Mechanical Engineering MCQs

A. Mechanical efficiency
B. Volumetric efficiency
C. Isothermal efficiency
D. Adiabatic efficiency

A. As large as possible
B. As small as possible
C. About 50% of swept volume
D. About 100% of swept volume

A. 20-30%
B. 40-50%
C. 60-70%
D. 70-90%

A. Increases with increase in compression ratio
B. Decreases with increase in compression ratio
C. Is not dependent upon compressin ratio
D. May increase/decrease depending on compressor capacity

A. The ratio of stroke volume to clearance volume
B. The ratio of the air actually delivered to the amount of piston displacement
C. Reciprocal of compression ratio
D. Index of compressor performance

A. Gauge discharge pressure to the gauge intake pressure
B. Absolute discharge pressure to the ab-solute intake pressure
C. Pressures at discharge and suction cor-responding to same temperature
D. Stroke volume and clearance volume

A. Compression index
B. Compression ratio
C. Compressor efficiency
D. Mean effective pressure

A. Increases
B. Decreases
C. Remains same
D. Increases/decreases depending on com-pressor capacity

A. to accommedate valves in the cylinder head
B. to provide cushioning effect
C. to attain high volumetric efficiency
D. to avoid mechanical bang of piston with cylinder head

A. Increases with increase in compression ratio
B. Decreases with increase in compression ratio
C. In not dependent upon compression ratio
D. May increase/decrease depending on compressor capacity