Trade-based questions for ITI trades such as electrician, fitter, mechanic, electronics mechanic, turner, machinist, wireman, welder, refrigeration and AC and other notified trades - One Line Questions
1.
In a three-phase AC system, what is the phase difference between any two consecutive phases? —
120 degrees
2.
Which type of AC welding machine provides a constant current output suitable for Stick welding? —
AC Transformer machine
3.
What is the main component of refrigerant in most common air conditioning systems? —
Freon (e.g., R-22, R-410A)
4.
Which law states that the induced EMF in any closed circuit is equal to the negative of the time rate of change of the magnetic flux enclosed by the circuit? —
Faraday's Law of Induction
5.
What is the process of joining two or more pieces of metal by melting them together, often with the addition of a filler metal? —
Welding
6.
Which safety device is designed to protect electrical circuits from overcurrent by melting and breaking the circuit? —
Fuse
7.
In a refrigeration cycle, which component is responsible for absorbing heat from the refrigerated space? —
Evaporator
8.
Which type of wiring is used for temporary installations or where flexibility is required? —
Flexible wiring
9.
Which type of AC generator produces AC power at a constant frequency, irrespective of the load? —
Synchronous generator
10.
Which type of motor has its rotor speed directly proportional to the supply frequency and inversely proportional to the number of poles? —
Synchronous motor
11.
In a DC generator, the polarity of the generated EMF is determined by: —
Fleming's Right-Hand Rule
12.
What is the process of removing unwanted material from a workpiece by using a cutting tool? —
Machining
13.
What does the 'star' connection in a three-phase transformer provide? —
Neutral point for grounding
14.
What is the SI unit of power? —
Watt
15.
What is the most common type of winding used in squirrel cage induction motors? —
Squirrel cage winding
16.
Which of the following is a measure of the amount of heat energy required to raise the temperature of a unit mass of a substance by one degree Celsius? —
Specific heat capacity
17.
Which type of circuit breaker is commonly used in residential distribution boards for overload and short-circuit protection? —
Miniature Circuit Breaker (MCB)
18.
Which tool is used to measure the diameter of a hole or the internal dimension of an object? —
Vernier caliper
19.
What is the primary characteristic of Ohm's Law? —
Voltage is equal to current times resistance
20.
What is a transistor primarily used for in electronic circuits? —
Amplification and switching
21.
Which of the following is a semiconductor device that can amplify or switch electronic signals? —
Transistor
22.
Which type of welding uses a non-consumable tungsten electrode and a shielding gas? —
Gas Tungsten Arc Welding (GTAW)
23.
What is the main advantage of a switch-mode power supply (SMPS) over a linear power supply? —
Higher efficiency and smaller size
24.
Which type of welding uses a consumable wire electrode and a shielding gas? —
GMAW
25.
Which type of file is used for rough shaping and rapid material removal? —
Bastard file
26.
What is the term for the amount of heat required to change the state of a substance (e.g., solid to liquid) without changing its temperature? —
Latent heat
27.
Which type of AC motor is widely used due to its simple construction, robustness, and low cost? —
Induction motor
28.
Which measurement is used to determine the hardness of metals? —
Rockwell hardness test
29.
In electronics, what is the primary function of a diode? —
To allow current to flow in one direction only
30.
What is the primary function of a transformer? —
To increase or decrease AC voltage
31.
What is the function of a commutator in a DC generator? —
To convert AC to DC
32.
What is the purpose of a rectifier circuit? —
To convert AC to DC
33.
What is the function of the condenser in a refrigeration system? —
To cool the refrigerant
34.
In a refrigeration system, what is the role of the compressor? —
To increase the pressure and temperature of the refrigerant vapor
35.
In a fitter's trade, what is the purpose of a die? —
To cut external threads
36.
In a turner's lathe, what is the purpose of the tailstock? —
To support long workpieces and hold cutting tools for operations like drilling
37.
What is the purpose of annealing in metalworking? —
To reduce brittleness and improve ductility
38.
What is the purpose of the slag in an electrode during SMAW (Stick Welding)? —
To protect the molten weld pool from atmospheric contamination
39.
What is the main purpose of flux in soldering? —
To clean the metal surfaces and prevent oxidation
40.
What is the function of a vernier scale on a measuring instrument? —
To provide a finer reading with greater accuracy
41.
What is the primary function of a commutator in a DC motor? —
To reverse the direction of current in the armature windings
42.
In a three-phase induction motor, what is the function of the slip? —
To allow the rotor to rotate at a speed less than the synchronous speed, inducing current
43.
What is the primary function of a regulator in an electrical system? —
To maintain a constant output voltage
44.
What is the function of a capacitor in an electronic circuit? —
To store electrical energy in an electric field
45.
What is the purpose of the starter in a fluorescent lamp? —
To provide a high voltage pulse to initiate the arc
46.
What is the function of an expansion valve in a refrigeration system? —
To regulate the flow of refrigerant into the evaporator
47.
What is the purpose of the stator in an AC motor? —
To provide the rotating magnetic field
48.
What is the primary role of an inductor in an electronic circuit? —
To store energy in a magnetic field
49.
Which tool is used to measure the outside diameter of a cylindrical object with high precision? —
Micrometer
50.
What is the unit of electrical resistance? —
Ohm