1. Carbon residue in diesel oil should not be more than ___________
a) 1%
b) 0.5%
c) 0.1%
d) 0.01%
Explanation: Carbon residue in diesel oil should not be more than 0.1%
2. Which is the most popular firing order in the case of four cylinder in-line I.C. engine?
a) 1-2-3-4
b) 1-3-2-4
c) 1-4-2-3
d) 1-3-4-2
Explanation: 1-3-4-2
3. What is the compression ratio of motor cars?
a) 5
b) 7
c) 10
d) 13
Explanation: 7
4. What is the specific gravity of diesel oil?
a) 1
b) 0.7
c) 0.85
d) 0.5
Explanation: 0.85
5. Freezing temperature of petrol is about ___________
a) 0.65
b) 0.75
c) 0.85
d) 0.95
Explanation: 0.75
6. Choose the correct statement, detonation can be controlled by ___________
a) varying compression ratio
b) using lean mixture
c) retarding the spark timing
d) reducing the r.p.m
Explanation: Detonation can be controlled by retarding the spark timing.
7. The efficiency of I.C. engines normally is of the order of ___________
a) 15-20%
b) 20-25%
c) 25-30%
d) 30-35%
Explanation: 30-35%
8. What is the firing order of a six stroke I.C. engine?
a) 1-3-6-5-2-4
b) 1-4-2-5-6-3
c) 1-6-2-5-4-3
d) 1-5-3-4-2-6
Explanation: The firing order of a six stroke I.C. engine is 1-5-3-4-2-6 and the firing order in the case of four cylinder in-line I.C. engine is 1-3-4-2.
9. Sulphur content in diesel engine oil should not be more than ___________
a) 10%
b) 5%
c) 1%
d) 0.1%
Explanation: Sulphur content in diesel engine oil should not be more than 1%
10. The ash content in diesel oil should not be more than ___________
a) 1%
b) 5%
c) 0.1%
d) 0.01%
Explanation: The ash content in diesel oil should not be more than 0.01% while sulphur content in diesel engine oil should not be more than 1%.