101. A jet engine has
no propeller
propeller in front
propeller at back
propeller on the top
✅ The correct answer is option A.
Compressors, Gas Dynamics and Gas Turbines MCQs
102. Standard air is the air at __________ and relative humidity of 36 percent.
0.1 bar and 20° C
1 bar and 20° C
0.1 bar and 40° C
1 bar and 40° C
✅ The correct answer is option B.
103. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.
Agree
Disagree
✅ The correct answer is option B.
104. The multi-stage compression ofair as compared to single stage compression
improves volumetric efficiency for the given pressure ratio
reduces workdone per kg of air
gives more uniform torque
all of these
✅ The correct answer is option D.
105. A compressor mostly used for supercharging of I.C. engines is
radial flow compressor
axial flow compressor
roots blower
reciprocating compress
✅ The correct answer is option A.
106. 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.
107. 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.
108. 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.
109. A closed cycle gas turbine consists of a
compressor
heating chamber
cooling chamber
all of these
✅ The correct answer is option D.
110. In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.
Correct
Incorrect
✅ The correct answer is option A.