881. The efficiency and work ratio of a simple gas turbine cycle are
A. low
B. very low
C. high
D. very high

882. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
A. specific heat at constant volume
B. specific heat at constant pressure
C. kilo Joule
D. none of these

883. A Francis turbine is used when the available head of water is
A. 0 to 25 m
B. 25 m to 250 m
C. above 250 m
D. none of these

884. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
A. slow speed with radial flow at outlet
B. medium speed with radial flow at outlet
C. high speed with radial flow at outlet
D. high speed with axial flow at outlet

885. A hydraulic coupling belongs to the category of
A. power absorbing machines
B. power developing machines
C. energy transfer machines
D. energy generating machines

886. An adiabatic process is one in which
A. no heat enters or leaves the gas
B. the temperature of the gas changes
C. the change in internal energy is equal to the mechanical workdone
D. all of the above

887. Which of the following is the lightest and most volatile liquid fuel?
A. Gasoline
B. Kerosene
C. Fuel oil

888. The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as
A. normal speed
B. unit speed
C. specific speed
D. none of these

889. For centrifugal pump impeller, the maximum value of the vane exit angle is
A. 10° to 15°
B. 15° to 20°
C. 20° to 25°
D. 25° to 30°

890. Manometric head, in case of a centrifugal pump, is equal to
A. Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
B. Workdone per kN of water – Losses within the impeller
C. Energy per kN at outlet of impeller – Energy per kN at inlet of impeller
D. all of the above

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