The overall isothermal eiffciency of compressor is defined as the ratio of_______________?
(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
(D) isothermal work to ideal work
The pressure and temperature conditions of air at the suction of compressor are_________________?
(A) atmospheric
(B) slightly more than atmospheric
(C) slightly less than atmospheric
(D) pressure slightly more than atmospheric and temperature slightly less than atmospheric
(D) pressure sightly less than atmospheric and temperature slightly more than atmospheric
Isothermal compression effeicency can be attained by running the compressor__________________?
(A) at very high speed
(B) at very slow speed
(C) at average speed
(D) at zero speed
(D) isothermally
The- most efficient method of compressing air is to compress it_________________?
(A) isothermally
(B) adiabatically
(C) isentropically
(D) isochronically
(D) as per law pV
Adiabatic compression is one in which___________________?
(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
(D) entropy decreases
In a forced vortex, the velocity of flow everywhere within the fluid is__________________?
(A) maximum
(B) minimum
(C) zero
(D) non-zero finite
(D) unpredictable
For pipes, laminar flow occurs when Roynolds number is__________________?
(A) less than 2000
(B) between 2000 and 4000
(C) more than 4000
(D) less than 4000
(D) none of the above
The fluid forces considered in the Navier Stokes equation are__________________?
(A) gravity, pressure and viscous
(B) gravity, pressure and turbulent
(C) pressure, viscous and turbulent
(D) gravity, viscous and turbulent
(D) none of the above
All the terms of energy in Bernoulli’s equation have dimension of_______________?
(A) energy
(B) work
(C) mass
(D) length
(D) time
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
(D) two isobaric, two adiabatic and one constant volume