1. A separate _______ crankcase would result in saving weight also enabling cheaper and quick replacement.
a) nickel
b) chromium
c) iron
d) aluminium

Answer: d
Explanation: Aluminium is of lighter weight and is easily available in the market so which can be replaced easily with comparatively lower price.

2. Which of the following isn’t a cylinder block part?
a) cylinder in which piston slides up and down
b) openings for valves
c) passages for flow of cooling water
d) carburettor

Answer: d
Explanation: Carburettor isn’t a part of cylinder block it is used for mixture of fuel and air and then allowed to the intake port.

3. In some small engines, the cylinder walls are plated with __________ to reduce wall wear and increase the service life.
a) grey cast iron
b) steel sleeves
c) chromium
d) nickel

Answer: c
Explanation: Chromium a very hard metal with high coefficient of thermal expansion so used to reduce wall wear and to promote service life.

4. Which of the following is advantage for aluminium alloy cylinder block over grey cast iron?
a) density
b) machinability
c) co-efficient of thermal expansion
d) thermal conductivity

Answer: a
Explanation: Density of aluminium is one-third of cast iron and it is a light weight material which is advantage over cast iron.

5. By which relation speed of piston can be calculated inside cylinder block?
(L-Length of stoke, D-Diameter, N-speed of engine)
a) 2LDN
b) 2LN
c) 2πLD
d) 2πL

Answer: b
Explanation: Because in cylinder block when piston oscillates up and down it takes twice the length(to and fro) and with speed the engine rotates so it is 2LN.

6. Bubbles of air in radiator is sign of _________ problem.
a) cracked block
b) blown head gasket
c) seized block
d) lack of engine oil

Answer: b
Explanation: Bubbles of air in radiator is sign of blown head gasket which is a rare case occurring in cylinder head for which remedy is replacement of gasket, which requires an elevated platform for lifting engine.

7. Spark plug are mounted inside ________
a) cylinder block
b) cylinder head
c) crank case
d) piston

Answer: b
Explanation: Spark plugs are mounted inside cylinder head because it is consists of combustion chamber and sometimes valves(I and F-head) are also mounted.

8. Which of the following provides passages for flow of cooling water?
a) cylinder block
b) cylinder head
c) crank case
d) piston

Answer: b
Explanation: Since cylinder head only consists of the combustion chamber which in turn connects with the cooling water passages for cooling down of the engine or to prevent the overheating of engine.