Water is injected in gas turbine cycle to___________________?
(A) control temperature
(B) control output of turbine
(C) control fire hazards
(D) increase efficiency
(D) it is never done
The closed cycle in gas turbines_________________?
(A) provides greater flexibility
(B) provides lesser flexibility
(C) in never used
(D) is used when gas is to be burnt
(D) none of the above
The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the_____________________?
(A) adiabatic temperature drop in the stage
(B) total temperature drop
(C) total temperature drop in the stage
(D) total adiabaitc temperature drop
(D) difference of maximum and minimum temperature in the cycle
A gas turbine used in air craft should have______________________?
(A) high h.p. and low weight
(B) low weight and small frontal area
(C) small frontal area and high h.p.
(D) high speed and high h.p.
(D) all of the above
Producer gas is produced by_____________________?
(A) carbonisation of coal
(B) passing steam over incandescent coke
(C) passing air and a large amount of steam over waste coal at about 65°C
(D) partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
(D) same way as the natural gas
For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________?
(A) pressure ratio alone
(B) maximum cycle temperature alone
(C) minimum cycle temperature alone
(D) both pressure ratio and maximum cycle temperature
(D) none of the above
Propulsive efficiency is defined as ratio of___________________?
(A) thrust power and fuel energy
(B) engine output and propulsive power
(C) propulsive power and fuel input
(D) thrust power and propulsive power
(D) none of the above
A rocket engine for the combustion of its fuel_____________________?
(A) carries its own oxygen
(B) uses surrounding air
(C) uses compressed atmospheric air
(D) does not require oxygen
(D) depends on electrical energy supplied by solar cells
Which of the following fuels can be used in turbojet engines _____________________?
(A) liquid hydrogne
(B) high speed diesel oil
(C) kerosene
(D) demethylated spirit
(D) methyl alcohol
A jet engine works on the principle of conservation of____________________?
(A) mass
(B) energy
(C) flow
(D) linear momentum
(D) angular momentum