21. Which one of the following is used to bring down the speed of an impulse steam turbine to practical limits?
A. A gearbox
B. A large flywheel
C. Compounding of the turbine
D. A centrifugal governor
22. An impulsive turbine produces 50 kW of power when the blade’s mean speed is 400 m/s. The rate of change of momentum tangential to the rotor-
A. 125 N
B. 150 N
C. 175 N
D. 200 N
23. When are shock waves formed in air compressor-
A. Mach Number < 0.9
B. Mach Number > 0.9
C. Mach Number = 2
D. Mach Number changes suddenly from one value to another
24. In which one of the following steam turbines, steam is taken from various points along the turbine, solely for feed-water heating-
A. Bleeder turbine
B. Extraction turbine
C. Reheat turbine
D. Regenerative turbine
25. With natural Uranium which of these is used as a moderator?
A. Heavy water
B. Beryllium
C. Graphite
D. All of these