ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
The purpose of a timer relay in a control panel is _________.
A)
to provide delay in device operation
B)
to provide voltage accuracy check
C)
to check for time accuracy of an operation
D)
All of the above
Option D is correct: All of the above.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Which fault in underground cables is detected by continuity test?
A)
Short circuit between cores
B)
Open circuit
C)
High insulation resistance
D)
Overcurrent only
Option A is correct: Short circuit between cores.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
What is the recommended average illumination level for general Industrial areas like canteens?
A)
50 lux
B)
100 lux
C)
150 lux
D)
300 lux
Option B is correct: 100 lux.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Double compression cable glands are primarily used for:
A)
Unarmoured cables only
B)
Heavy armoured cables to provide better sealing
C)
Communication cables
D)
Indoor light duty applications only
Option C is correct: Communication cables.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
The basic principle of DC generator is:
A)
Electrostatic induction
B)
Electromagnetic induction
C)
Chemical reaction
D)
Thermal effect
Correct answer: B — Electromagnetic induction
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Control fuse protects:
A)
Power circuit
B)
Control circuit
C)
Transformer
D)
Motor
Correct answer: B — Control circuit
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
An induction cooktop / heater primarily works on:
A)
High-frequency eddy current
B)
Direct resistance heating of the vessel
C)
Convection heating by nichrome coil
D)
Infrared radiation
Option B is correct: Direct resistance heating of the vessel.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
What is the minimum number of earth terminals that should be there on a panel board?
A)
1
B)
2
C)
3
D)
4
Option B is correct: 2.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Starter is used to:
A)
Increase voltage
B)
Limit starting current
C)
Increase speed
D)
Reduce torque
Correct answer: B — Limit starting current
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Cable ties are used for:
A)
Insulation
B)
Binding cables
C)
Conducting current
D)
Measuring voltage
Correct answer: B — Binding cables
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
In a 3-phase induction motor, the rotating magnetic field is produced by:
A)
120° phase-displaced currents in stator windings
B)
Single-phase supply with auxiliary winding
C)
DC supply to rotor slip rings
D)
Mechanical rotation of the rotor at synchronous speed
Correct answer: A — 120° phase-displaced currents in stator windings
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Induction motor works on:
A)
DC supply
B)
Electromagnetic induction
C)
Electrostatic force
D)
Chemical reaction
Correct answer: B — Electromagnetic induction
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Ideal transformer has:
A)
Losses
B)
No losses
C)
Resistance
D)
Heat
Correct answer: B — No losses
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
Rotor resistance starter is used only for:
A)
DC motors
B)
Synchronous motors
C)
Squirrel-cage motors
D)
Slip-ring induction motors
Correct answer: D — Slip-ring induction motors
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)
Brushes are made of:
A)
Copper
B)
Carbon
C)
Aluminium
D)
Iron
Correct answer: B — Carbon
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
AC and DC generator produce ____ & ___ in their armature respectively.
A)
DC, DC
B)
AC, DC
C)
DC, AC
D)
AC, AC
Option C is correct: DC, AC.
ITI Instructor • 2026 • Paper-IV (Wireman - Technical Paper-II)
As temperature increases, the efficiency of a typical silicon solar cell:
A)
Increases
B)
Decreases
C)
Remains constant
D)
Becomes zero
Option B is correct: Decreases.
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)
Transformer rating is in:
A)
kWA
B)
kVA
C)
kV
D)
kW
Correct answer: B — kVA
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)
Which lamp has the highest efficiency?
A)
Incandescent lamp
B)
Fluorescent lamp
C)
LED lamp
D)
Mercury vapor lamp
Correct answer: C — LED lamp
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)
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.
