Piston Engines MCQs January 8, 2026August 22, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. What is the primary function of a piston engine? (A) To convert fuel into mechanical power (B) To produce thrust (C) To generate electrical power (D) To drive a propeller 2. What type of combustion occurs in a piston engine? (A) External combustion (B) Pre-combustion (C) Jet combustion (D) Internal combustion 3. In a four-stroke piston engine, what are the four main strokes? (A) Compression, Power, Idle, Exhaust (B) Intake, Power, Exhaust, Idle (C) Intake, Compression, Power, Exhaust (D) Intake, Compression, Power, Idle 4. What component in a piston engine provides the power to turn the crankshaft? (A) Piston (B) Camshaft (C) Valve (D) Flywheel 5. What is the purpose of the crankshaft in a piston engine? (A) To convert the linear motion of the pistons into rotational motion (B) To compress the air-fuel mixture (C) To regulate the timing of valve openings (D) To distribute fuel to the cylinders 6. Which stroke in a four-stroke engine involves the intake of air-fuel mixture? (A) Compression (B) Intake (C) Exhaust (D) Power 7. What component controls the timing of the opening and closing of valves in a piston engine? (A) Flywheel (B) Crankshaft (C) Camshaft (D) Timing belt 8. What is the main function of the spark plug in a piston engine? (A) To cool the engine (B) To ignite the air-fuel mixture (C) To control valve timing (D) To lubricate the engine components 9. What does the term “compression ratio” refer to in a piston engine? (A) The ratio of power output to fuel consumption (B) The ratio of the cylinder volume at bottom dead center to the volume at top dead center (C) The ratio of the engine speed to the vehicle speed (D) The ratio of the fuel pressure to the air pressure 10. In a piston engine, what is the function of the connecting rod? (A) To regulate the fuel flow (B) To open and close the valves (C) To connect the piston to the crankshaft (D) To ignite the air-fuel mixture 11. What type of cooling system is commonly used in piston engines? (A) Air cooling (B) Water cooling (C) Oil cooling (D) Refrigeration 12. What is the role of the camshaft in a piston engine? (A) To provide power to the crankshaft (B) To convert piston motion into rotational motion (C) To drive the timing of valve operation (D) To compress the air-fuel mixture 13. Which type of piston engine configuration uses opposed cylinders? (A) Inline (B) V-type (C) Boxer (D) Radial 14. What is the primary purpose of the intake manifold in a piston engine? (A) To distribute the air-fuel mixture to the engine cylinders (B) To increase the engine’s power output (C) To regulate the engine temperature (D) To control the exhaust gases 15. In a piston engine, what is the purpose of the piston rings? (A) To control the timing of the valves (B) To ignite the fuel (C) To cool the engine (D) To seal the combustion chamber and prevent oil leakage 16. Which type of fuel is commonly used in piston engines? (A) Diesel (B) LPG (C) Jet fuel (D) Gasoline 17. What is the function of the valve tappets in a piston engine? (A) To ignite the fuel (B) To regulate the air-fuel mixture (C) To provide cooling for the engine (D) To transfer camshaft motion to the valves 18. What does the term “top dead center” (TDC) refer to in a piston engine? (A) The position of the crankshaft at the end of the power stroke (B) The position of the piston when it is at the highest point in the cylinder (C) The position of the valve when it is fully closed (D) The point where the spark plug ignites the fuel 19. What is the function of the oil pump in a piston engine? (A) To mix fuel with air (B) To circulate oil through the engine for lubrication and cooling (C) To compress the air-fuel mixture (D) To control the exhaust flow 20. Which type of piston engine uses a crankshaft that is mounted horizontally? (A) Inline (B) Radial (C) V-type (D) Opposed