Mechanical Engineering Mcqs

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
E. isothermal work to ideal work

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
D. fully insulating the cylinder
E. high stroke

A. at very high speed
B. at very slow speed
C. at average speed
D. at zero speed
E. isothermally

A. isothermally
B. adiabatically
C. isentropically
D. isochronically
E. as per law pV

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
E. entropy decreases