211. During idling stage, gasoline does not flow through the carburetor tube because of
A.Pressure drop
B.High pressure
C.Venturi vacuum
D.It is not desired to be passed through main tube
212. Thermal efficiency of I.C. engine on weak mixture is
A.Higher
B.Lower
C.Unaffected
D.Higher/lower depending on engine rating
213. In petrol engine the actual pressure developed compared to the predicted maximum pressure is
A.90%
B.70%
C.50%
D.25%
214. Octane number of petrol normally used in petrol engines is of the order of
A.20-30
B.40-60
C.60-70
D.80-90
215. A fuel of octane rating 85 matches the anti knock qualities of a mixture consisting of 85% and 15% respectively of
A.Iso-octane and normal heptane
B.Normal heptane and iso-octane
C.Petrol and diesel
D.Benzene and methyl alcohol
216. Octane number of petrol available from Indian refineries of the order of
A.50
B.72
C.13
D.94
217. Octane number of iso-octane is about
A.0
B.100
C.80
D.90
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