Mechanical Engineering Mcqs | Thermodynamics |
A. temperature during compression remains constant
B. no heat leaves or enters the compressor cylinder during cornpression
C. temperature rise follows a linear relationship
D. work done is maximum
A. isothermally
B. adiabatically
C. isentropically
D. isochronically
A. at very high speed
B. at very slow speed
C. at average speed
D. at zero speed
A. 0.5 kg
B. 1.0 kg
C. 1.3 kg
D. 2.2 kg
A. isothermal h.p. to the BHP of motor
B. isothermal h.p. to adiabatic h.p.
C. power to drive compressor to isothermal h.p.
D. work to compress air isothermally to work for actual compression
A. atmospheric
B. slightly more than atmospheric
C. slightly less than atmospheric
D. pressure slightly more than atmospheric and temperature slightly less than atmospheric
Isothermal compression efficiency, even when running at high speed, can be approached by using
A. multi-stage compression
B. cold water spray
C. both A. and B. above
A. atmospheric conditions at any specific location
B. 20°C and 1 kg/cm2 and relative humidity of 36%
C. 0°C and standard atmospheric conditions
D. 15°C and 1 kg/cm2
A. standard air
B. free air
C. compressed air
D. compressed air at delivery pressure
A. isothermal
B. adiabatic
C. polytropic
D. any one of the above