Top 80+ Solved Turbo Machines MCQ Questions Answer
Q. Which of the following is a positive displacement rotory compressor?
a. Roots blower
b. Centrifugal compressor
c. Axial flow compressor
d. All of the above
Q. In which of the following heat exchanger, heat is extracted from air?
a. Regenerator
b. Reheater
c. Intercooler
d. All of the above
Q. The following property is the most important for material used for gas turbine blades
a. Fatigue
b. Strength against bending
c. Strength against direct force
d. Group
Q. Which of the following fluid can be used in binary vapour cycle?
a. Mercury
b. Diphenyl oxide
c. Aluminium bromide
d. any of the above
Q. In a reheating gas turbine cycle, reheating is done
a. by gases from turbine exhaust
b. by gases from intercooler
c. in separate combustion chamber
d. any of the above
Q. The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called
a. Blade efficiency
b. Diagram efficiency
c. slip factor
d. Velocity ratio
Q. Thermal efficiency of a gas turbine is in the range
a. 20 to 30 percent
b. 40 to 50 percent
c. 50 to 60 percent
d. 30 to 40 percent
Q. Basic closed cycle for gas turbine is
a. Carnot cycle
b. Rankine cycle
c. Brayton cycle
d. none of the above
Q. The advantage of a gas turbine over a reciprocating engine is
a. perfect balancing of rotor
b. continuous and uniform power
c. usually small working pressures
d. all of the above
Q. A diffuser is used to
a. increase velocity and decrease pressure
b. increase velocity as well as pressure
c. decrease velocity as well as pressure
d. decrease velocity and increase pressure
Q. Which of the following steam turbine has identical fixed and moving blades?
a. Curtis turbine
b. Rateau turbine
c. Parson's turbine
d. none of the above
Q. Bleeding in steam turbine refers to
a. purposely withdrawn steam for process application
b. leakage of steam through bearings
c. purposely withdrawn for feed water heating
d. leakage of steam through packings