Chapter: Introduction to IC Engine
1.

Advantage of reciprocating IC engines over steam turbine is

A. Mechanical simplicity
B. Improved plant efficiency
C. Lower average temperature
D. all of the above
Answer» D. all of the above
2.

The intake charge in a diesel engine consists of

A. air alone
B. air + lubricating oil
C. air + fuel
D. air + fuel + lubricating oil
Answer» A. air alone
3.

Engines of different cylinder dimensions, power and speed can be compared on the basis of

A. Maximum pressure
B. Fuel consumption
C. mean effective pressure
D. unit power
Answer» C. mean effective pressure
4.

Disadvantages of reciprocating IC engine are

A. vibration
B. use of fossil fuels
C. balancing problems
D. all of the above
Answer» D. all of the above
5.

Gudgeon pin forms the link between

A. piston and big end of connecting rod
B. piston and small end of connecting rod
C. connecting rod and crank
D. big end and small end
Answer» B. piston and small end of connecting rod
6.

In a four-stroke IC engine cam shaft rotates at

A. same speed as crankshaft
B. twice the speed of crankshaft
C. halt the speed of crankshaft
D. none of the above
Answer» C. halt the speed of crankshaft
7.

Thermal efficiency of CI engine is higher than that of SI engine due

A. light weight
B. higher compression ratio
C. constant pressure heat addition
D. none of the above
Answer» B. higher compression ratio
8.

SI engines are of

A. light weight
B. high speed
C. homogeneous change of fuel and oil
D. all of the above
Answer» D. all of the above
9.

Compression ratio in diesel engines is of the order of

A. 5-7
B. 7 -10
C. 10 – 12
D. 14-20
Answer» D. 14-20
10.

Main advantage of a two-stroke engine over four-stroke engine is

A. more uniform torque on the crankshaft
B. more power output for the cylinder of same dimensions
C. absence of valves
D. all of the above
Answer» D. all of the above
11.

Engines used for ships are normally

A. four-stroke Sl engines of very high power
B. two-stroke CI engines of very high power
C. four-stroke Cl engines of high speed
D. two-stroke SI engines of high power
Answer» B. two-stroke CI engines of very high power
12.

If L is the stroke and N is the rpm, mean piston speed of two-stroke engine

A. LN
B. LN/2
C. 2LN
D. none of the above
Answer» C. 2LN
13.

The volumetric efficiency of the SI engine is comparatively

A. lower than CI engine
B. higher than CI engine
C. will be same as CI engine
D. none of the above
Answer» A. lower than CI engine
14.

Brake specific fuel consumption is defined as

A. fuel consumption per hour
B. fuel consumption per km
C. fuel consumption per BP
D. fuel consumption per brake power hour
Answer» D. fuel consumption per brake power hour
15.

Engine can be fired with

A. solid fuel
B. liquid fuel
C. gaseous fuel
D. any of the above fuels
Answer» D. any of the above fuels
16.

A two-stroke engine can be identified by

A. cooling system
B. lubrication system
C. absence of valves
D. piston size
Answer» C. absence of valves
17.

Advantage of two-stroke engine is

A. more uniform torque
B. lighter flywheel
C. no valves
D. all of the above
Answer» D. all of the above
18.

Charge pressure at the inlet port of a two-stroke engine is

A. 20 bar
B. vacuum
C. atmospheric
D. higher than atmospheric
Answer» D. higher than atmospheric
19.

The most perfect method of scavenging is

A. cross scavenging
B. uniflow scavenging
C. loop scavenging
D. reverse flow scavenging
Answer» B. uniflow scavenging
20.

Two-stroke SI engines suffer from

A. fuel loss
B. idling difficulty
C. both (a) and (b) together
D. none of the above
Answer» A. fuel loss
21.

At the same speed two-stroke engine of the same size as a four-stroke engine will develop

A. same power
B. half the power
C. twice the power
D. four times the power
Answer» C. twice the power
22.

Two wheelers without deflector type piston use

A. loop scavenging
B. unifow scavenging
C. reverse flow scavenging
D. cross scavenging
Answer» D. cross scavenging
23.

Crankcase scavenged engines have delivery ratio of

A. greater than 1
B. less than 1
C. equal to 1
D. none of the above
Answer» C. equal to 1
24.

The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft

A. 1/2
B. 1
C. 2
D. 4
Answer» C. 2
25.

In a diesel engine, the fuel is ignited by

A. spark
B. injected fuel
C. heat resulting from compressing air that is supplied for combustion
D. ignitor
Answer» C. heat resulting from compressing air that is supplied for combustion
26.

Scavenging air in diesel engine means

A. air used for combustion sent under pres-sure
B. forced air for cooling cylinder
C. burnt air containing products of com-bastion
D. air used for forcing burnt gases out of engine's cylinder during the exhaust period
Answer» D. air used for forcing burnt gases out of engine's cylinder during the exhaust period
27.

Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?

A. yes
B. no
C. to some extent
D. unpredictable
Answer» B. no
28.

The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

A. net efficiency
B. efficiency ratio
C. relative efficiency
D. overall efficiency
Answer» C. relative efficiency
29.

Compression ratio of LC. Engines is

A. the ratio of volumes of air in cylinder before compression stroke and after compression stroke
B. volume displaced by piston per stroke and clearance volume in cylinder
C. ratio of pressure after compression and before compression
D. swept volume/cylinder volume
Answer» A. the ratio of volumes of air in cylinder before compression stroke and after compression stroke

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