ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Resistance of a Conductor depends on which of the following?
A)
Temperature
B)
Tensile strength
C)
Malleability
D)
Dielectric strength
Option C is correct: Malleability.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
The ISI mark on an electrical product indicates:
A)
Imported product
B)
Government ownership
C)
Certified quality as per Indian standards
D)
Low-cost product
Correct answer: C — Certified quality as per Indian standards
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
What is an important safety precaution while using hand tools?
A)
Use damaged tools
B)
Ignore insulation
C)
Use tools with proper insulation
D)
Work with wet hands
Correct answer: C — Use tools with proper insulation
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Joint resistance should be:
A)
High
B)
Low
C)
Infinite
D)
Zero
Correct answer: B — Low
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Straight joint is used for:
A)
Branching
B)
Extending wires
C)
Earthing
D)
Insulation
Correct answer: B — Extending wires
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Fuse protects against:
A)
Voltage
B)
Overcurrent
C)
Frequency
D)
Power
Correct answer: B — Overcurrent
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Two Wattmeter method is used for:
A)
Balanced Load
B)
Unbalanced Load
C)
Both (a) and (b)
D)
None of the above
Option B is correct: Unbalanced Load.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
What distribution system is generally used for domestic power supply?
A)
Two phase three wire
B)
Single phase
C)
Three phase three wire
D)
Three phase four wire
Option B is correct: Single phase.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Earth pit contains:
A)
Sand only
B)
Charcoal & salt
C)
Water only
D)
Oil
Correct answer: B — Charcoal & salt
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Minimum ground clearance for 11kV overhead line across a road as per CEA Regulation is:
A)
6.0m
B)
6.1m
C)
6.2m
D)
6.3m
Option D is correct: 6.3m.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
The frequency of DC Power Supply is:
A)
0 Hz
B)
50 Hz
C)
60 Hz
D)
1 Hz
Option A is correct: 0 Hz.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Transistor is considered as ________.
A)
Active Device
B)
Passive Device
C)
Two terminal Device
D)
None of the above
Option B is correct: Passive Device.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Electrical energy unit is:
A)
Watt
B)
kWh
C)
Volt
D)
Ohm
Correct answer: B — kWh
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Insulators are materials with:
A)
Low resistance
B)
High resistance
C)
Zero resistance
D)
Negative resistance
Correct answer: B — High resistance
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Transformer oil is used for:
A)
Cooling and insulation
B)
Conductivity
C)
Strength
D)
Voltage
Correct answer: A — Cooling and insulation
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
The value of Resistance for 100W/230V rated bulb is:
A)
230
B)
43.47
C)
23000
D)
529
Using R = V²/P, R = 230²/100 = 529 Ω.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
If three resistances 6Ω, 6Ω, 6Ω are in parallel, what is the effective resistance?
A)
18 Ω
B)
12 Ω
C)
6 Ω
D)
2 Ω
Option D is correct: 2 Ω.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Regulator output is:
A)
AC
B)
Fluctuating DC
C)
Constant DC
D)
Pulsating
Correct answer: C — Constant DC
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Main function of transformer:
A)
Convert AC to DC
B)
Change voltage level
C)
Store energy
D)
Generate power
Correct answer: B — Change voltage level
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Moving Iron machine works on:
A)
Chemical Effect
B)
Magnetic Effect
C)
Gravitational Effect
D)
Heating Effect
Option B is correct: Magnetic Effect.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
What is the main reason a person gets an electric shock?
A)
High voltage only
B)
Contact with live conductor and ground
C)
Wearing rubber shoes
D)
Low temperature
Correct answer: B — Contact with live conductor and ground
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
How many diode does a Half wave rectifier requires?
A)
One
B)
Two
C)
Four
D)
None
Option D is correct: nan.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
__________ states that whenever magnetic flux is linked through a circuit an emf is always induced.
A)
Lenz’s Law
B)
Faraday’s Law
C)
Maxwell’s Law
D)
Newton’s Law
Option D is correct: Newton’s Law.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Which law is used to find the direction of self-induced electromotive force in a coil?
A)
Ampere’s Law
B)
Faraday’s Law
C)
Newton’s Law
D)
Lenz’s Law
Option A is correct: Ampere’s Law.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
What action is required before disconnecting ammeter connected with CT while it is live?
A)
Remove Neutral of Meter
B)
Remove Earthing at CT
C)
Open secondary of CT
D)
Short the secondary of CT
Option C is correct: Open secondary of CT.
