Session 2: Engine and Its Components
Unit 3: Major Systems and Components of anAutomobile
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. The engine is the ………….. of an automobile. Its role is veryimportant.
Ans: heart
2. The engine converts the Chemical Energy (heat energy) to…………….. Energy.
Ans: mechanical
3. Major parts of the engine are ………….., …………….., and …………….
Ans: cylinder, piston, crankshaft
4. The function of the carburettor is to supply uniform ………………….. to the cylinder of a ……………. through the intake manifold.
Ans: air-fuel mixture, spark ignition engine
5. Sparkplug is used to ………………..
Ans: ignite the air-fuel mixture
B. Multiple choice questions
1. The compression-ignition engine air is compressed so that itstemperature goes up to ……………..
(a) 538 °C (1000 °F) or higher
(b) 348 °C
(c) 2480 °C
(d) None of the above
Ans: (a) 538 °C (1000 °F) or higher
2. The cylinder of an IC engine is generally made of …………………
(a) cast iron
(b) copper
(c) iron
(d) fibre
Ans: (a) cast iron
3. The charge (fuel and air mixture for SI engine and only air forCI engine) enters through the …………….
(a) inlet valve
(b) spark plug
(c) outlet valve
(d) piston
Ans: (a) inlet valve
4. The heart of the engine is the ……………..
(a) piston
(b) cylinder head
(c) connecting rod
(d) All of the above
Ans: (a) piston
C. Short answer questions
1. Explain the role of the engine and its components.
Ans: The engine produces power to run the vehicle by converting chemical energy of fuel into mechanical energy. Its main components such as cylinder, piston, crankshaft, valves, carburettor, and spark plug work together togenerate and transmit power to the wheels.
2. Explain the difference between a compression ignition engineand a spark ignition engine.
Ans: In a compression ignition engine, only air is compressed to a hightemperature and fuel ignites automatically without a spark. In a spark ignitionengine, a mixture of air and fuel is ignited by a spark plug to produce power.
