941. The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
A. Boyle’s law
B. Charles’ law
C. Gay-Lussac law
D. all of these

942. The fire tubes in a Scotch marine boiler are
A. horizontal
B. vertical
C. inclined

943. The power of a boiler may be defined as
A. the ratio of heat actually used in producing the steam to the heat liberated in the furnace
B. the amount of water evaporated or steam produced in kg per kg of fuel burnt
C. the amount of water evaporated from and at 100° C into dry and saturated steam
D. the evaporation of 15.653 kg of water per hour from and at 100° C

944. When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as
A. internally fired boiler
B. externally fired boiler
C. natural circulation boiler
D. forced circulation boiler

945. The function of a safety valve is
A. to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
B. to indicate the water level inside the boiler to an observer
C. to measure pressure of steam inside the steam boiler
D. none of the above

946. The fire tubes in a Cochran boiler are
A. horizontal
B. vertical
C. inclined

947. A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly
A. 1.05
B. 2.86
C. 6.65
D. 10.05

948. The aim of a compound steam engine is
A. to reduce the ratio of expansion in each cylinder
B. to reduce the length of stroke
C. to reduce the temperature range in each cylinder
D. all of the above

949. The average operating pressure of Benson boiler is
A. 100 bar
B. 150 bar
C. 200 bar
D. 250 bar

950. The diameter of Cornish boiler varies from
A. 0.5 to 1 m
B. 1 to 2 m
C. 1.25 to 2.5 m
D. 2 to 3 m

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