ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Which material is a good conductor?
A)
Rubber
B)
Glass
C)
Copper
D)
Plastic
Correct answer: C — Copper
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Silicon diode forward voltage:
A)
0.3 V
B)
0.7 V
C)
1.5 V
D)
3 V
Correct answer: B — 0.7 V
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
What is the recommended insulation rating of tools used for live electrical work (as per standard safety practice)?
A)
110 V
B)
250 V
C)
500 V
D)
1000 V
Correct answer: D — 1000 V
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Ammeter is connected:
A)
Parallel
B)
Series
C)
Open
D)
Ground
Correct answer: C — Open
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
In a right hand grip rule, thumb points in the direction of current, fingers point in the direction of
A)
Electric field
B)
Opposite to Electric field
C)
Magnetic field
D)
Opposite to Magnetic field
Option C is correct: Magnetic field.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
AC frequency in India is:
A)
60 Hz
B)
25 Hz
C)
50 Hz
D)
100 Hz
Correct answer: C — 50 Hz
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Voltage exceeding 650V but not exceeding 33000V is classified as:
A)
Low Voltage
B)
Medium Voltage
C)
High Voltage
D)
Extra High Voltage
Correct answer: C — High Voltage
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Typical transmission voltage level in India is:
A)
230 V
B)
11 kV
C)
132 kV and above
D)
440 V
Correct answer: C — 132 kV and above
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Total resistance in parallel circuit is:
A)
Greater than highest
B)
Less than lowest
C)
Equal to sum
D)
Infinite
Correct answer: B — Less than lowest
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Which devices is responsible for communicating Circuit Breaker in case of abnormal condition?
A)
Current Transformer
B)
Indicator
C)
Relay
D)
Annunciator
Option B is correct: Indicator.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Conduit wiring is preferred in commercial buildings because:
A)
Cheap
B)
Durable and safe
C)
Flexible
D)
Temporary
Correct answer: B — Durable and safe
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Mandatory signs are made in the shape of:
A)
Circular
B)
Square
C)
Triangle
D)
Rectangle
Option C is correct: Triangle.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Which of the following can close a switch?
A)
Busbar
B)
Isolator
C)
Bushing
D)
All of the above
Option B is correct: Isolator.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
The fullform for CFL is:
A)
Complex Fluorescent Light
B)
Compact Fluorescent Light
C)
Compound Fluorescent Light
D)
All of the above
Option B is correct: Compact Fluorescent Light.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Transistor is used for:
A)
Storage
B)
Amplification
C)
Insulation
D)
Cooling
Correct answer: B — Amplification
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Reverse bias diode acts as:
A)
Conductor
B)
Insulator
C)
Generator
D)
Amplifier
Correct answer: B — Insulator
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Main purpose of soldering in joints:
A)
Decoration
B)
Insulation
C)
Electrical continuity
D)
Cooling
Correct answer: C — Electrical continuity
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Which fire extinguisher is most suitable for electrical fires?
A)
Water type
B)
Foam type
C)
CO type
D)
Dry sand
Correct answer: C — CO type
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
The region between P-N junction of a diode is called:
A)
Meeting region
B)
Depletion region
C)
Collaborative region
D)
Devoid region
Option B is correct: Depletion region.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Capacitor bank is used for:
A)
Increase current
B)
Power factor improvement
C)
Voltage drop
D)
Resistance
Correct answer: B — Power factor improvement
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Material normally used for Insulation Tape is:
A)
Fibre
B)
Paper
C)
Lathroid
D)
Plastic
Option B is correct: Paper.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
How much electrical energy is consumed if Heater 1000W/230V is used for 120 minutes?
A)
1.2 kWh
B)
2.3 kWh
C)
1.0 kWh
D)
2.0 kWh
Option A is correct: 1.2 kWh.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
What is the full form of GFCI?
A)
Ground Fault Circuit Intervention
B)
Ground Fault Circuit Innovation
C)
Ground Fault Circuit Increment
D)
Ground Fault Circuit Interrupter
Option B is correct: Ground Fault Circuit Innovation.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Voltage regulator IC example:
A)
555
B)
7805
C)
741
D)
8085
Option B is correct: 7805.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Buchholz relay is used in __________.
A)
Transformer
B)
Generator
C)
Motor
D)
Isolator
Option B is correct: Generator.
