Top 80+ Solved Turbo Machines MCQ Questions Answer
Q. For a jet prepulsion unit, ideally the compressor work and turbine work are
a. unequal
b. equal
c. not related to each other
d. none of the above
Q. Stalling of the blades of axial flow compressor is
a. an unsteady periodic and reversal of flow
b. the fixed mass flow rate regardless of pressure ratio
c. the reduction in lift force at higher angle of incidence
d. none of the above
Q. In a two stage gas turbine plant reheating after first stage
a. increases thermal efficiency
b. decreases thermal efficiency
c. doesoes not affect thermal efficiency
d. none of the above
Q. In a nozzle if back pressure is equal to inlet pressure
a. maximum flow occurs
b. no flow occurs
c. flow is subsonic in diverging section
d. flow is supersonic in converging as well as supersonic sections
Q. The source of power for driving a turbocharger is
a. chemical energy of exhaust gases
b. air motor
c. kinetic energy of exhaust gases from the engine
d. electric motor
Q. The diverging portion of the nozzle acts as a diffuser for
a. the subsonic flow
b. the supersonic flow
c. both the subsonic as well as supersonic flow
d. none of the above
Q. Efficiency of gas turbine is increased by
a. Reheating
b. Intercooling
c. Adding a regenerator
d. All of the above
Q. Curtis turbine is
a. a velocity pressure compounded turbine
b. a velocity compounded turbine
c. in impulse turbine
d. a pressure compounded turbine
Q. Which of the following is a pressure compounded turbine?
a. Parson's turbine
b. Curtis turbine
c. Rateau turbine
d. All of the above
Q. The work ratio of closed cycle gas turbine plant with fixed top temperature of the cycle and fixed pressure ratio rp
a. increases with increase in an inlet temperature to compressor
b. increases with decrease in an inlet temperature to compresor
c. remain same irrespective of inlet temperature to compressor
d. none of the above
Q. In an axial flow compressor, the pressure rise occurs in
a. fixed blades only
b. Moving blades only
c. Both fixed and moving blades
d. none of the above
Q. Surging is
a. an unsteady, periodic and reversal of flow in the compressor
b. the fixed mass flow rate regardless of pressure ratio
c. the reduction in lift force at higher angles of incidence
d. none of the above
Q. A regenerator can be used on
a. open cycle gas turbines only
b. closed cycle gas turbines only
c. both open as well as closed cycle gas turbines
d. none of the above
Q. Maximum delivery pressure in a rotary air compressor is of the order of
a. 10 KSC
b. 16 KSC
c. 6 KSC
d. 25 KSC
Q. An axial flow compressor has
a. smaller blades at gas entry and larger blades at exit
b. identical dlades at exit as well as entry
c. larger blades at gas entry and smaller blades at exit
d. size of blades remains same only angles changes