ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The total resistance of three 6-ohm resistors connected in parallel is:
A)
18 ohms
B)
2 ohms
C)
6 ohms
D)
12 ohms
Option B is correct: 2 ohms.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which fire extinguisher is suitable for electrical fires?
A)
Water extinguisher
B)
Foam extinguisher
C)
CO extinguisher
D)
Sand bucket
Option A is correct: Water extinguisher.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The process of coating a metal with a thin layer of another metal using electrolysis is:
A)
Galvanizing
B)
Electroplating
C)
Reduction
D)
Oxidation
Correct answer: B — Electroplating
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The average value of a sinusoidal AC current over one complete cycle is:
A)
0.637 I
B)
0.707 I
C)
Zero
D)
I
Correct answer: C — Zero
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
A parallel AC circuit in resonance will:
A)
Have low impedance.
B)
Have high impedance.
C)
Act like a capacitor.
D)
Act like an inductor.
Correct answer: B — Have high impedance.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which of the following works on the principle of electromagnetic induction?
A)
DC Motor
B)
Transformer
C)
Electric Iron
D)
Electrostatic precipitator
Option B is correct: Transformer.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which type of capacitor is generally polarized and used in DC power supplies?
A)
Ceramic Capacitor
B)
Mica Capacitor
C)
Electrolytic Capacitor
D)
Air Capacitor
Correct answer: C — Electrolytic Capacitor
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The chemical effect of electric current results in:
A)
Heat generation
B)
Light emission
C)
Chemical decomposition of electrolyte
D)
Magnetic field
Correct answer: C — Chemical decomposition of electrolyte
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which protective device is a better alternative to a fuse as it does not require replacement?
A)
Switch
B)
MCB (Miniature Circuit Breaker)
C)
Socket
D)
Conduit
Option C is correct: Socket.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Electrical code mainly ensures:
A)
Design beauty
B)
Safety
C)
Cost reduction
D)
Speed
Correct answer: B — Safety
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
What is the SI unit of electric charge?
A)
Ampere
B)
Volt
C)
Coulomb
D)
Ohm
Option C is correct: Coulomb.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The error caused by improper calibration is:
A)
Random error
B)
Systematic error
C)
Gross error
D)
Human error
Correct answer: B — Systematic error
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The power factor of a series RLC circuit at resonance is:
A)
0
B)
0.5
C)
0.8
D)
1
Correct answer: D — 1
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which accessory is used to control current?
A)
Socket
B)
Plug
C)
Switch
D)
Lamp holder
Correct answer: C — Switch
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Lenz’s Law is a consequence of the conservation of:
A)
Charge
B)
Momentum
C)
Energy
D)
Mass
Correct answer: C — Energy
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Good conductor has:
A)
High resistance
B)
Low resistance
C)
No electrons
D)
High insulation
Option C is correct: No electrons.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
A short circuit in a parallel branch typically results in:
A)
Zero resistance and high current
B)
Infinite resistance and zero current
C)
No change in current
D)
Increased voltage
Option B is correct: Infinite resistance and zero current.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Work is defined as:
A)
Force × Distance
B)
Voltage × Current
C)
Power × Time
D)
Resistance × Current
Option C is correct: Power × Time.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
If the distance between the plates of a capacitor is decreased, the capacitance:
A)
Decreases
B)
Increases
C)
Remains constant
D)
Becomes zero
Correct answer: B — Increases
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Illumination level depends on:
A)
Current only
B)
Voltage only
C)
Distance and light intensity
D)
Resistance
Correct answer: C — Distance and light intensity
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which of the following is a secondary cell?
A)
Dry cell
B)
Daniell cell
C)
Lead-acid cell
D)
Mercury cell
Correct answer: C — Lead-acid cell
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The power factor can be improved (kept high) to:
A)
Increase line losses.
B)
Decrease the voltage rating of the generator.
C)
Increase generator capacity.
D)
Add capacitive load in the circuit.
Correct answer: D — Add capacitive load in the circuit.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The efficiency of a battery is reduced due to:
A)
High EMF
B)
Low temperature
C)
Internal resistance
D)
High capacity
Correct answer: C — Internal resistance
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which method of earthing is most common?
A)
Strip earthing
B)
Plate earthing
C)
Wire earthing
D)
Rod earthing
Correct answer: D — Rod earthing
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Induced EMF in a coil is proportional to the negative rate of change of magnetic flux. The negative sign represents:
A)
Faraday’s Law
B)
Maxwell’s Law
C)
Lenz’s Law
D)
Ohm’s Law
Correct answer: C — Lenz’s Law
