In air breathing jet engine, the jet is formed by expanding__________________?
(A) gases
(B) solids
(C) liquid
(D) plasma
(D) highly heated atmospheric air
Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?
(A) 2500°C
(B) 2000°C
(C) 1500°C
(D) 1000°C
(D) 700°C
Reheating in multistage expansion gas turbine results in____________________?
(A) high thermal efficiency
(B) reduction in compressor work
(C) decrease of heat loss in exhaust
(D) maximum work output
(D) none of the above
Gas turbine cycle with Regenerator __________________?
(A) increases thermal efficiency
(B) allows high compression ratio
(C) decreases heat loss is exhaust
(D) allows operation at very high altitudes
(D) permits high moisture content fuel to be used
The main purpose of reheating in gas turbine is to__________________?
(A) increase temperature
(B) reduce turbine size
(C) increase power output
(D) increase speed
(D) increase pressure ratio
A file removes the metal during___________________?
(A) both forward and return strokes
(B) forward stroke
(C) return stroke
(D) none of these
In jet engines the products of combustion after passing through the gas lurbine are discharged into_______________?
(A) atmosphere
(B) back to the compressor
(C) discharge nozzle
(D) vacuum
(D) none of the above
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity______________?
(A) Vi=V0B
(B) Vt>V0
(C) U,<V0
(D) V,= U0
(D) Vri=Vm
The working fluid in ai turbine is___________________?
(A) in two phases
(B) in three phases
(C) in a single phase
(D) in the form of air and water mixture
(D) gas and no air
The compression ratio in a gas turbine is of the roder of____________________?
(A) 3.5 : 1
(B) 5 : 1
(C) 8 : 1
(D) 12 : 1
(D) 20 : 1