Questions set 68

Cylinder Head

1.      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.

2.      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 over heating of engine.

3.      For retaining compression in the cylinder, a flat piece of ___________ is placed between the cylinder head and cylinder block.
a) gasket
b) rims
c) cylinder liner
d) invar strut
Answer: a
Explanation: Gaskets are coated with special varnish which melts and seals all the small inter sticks of the block and head when the engines warms up. The gaskets besides withstanding high pressure should also withstand high temperature also.

4.      The main advantage of using aluminium alloy for cylinder head is ____________
a) lightness in weight
b) high thermal conductivity
c) less corrosion rate
d) cost
Answer: b
Explanation: Generally cylinder heads are coated with grey cast iron and aluminium alloy. The main advantage for the aluminium alloy over the cast iron is high thermal conductivity which can withstand about 1000°C without much expansion and deformation.

5.      Inter-metallic corrosion between steel studs and aluminium alloy lead to ___________
a) engine war-up
b) higher fuel consumption
c) cylinder head stick to cylinder block
d) gaskets get damaged
Answer: c
Explanation: Due to corrosion and over heating of the engine due to the piston sliding movements up and down, the cylinder block will get attached to the cylinder block which in turns lead to total replacement of the entire engine setup.

6.      Why cylinder head cast as a separate piece?
a) good compression ratio
b) high efficiency
c) prevent collision
d) easy removal
Answer: d
Explanation: Cylinder head are casted as separate piece generally for easy removal also to provide correct provision for spark plug, injector, flow of water etc.,

7.      ____________ is combination of fibre and cork granules that is more compressible and resilient.
a) karropak
b) felicoid
c) shimbestos
d) metal sandwich
Answer: b
Explanation: Felicod is a type of pump gasket which is improvement on cork. It is less subject to shrinkage and expansion. It can also withstand considerable bending and twisting without breakage.

8.      Which of the following oil pan gaskets are not affected by oil and grease?
a) felbestos
b) metal encased
c) felcoperne
d) felicod
Answer: c
Explanation: Felcoperne is synthetic rubber compound with good resilient and compressible. It is not affected by expansion or shrinkage. Compared to other oil pan gaskets like cork and felicod felcoperene is preferred now-a-days.

9.      Which of the following is not the type of manifold gaskets?
a) felbestos
b) metal encased
c) metal embosed
d) shimbestos
Answer: d
Explanation: Shimbestos is a cylinder gaskets which is combination of thin steel heat shield on one side and a high resilient specially treated metal reinforced asbestos on the top.

10.  ____________ is attached to the bottom face of cylinder block.
a) crank case
b) oil pan
c) piston
d) cylinder liners
Answer: a
Explanation: Crank case is attached to the bottom part of the cylinder block which serves as a base of engine, which supports crankshaft and camshaft in suitable bearings also provides an arm for supporting engine on frame.

11.  The cylinder block and upper half of the crank case are cast by _________ material.
a) aluminium
b) zinc
c) semi-steel
d) titanium
Answer: c
Explanation: Semi-steel provides a strong and harder casting also good thermal conductivity, which permits thin casting walls and improving cooling.

12.  _________ serves as a cooling and ventilation of engine lubricating oil.
a) crank case
b) oil sump
c) cam shaft
d) piston
Answer: b
Explanation: Oil sump or oil pan which is bottom half of crank case it is bolted or screwed to the lower flange of main casting.