Trade-based questions for diploma-engineering candidates in mechanical, electrical, electronics and automobile engineering - One Line Questions

1. In electronics, what does a diode primarily do? — Allows current to flow in only one direction
2. Which of the following is a common method for hardening steel? — Quenching and tempering
3. In a DC motor, the back EMF is proportional to: — Motor speed
4. Which type of bearing is best suited for high radial loads and moderate axial loads? — Roller bearing
5. Which component of a car's braking system converts hydraulic pressure into mechanical force? — Brake caliper/wheel cylinder
6. Which of the following is a characteristic of a series DC generator? — Voltage decreases with load
7. Which type of motor is commonly used in applications requiring variable speed control? — Variable frequency drive (VFD) controlled induction motor
8. Which type of engine typically uses spark plugs for ignition? — Gasoline (Petrol) engine
9. Which type of coupling is used to connect two shafts that are not perfectly aligned? — Universal coupling
10. Which manufacturing process involves forcing molten metal into a mold cavity? — Casting
11. Which automotive system is responsible for delivering fuel to the engine's cylinders? — Fuel system
12. In a semiconductor, doping is done to: — Increase its electrical conductivity
13. Which type of AC generator produces voltage and frequency that are directly proportional to its speed? — Synchronous generator
14. Which type of circuit breaker uses a bimetallic strip to trip the circuit? — Thermal circuit breaker
15. Which law states that for every action, there is an equal and opposite reaction? — Newton's Third Law
16. Which law governs the relationship between the flow rate of a fluid and the pressure difference across a pipe? — Hagen-Poiseuille Equation
17. Which type of heat treatment is used to increase the hardness and strength of steel by heating and rapid cooling? — Hardening
18. What is the phenomenon where a changing magnetic field induces an electromotive force (EMF) in a conductor? — Electromagnetic Induction
19. What is the main component of a typical transistor? — Three semiconductor layers
20. What is the unit of kinematic viscosity? — Stokes
21. What does the term 'Pascal's Law' relate to? — Pressure in fluids
22. Which of the following is a measure of the opposition to current flow in an AC circuit? — Impedance
23. Which electronic component acts as a switch and amplifier? — Transistor
24. What is the primary advantage of using a three-phase AC power system over a single-phase system? — More efficient power transmission and generation of rotating magnetic fields
25. Which type of welding uses a non-consumable tungsten electrode? — GTAW (Gas Tungsten Arc Welding)
26. What is the term for the process of removing impurities from a metal by heating it below its melting point? — Refining
27. Which component in a car's suspension system absorbs shocks and provides a smoother ride? — Shock absorber (damper)
28. Which type of gear is used to transmit motion between two non-parallel shafts? — Bevel gear
29. What does the term 'viscosity' measure? — The resistance of a fluid to flow
30. In automotive terms, what does 'engine displacement' refer to? — The total volume swept by all pistons in one engine cycle
31. What is the purpose of a governor in a prime mover? — To regulate speed under varying loads
32. What is the primary function of the crankshaft in an internal combustion engine? — To convert reciprocating motion of pistons into rotational motion
33. What is the function of a rectifier in an electrical system? — To convert AC to DC
34. What is the main purpose of the rotor in an AC induction motor? — To convert electrical energy into mechanical energy
35. What is the function of the radiator in an automobile's cooling system? — To transfer heat from the coolant to the surrounding air
36. What is the purpose of a catalytic converter in an automobile? — To reduce harmful emissions
37. In metallurgy, what is annealing primarily used for? — To reduce brittleness and improve ductility
38. What is the primary purpose of a flywheel in an engine? — To smooth out rotational speed fluctuations
39. Which of the following is a primary function of a transformer? — To change the level of AC voltage
40. What is the purpose of a commutator in a DC motor? — To reverse the direction of current in the armature winding
41. What is the function of a capacitor in an AC circuit? — To oppose changes in voltage
42. What is the function of a transformer's core? — To conduct the magnetic flux between the windings
43. What is the purpose of the clutch in a manual transmission vehicle? — To allow the engine to be disconnected from the transmission temporarily
44. In a three-phase induction motor, what is the purpose of the stator winding? — To generate a rotating magnetic field
45. What is the primary role of an amplifier in an electronic circuit? — To increase signal amplitude
46. What is the function of the alternator in a car? — To charge the battery and power electrical systems while the engine is running
47. What is the primary function of a resistor in an electronic circuit? — To oppose the flow of current
48. What is the term for the measure of how much a material resists scratching or abrasion? — Hardness
49. What is the term for the maximum stress a material can withstand before it begins to deform permanently? — Yield strength
50. What is the unit of electrical power? — Watt
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