Trade-based questions for ITI trades such as electrician, fitter, mechanic, electronics mechanic, turner, machinist, wireman, welder, refrigeration and AC and other notified trades - Question Bank

1. What is the SI unit of power?
A) Joule
B) Watt
C) Volt
D) Ampere
2. In a turner's lathe, what is the purpose of the tailstock?
A) To hold the workpiece
B) To support long workpieces and hold cutting tools for operations like drilling
C) To drive the workpiece
D) To control the cutting speed
3. What is the primary function of a regulator in an electrical system?
A) To increase voltage
B) To decrease voltage
C) To maintain a constant output voltage
D) To limit current
4. Which type of welding uses a consumable wire electrode and a shielding gas?
A) SMAW
B) GTAW
C) GMAW
D) FCAW
5. What is the main component of refrigerant in most common air conditioning systems?
A) Ammonia
B) Sulfur dioxide
C) Freon (e.g., R-22, R-410A)
D) Carbon dioxide
6. In a three-phase induction motor, what is the function of the slip?
A) To increase the starting torque
B) To ensure synchronous speed operation
C) To allow the rotor to rotate at a speed less than the synchronous speed, inducing current
D) To reduce power consumption
7. What is the process of joining two or more pieces of metal by melting them together, often with the addition of a filler metal?
A) Brazing
B) Soldering
C) Welding
D) Riveting
8. Which tool is used to measure the outside diameter of a cylindrical object with high precision?
A) Vernier caliper
B) Steel rule
C) Micrometer
D) Plier
9. What is the primary characteristic of Ohm's Law?
A) Power is equal to voltage times current
B) Voltage is equal to current times resistance
C) Current is equal to capacitance times voltage change rate
D) Resistance is inversely proportional to conductance
10. What is the function of a commutator in a DC generator?
A) To convert AC to DC
B) To increase the voltage
C) To reverse the direction of current in the armature coil
D) To reduce sparking
11. Which type of wiring is used for temporary installations or where flexibility is required?
A) Conduit wiring
B) Cleat wiring
C) Batten wiring
D) Flexible wiring
12. What is the purpose of the starter in a fluorescent lamp?
A) To regulate the current
B) To provide a high voltage pulse to initiate the arc
C) To convert AC to DC
D) To dim the light
13. Which type of motor has its rotor speed directly proportional to the supply frequency and inversely proportional to the number of poles?
A) DC motor
B) Induction motor
C) Synchronous motor
D) Universal motor
14. 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?
