Category: I.C. Engines

A. iso-octane
B. mixture of normal heptane and iso-oc-tane
C. alpha methyl napthalene
D. mixture of methane and ethane
E. mixture of paraffins and aromatics

A. the friction is high
B. the friction is unpredictable
C. the small difference in cooling water temperature or in internal friction has a disproportionate effect
D. the engine is rarely operated
E. none of the above

A. Otto cycle is more efficient than the Diesel
B. Diesel cycle is more efficient’than Otto
C. both Otto and Diesel cycles are, equally efficient
D. compression ratio has nothing to do with efficiency
E. which is more efficient would depend on engine capacity

A. air only
B. liquid fuel only
C. liquid fuel and air
D. supercharging
E. does not exist

A. peak pressure
B. rate of rise of pressure
C. rate of rise of temperature
D. peak temperature
E. rate of rise of horse-power

A. 1 : 1
B. 5 : 1
C. 10:1
D. 15 : 1
E. 20 : 1

A. 0.1 to 0.2 mm
B. 0.2 to 0.4 mm
C. 0.45 to 0.6 mm
D. 0.6 to 0.8 mm
E. 0.8 to 1 mm

A. cetane
B. mixture of cetane and alphamethyl napthalene
C. ethylene dibromide
D. mixture of aldehydes and ketones
E. mixture of cetane with tetra-ethyl lead

Which of the following is false statement?

A. piston ring and cylinder wear
B. formation of hard coating on piston skirts
C. oil sludge in the engine crank case
D. detonation
E. forms corrosive acids

A. 2-stroke engine can run in any direction
B. In 4-stroke engine, a power stroke is obtained in 4-strokes
C. thermal efficiency of 4-stroke engine is more due to positive scavenging
D. petrol engines work on otto cycle
E. petrol engines occupy more space than diesel engines for same power output