[A]. D1/D2 = p1p2
[B]. D1/D2 = p1/p2
[C]. D1/D2 = p2/p1
[D]. none of these
✅ The correct answer is option C.
Compressors
When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
[A]. equal to
[B]. less than
[C]. more than
null
✅ The correct answer is option A.
Only rocket engines can be propelled to space because
[A]. they can generate very high thrust
[B]. they have high propulsion efficiency
[C]. these engines can work on several fuels
[D]. they are not air-breathing engines
✅ The correct answer is option D.
A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
[A]. same
[B]. lower
[C]. higher
null
✅ The correct answer is option C.
A rotary compressor is driven by an
electric motor
engine
either (a) or (b)
none of these
✅ The correct answer is option C.
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called
compressor efficiency
volumetric efficiency
isothermal efficiency
mechanical efficiency
✅ The correct answer is option D.
The ratio of workdone per cycle to the stroke volume of the compressor is known as
compressor capacity
compression ratio
compressor efficiency
mean effective pressure
✅ The correct answer is option D.
The rotary compressors are suitable for large discharge of air at low pressure.
TRUE
FALSE
✅ The correct answer is option A.
The increase in pressure in a vane blower takes place first due to compression and then due to back flow of air.
Correct
Incorrect
✅ The correct answer is option A.
Rotary compressors are used for delivering
small quantities of air at high pressures
large quantities of air at high pressures
small quantities of air at low pressures
large quantities of air at low pressures
✅ The correct answer is option D.