134. The most popular firing order in case of four cylinder in-line I.C. engine is
A.1-2-3-4
B.1-3-4-2
C.1-4-2-3
D.1-2-4-3

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135. The compression ratio of motor cars is
A.5
B.7
C.10
D.13

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136. The specific gravity of diesel oil is
A.1
B.0.7
C.0.85
D.0.5

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137. Freezing temperature of petrol is usually
A.0°C
B.-10°C
C.10°C
D.Less than -30°C

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138. Pick up 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.

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139. The efficiency of I.C. engines normally is of the order of
A.15-20%
B.20-25%
C.25-30%
D.30-35%

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140. The firing order in a six stroke I.C. engine is
A.1-3-6-5-2-4
B.1-5-3-4-2-6
C.1-6-2-5-4-3
D.1-5-2-6-3-4

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