ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Which of the following configurations of Bipolar Junction Transistor is known Voltage follower?
A)
Common Base
B)
Common Collector
C)
Common Emitter
D)
Common Controller
Option D is correct: Common Controller.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Color code red-red-brown in resistor represents:
A)
22 Ω
B)
220 Ω
C)
2.2 kΩ
D)
2200 Ω
Red-red-brown gives 22 × 10 = 220 Ω.
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
Lightning arrester protects against:
A)
Overload
B)
Short circuit
C)
Surge voltage
D)
Low voltage
Correct answer: C — Surge voltage
ITI Instructor • 2026 • Paper-III (Wireman - Technical Paper-I)
In an electrical current, Electron flows from:
A)
Negative to Positive terminals
B)
Positive to Negative terminals
C)
Positive to Neutral terminals
D)
Negative to Neutral terminals
Correct answer: A — Negative to Positive terminals
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
According to IE Rules, what is the maximum permissible load in a single lighting sub-circuit?
A)
500 W
B)
800 W
C)
1000 W
D)
1200 W
Correct answer: B — 800 W
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The time period of a sine wave is 1/50 seconds. Its frequency is:
A)
100 Hz
B)
60 Hz
C)
50 Hz
D)
25 Hz
Correct answer: C — 50 Hz
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
What is the correct temperature range for soft soldering?
A)
Below 450°C
B)
Above 1000°C
C)
Room temperature
D)
Below 100°C
Option B is correct: Above 1000°C.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Two lamps (100W and 40W) are connected in series. Which one will glow brighter?
A)
100W lamp
B)
40W lamp
C)
Both equally
D)
Neither
Option C is correct: Both equally.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
A null-deflection instrument measures a quantity by:
A)
Direct deflection
B)
Balancing the unknown against a known reference
C)
Measuring frequency
D)
Using a transducer
Option B is correct: Balancing the unknown against a known reference.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
If a resistor in a series circuit burns out and becomes an open circuit, the total resistance of the circuit becomes:
A)
Zero
B)
Half
C)
Infinite
D)
Same as the failed resistor
Option C is correct: Infinite.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
A high discharge test should not be performed for more than _____ seconds to avoid damaging the plates.
A)
5
B)
15
C)
30
D)
60
Correct answer: B — 15
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
In a pure inductive circuit, the power factor is:
A)
Unity
B)
Zero, lagging
C)
Zero, leading
D)
0.5, lagging
Correct answer: B — Zero, lagging
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
What is the process of achieving uniform dielectric stress in a cable called?
A)
Armouring
B)
Grading
C)
Serving
D)
Impregnation
Option D is correct: Impregnation.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Electrical energy can be converted into:
A)
Heat
B)
Light
C)
Mechanical energy
D)
All of these
Option C is correct: Mechanical energy.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which factor affects battery life?
A)
Color
B)
Size
C)
Charging and discharging cycles
D)
Shape
Correct answer: C — Charging and discharging cycles
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Which instrument is used to check the specific gravity of the electrolyte?
A)
Voltmeter
B)
Ammeter
C)
Hydrometer
D)
Thermometer
Correct answer: C — Hydrometer
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
What is the minimum size of a copper conductor used in domestic wiring?
A)
1/1.12 mm
B)
1/1.40 mm
C)
3/20 mm
D)
1/1.0 mm
Correct answer: B — 1/1.40 mm
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
A fuse is connected in:
A)
Neutral wire
B)
Earth wire
C)
Phase wire
D)
Both neutral and earth
Correct answer: C — Phase wire
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
In a series circuit, if one component breaks, the current in the entire circuit will:
A)
Increase
B)
Decrease
C)
Stop flowing
D)
Stay the same
Option C is correct: Stop flowing.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
When using the voltmeter-ammeter method, which connection is preferred for measuring low resistance?
A)
Voltmeter connected across the source
B)
Voltmeter connected across the resistance
C)
Ammeter connected across the resistance
D)
None of the above
Option B is correct: Voltmeter connected across the resistance.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
What does a yellow triangular safety sign indicate?
A)
Mandatory action
B)
Warning or hazard
C)
Fire Safety
D)
Safe Condition
Option C is correct: Fire Safety.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
Semiconductor conductivity lies between:
A)
Conductor and insulator
B)
Metal and alloy
C)
Plastic and rubber
D)
Wire and cable
Option D is correct: Wire and cable.
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
The earth wire is connected to:
A)
Neutral
B)
Phase
C)
Metal body of equipment
D)
Battery
Correct answer: C — Metal body of equipment
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
A capacitor blocks _____ and allows _____ to pass.
A)
AC, DC
B)
DC, AC
C)
Low frequency, High frequency
D)
Voltage, Current
Correct answer: B — DC, AC
ITI Instructor • 2026 • Paper-III (Electrician - Technical Paper-I)
What is the main purpose of soldering?
A)
To join conductors electrically and mechanically
B)
To insulate wires
C)
To increase resistance
D)
To cool conductors
Option B is correct: To insulate wires.
