Silicon steel
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Armoured cable provides:
A)
Insulation
B)
Mechanical protection
C)
Conductivity
D)
Voltage
Correct answer: B — Mechanical protection
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
According to the Inverse Square Law of illumination (for a point source), if the distance between the source and surface is doubled, the illumination becomes:
A)
Double
B)
Half
C)
One-fourth
D)
Four times
Option A is correct: Double.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Which appliance works on heating effect of current?
A)
Fan
B)
Iron
C)
Refrigerator
D)
Mixer
Correct answer: B — Iron
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Blocking diode in solar circuit is used to prevent:
A)
Overcharging
B)
Short circuit
C)
Lightning strike
D)
Reverse current flow
Option B is correct: Short circuit.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
In DC motors, plugging is a method of:
A)
Speed increase
B)
Braking
C)
Field control
D)
Starting
Option A is correct: Speed increase.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
High Pressure Sodium Vapour (HPSV) lamp is preferred for:
A)
Street lighting and outdoor area lighting
B)
Stage lighting only
C)
Indoor decoration only
D)
Emergency lights
Option C is correct: Indoor decoration only.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Insulation resistance of underground cable is tested by:
A)
Voltmeter
B)
Ammeter
C)
Megger
D)
Wattmeter
Correct answer: C — Megger
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Which electrical items are to be installed in the control panel?
A)
Switching & Indicator
B)
Bus bar & Protection
C)
Metering & Control
D)
All of the above
Option D is correct: All of the above.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
According to IE rules, which part of the panel board should be earthed?
A)
All bus bars
B)
All live parts
C)
All metal parts
D)
All connectors
Option B is correct: All live parts.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
XLPE insulated cables are preferred over PVC in many industrial applications because they offer:
A)
Lower current carrying capacity
B)
Higher temperature tolerance and better moisture/chemical resistance
C)
Lower cost only
D)
Poorer mechanical strength
Option C is correct: Lower cost only.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Which type of wiring is most suitable for a heavy industrial workshop?
A)
Cleat wiring
B)
Casing and capping
C)
Conduit wiring
D)
Batten wiring
Correct answer: C — Conduit wiring
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
No-load condition in series motor leads to:
A)
Safe operation
B)
High speed (dangerous)
C)
Low speed
D)
Zero speed
Correct answer: B — High speed (dangerous)
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Speed of a DC shunt motor is controlled below base speed by:
A)
Increasing supply voltage beyond rated value
B)
Field flux weakening using a diverter
C)
Short-circuiting the field winding partially
D)
Armature voltage control or resistance in armature circuit
Correct answer: D — Armature voltage control or resistance in armature circuit
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Conservator in a transformer:
A)
Allows oil expansion
B)
Cools the oil by forced circulation
C)
Detects internal faults
D)
Provides tap changer space
Option A is correct: Allows oil expansion.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Which method is used for locating cable faults?
A)
Loop test
B)
Megger test
C)
Voltage drop test
D)
Load test
Correct answer: A — Loop test
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
5P10 Accuracy of a Current Transformer refers to _________.
A)
0.5% Accuracy upto 10A additional current
B)
5% Accuracy upto 10A additional current
C)
0.5% Accuracy upto 10 times rated current
D)
5% Accuracy upto 10 times rated current
Option B is correct: 5% Accuracy upto 10A additional current.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Continuity test of motor winding is performed using:
A)
Megger
B)
Growler only
C)
Voltmeter in series
D)
Multimeter
Option B is correct: Growler only.
