A. Cetane and n- heptane
B. Cetane and α- methyl naphthalene
C. Cetane and isocetane
D. Tetraethyl lead and cetane
Ans-: B
Q.2 In diesel engine, pistons are usually cooled by __ .
A. Water
B. Fuel oil
C. Lubricating oil
D. Air
Ans-: C
Q.3 Which device is used to reduce exhaust noise ?
A. Exhaust manifold
B. Filter
C. Tail pipe
D. Muffler
Ans-: D
Q.4 Cetane number is the measure of _____ .
A. Ignition quality
B. Viscosity of fuel
C. Additions in fuel
D. Density of fuel
Ans -: A
Q.5 What is the freezing temperature of the petrol engine?
A. - 20 to - 10 ° C
B. 50 to - 30 ° C
C. - 10 to - 4 ° C
D. 40 to 100 ° C
Ans -: B
Q.6 Which test is done to determine the mechanical efficiency of multi-cylinder engines ?
A. Air flow test
B. Fuel consumption test
C. Morse test
D. Power test
Ans -: C
Q.7 The percentage of CO (carbon monoxide) in exhaust gases in the compression ignition engine is ?
A. 10 to 20 %
B. 5 to 10 %
C. Zero
D. 10 to 12 %
Ans -: C
Q.8 High speed diesel engines need a cetane number of ____ .
A. 100
B. 50
C. 75
D. 25
Ans -: B
Q.9 If diesel is fed by mistake in the oil tank of petrol engine , then engine will __ .
A. Knock
B. Detonate
C. Not run
D. Give lot of smoke
Ans -: C
Q.10 Which type of carburettor is preferred .
A. Vertical type
B. Horizontal type
C. Eccentric type
D. Concentric type
Ans -: D
Q.11 The compression ratio of motor car is ____.
A. 7
B. 5
C. 10
D. 15
Ans-: A
Q.12 The knocking tendency in a S.I. engine can be reduced by increasing _______ .
A. Compression ratio of fuel
B. Speed
C. Lubricating oil quality
D. None of these
Ans -: B
Q.13 What is HUCR ?
A. Highest useful compression ratio
B. Highest useful compression radiation
C. A lubricating device
D. None of these
Ans -: A
Q.14 Most high speed compression engines oprate on _____ .
A. Otto cycle
B. Dual cycle
C. Carnot cycle
D. Four stroke cycle
Ans -: B
Q.15 Piston rings are usually made of which material ?
A. Carbon steel
B. Aluminium
C. Cast iron
D. High speed steel
Ans -: C
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