Mechanical Engineering Mcqs
As a result of detonation in an I.C. engine, following parameter attains very high value _____________________?

A. Peak pressure
B. Rate of rise of pressure
C. Rate of rise of temperature
D. Peak temperature

Most high speed compression engines operate on __________________?

A. Diesel cycle
B. Otto cycle
C. Dual combustion cycle
D. Special type of air cycle

In a typical medium speed, 4-stroke cycle diesel engine ___________________?

A. Fuelinjection starts at 10° before to dead center and ends at 20° after tor dead center
B. Fuel injection starts at top dead center and ends at 20° after top dead center
C. Fuel injection starts at just before top dead center and ends just after top deac center
D. May start and end anywhere

The rating of a diesel engine, with increase in airintlet temperature, will ___________________?

A. Increase linearly
B. Decrease linearly
C. Increase parabolically
D. Decrease parabolically

A heat engine utilises the_________________?

A. Calorific value of oil
B. Low heat value of
C. High heat value of oil
D. Mean heat value of oil

Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?

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

The term scavenging is generally associated with______________________?

A. 2-stroke cycle engines
B. 4-stroke cycle engines
C. aeroplane engines
D. diesel engines

The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?

A. 1500 rpm
B. 750 rpm
C. 3000 rpm
D. Any value independent of engine speed