Mechanical Engineering MCQs

2075 MCQs  (Page 2 of 208)

The compressor capacity with decrease in suction temperature_________________?
A. Increases
B. Decreases
C. Remains unaffected
D. May increase or decrease depending on compressor capacity
Standard air is the air at_____________________?
A. Atmospheric conditions at any specific location
B. 20°c and 1 kg/cm2 and relative humidity 36%
C. 0°c and standard atmospheric conditions
D. 15°c and 1 kg/cm2
Inter cooling in compressors__________________?
A. Cools the delivered air
B. Results in saving of power in compressing a given volume to given pressure
C. Is the standard practice for big compressors
D. Enables compression in two stages
Isothermal compression though most efficient, but is not -practicable because_________________?
A. Ityrequires very big cylinder
B. It does not increase pressure much
C. It is impossible in practice
D. Compressor has to run at very slow speed to achieve it
An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?
A. One adiabatic, two isobaric, and one constant volume
B. Two adiabatic and two isobaric
C. Two adiabatic, one isobaric and one constant volume
D. One adiabatic, one isobaric and two constant volume
An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?
A. One adiabatic, two isobaric, and one constant volume
B. Two adiabatic and two isobaric
C. Two adiabatic, one isobaric and one constant volume,
D. One adiabatic, one isobaric and two constant volume
Compression efficiency is compared against_____________________?
A. ideal compression
B. adiabatic compression
C. botii isothermal and adiabatic compression
D. isentropic compression
Aeroplanes employ following type of compressor_______________?
A. Radial flow
B. Axial flow
C. Centrifugal
D. Combination of above