The air entry velocity m a rocket as compared to aircraft is_________________?
(A) same
(B) more
(C) less
(D) zero
(D) dependent on power and speed
Propulsion efficiency of the following order-is obtained in practice _______________?
(A) 34%
(B) 50%
(C) 60%
(D) 72%
(D) 85%.
The maximum propulsion efficiency of a turbojet is attained at around following speed __________________?
(A) 550 km/hr
(B) 1050km/hr
(C) 1700 km/hr
(D) 2400km /hr
(D) 4000 km/hr
A rocket works with maximum overall efficiency when air craft velocity is equal to the_________________?
(A) jet velocity
(B) twice the jet velocity
(C) half the jet velocity
(D) average of the jet velocity
(D) no such co-relationship with jet velocity exists
In the cross compounding of the gas turbine plant__________________?
(A) h.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine
(B) h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine
(C) both the arrangements can be employed
(D) all are connected in series
(D) none of the above
Work ratio of a gas turbine plant is ratio of______________________?
(A) net work output and work done by turbine
(B) net work output and heat supplied
(C) work done by turbine and heat supplied
(D) work done by turbine and net work output
(D) actual/heat drop and isentropic heat drop
In the aircraft propellers __________________?
(A) the propulsive matter is caused to flow around the propelled body
(B) propulsive matter is ejected from within the propelled body
(C) its functioning does not depend on presence of air
(D) all of the above
(D) none of the above
Work ratio of a gas turbine may be improved by f____________________?
(A) decreasing the compression work
(B) increasing the compression work
(C) increasing the turbine work
(D) decreasing the turbine work
Reheating in gas turbine results in___________________?
(A) increase of work ratio
(B) decrease of thermal efficiency
(C) decrease of work ratio
(D) both
In which case the air-fuel ratio is likely to be maximum _________________?
(A) 2-stroke engine
(B) 4-stroke petrol engine
(C) 4-stroke diesef engine
(D) multi-cylinder engine
(D) gas turbine