A) Specific heat
B) Sensible heat
C) Latent heat
D) Heat capacity
15. In a refrigeration system, what is the role of the compressor?
A) To cool the refrigerant
B) To absorb heat from the evaporator
C) To increase the pressure and temperature of the refrigerant vapor
D) To convert liquid refrigerant to gas
16. What is the purpose of a rectifier circuit?
A) To convert DC to AC
B) To convert AC to DC
C) To amplify AC signals
D) To filter out unwanted frequencies
17. Which of the following is a semiconductor device that can amplify or switch electronic signals?
A) Resistor
B) Capacitor
C) Inductor
D) Transistor
18. What is the primary function of a transformer?
A) To convert AC to DC
B) To increase or decrease AC voltage
C) To generate electrical power
D) To limit current flow
19. In a fitter's trade, what is the purpose of a die?
A) To drill holes
B) To cut internal threads
C) To cut external threads
D) To shape metal by pressing
20. What is the function of a vernier scale on a measuring instrument?
A) To increase the range of measurement
B) To provide a finer reading with greater accuracy
C) To measure angles
D) To measure surface roughness
21. Which measurement is used to determine the hardness of metals?
A) Tensile strength
B) Impact strength
C) Rockwell hardness test
D) Ductility
22. What is the purpose of the slag in an electrode during SMAW (Stick Welding)?
A) To increase the arc voltage
B) To protect the molten weld pool from atmospheric contamination
C) To provide additional filler material
D) To improve the electrical conductivity of the arc
23. Which type of AC welding machine provides a constant current output suitable for Stick welding?
A) AC Transformer machine
B) Inverter welding machine
C) AC/DC TIG welder
D) Multi-process welder
24. What is the primary role of an inductor in an electronic circuit?
A) To store energy in a magnetic field
B) To oppose changes in voltage
C) To block AC signals
D) To rectify AC to DC
25. What is the function of a capacitor in an electronic circuit?
A) To oppose changes in current
B) To store electrical energy in an electric field
C) To generate heat
D) To amplify signals
26. What is the main advantage of a switch-mode power supply (SMPS) over a linear power supply?
A) Simpler design
B) Lower efficiency
C) Higher efficiency and smaller size
D) Less electromagnetic interference
27. Which type of file is used for rough shaping and rapid material removal?
A) Smooth file
B) Second cut file
C) Bastard file
D) Rasp
28. What is the purpose of annealing in metalworking?
A) To increase hardness and strength
B) To reduce brittleness and improve ductility
C) To create a hard surface layer
D) To remove internal stresses
29. 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?
A) Latent heat
B) Specific heat capacity
C) Sensible heat
D) Heat of fusion
30. What is the function of an expansion valve in a refrigeration system?
A) To regulate the flow of refrigerant into the evaporator
B) To compress the refrigerant vapor
C) To condense the refrigerant vapor into liquid
D) To absorb heat from the refrigerated space
31. In a three-phase AC system, what is the phase difference between any two consecutive phases?
A) 60 degrees
B) 90 degrees
C) 120 degrees
D) 180 degrees
32. What is the SI unit of electric current?
A) Volt
B) Ohm
C) Watt
D) Ampere
33. Which safety device is designed to protect electrical circuits from overcurrent by melting and breaking the circuit?
A) Circuit breaker
B) Fuse
C) Relay
D) Contactor
34. What is the most common type of winding used in squirrel cage induction motors?
A) Lap winding
B) Wave winding
C) Squirrel cage winding
D) Drum winding
35. What is the purpose of the stator in an AC motor?
A) To rotate and produce torque
B) To provide the rotating magnetic field
C) To house the commutator
D) To connect the motor to the power supply
36. Which type of AC generator produces AC power at a constant frequency, irrespective of the load?
A) DC generator
B) Induction generator
C) Synchronous generator
D) Asynchronous generator
37. What is a transistor primarily used for in electronic circuits?
A) Rectification
B) Oscillation
C) Amplification and switching
D) Voltage regulation
38. In electronics, what is the primary function of a diode?
A) To amplify a signal
B) To store electrical energy
C) To allow current to flow in one direction only
D) To switch a circuit on and off
39. What is the process of removing unwanted material from a workpiece by using a cutting tool?
A) Grinding
B) Shaping
C) Machining
D) Drilling
40. Which tool is used to measure the diameter of a hole or the internal dimension of an object?
A) Outside caliper
B) Micrometer
C) Vernier caliper
D) Screwdriver
41. What is the function of the condenser in a refrigeration system?
A) To cool the refrigerant
B) To heat the refrigerant
C) To compress the refrigerant vapor
D) To expand the liquid refrigerant
42. In a refrigeration cycle, which component is responsible for absorbing heat from the refrigerated space?
A) Compressor
B) Condenser
C) Evaporator
D) Expansion valve
43. What is the unit of electrical resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
44. 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?
A) Ampere's Law
B) Biot-Savart Law
C) Faraday's Law of Induction
D) Lenz's Law
45. What is the main purpose of flux in soldering?
A) To increase the melting point of the solder
B) To act as an electrical insulator
C) To clean the metal surfaces and prevent oxidation
D) To provide structural strength to the joint
46. Which type of welding uses a non-consumable tungsten electrode and a shielding gas?
A) Shielded Metal Arc Welding (SMAW)
B) Gas Metal Arc Welding (GMAW)
C) Flux-Cored Arc Welding (FCAW)
D) Gas Tungsten Arc Welding (GTAW)
47. What does the 'star' connection in a three-phase transformer provide?
A) Higher starting torque
B) Neutral point for grounding
C) Lower voltage output
D) Increased power factor
48. Which type of AC motor is widely used due to its simple construction, robustness, and low cost?
A) Synchronous motor
B) DC motor
C) Induction motor
D) Universal motor
49. What is the primary function of a commutator in a DC motor?
A) To increase the speed of the motor
B) To reverse the direction of current in the armature windings
C) To convert AC to DC
D) To provide mechanical support to the armature
50. In a DC generator, the polarity of the generated EMF is determined by:
A) Fleming's Left-Hand Rule
B) Fleming's Right-Hand Rule
C) Lenz's Law
D) Ampere's Circuital Law
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