less than
more than
✅ The correct answer is option A.
Compressors
The compression ratio for the compressor is always __________ unity.
equal to
less than
more than
✅ The correct answer is option C.
In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone is minimum during
isothermal compression
isentropic compression
polytropic compression
none of these
✅ The correct answer is option A.
Which of the following bladings will give maximum pressure rise in a centrifugal compressor, assuming the same overall dimensions, blade inlet angle and rotational speeds ?
Forward curved blades
Backward curved blades
Radial blades
all of these
✅ The correct answer is option A.
The overall isothermal efficiency of the compressor is defined as the ratio of
work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
volume of free air delivery per stroke to the swept volume of the piston
isentropic power to th
✅ The correct answer is option B.
A closed cycle gas turbine consists of a
compressor
heating chamber
cooling chamber
all of these
✅ The correct answer is option D.
In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.
Correct
Incorrect
✅ The correct answer is option A.
In jet propulsion power unit, the inlet duct of diverging shape is used for converting kinetic energy of air into pressure energy.
TRUE
FALSE
✅ The correct answer is option A.
Which one of the following is the effect of blade shape on performance of a centrifugal compressor ?
Backward curved blades has poor efficiency
Backward curved blades lead to stable performance
Forward curved blades has higher efficiency
Forward curved blades
✅ The correct answer is option D.
In a centrifugal compressor, the ratio of the __________ to the blade velocity is called slip factor.
inlet whirl velocity
outlet whirl velocity
inlet velocity of flow
outlet velocity of flo
✅ The correct answer is option D.