Questions set 67

Cylinder Block

1.      _________ serve as a support and enclosure for moving parts.
a) cylinder block
b) cylinder head
c) crank case
d) connecting rod
Answer: a
Explanation: Because cylinder block is outer body of the engine which encloses all other parts like piston, connecting rod etc.

2.      In modern engines cylinder block and crank case forms a single casting because _________
a) reduces space consumption
b) rigid structure
c) wearing properties
d) can withstand high temperature
Answer: b
Explanation: Cylinder block and crank case are made of single casting to make them a rigid structure since they should withstand high temperature and to have good wear properties.

3.      _______ are cast in crankcase to give extra strength and to support camshaft bearings.
a) rocker arm
b) oil filter
c) rims
d) manifolds
Answer: c
Explanation: Since rims forms/gives an outer layer for crankcase they are used besides they too have high wear properties.

4.      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.

5.      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.

6.      Cylinder block is usually made from _________
a) grey cast iron
b) steel sleeves
c) nickel
d) chromium
Answer: a
Explanation: Since cylinder block has to withstand more sliding of piston the material should be good in wearing properties so grey cast iron material is used for cylinder block.

7.      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.

8.      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.

9.      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.

10.  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.