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Gas Turbines And Jet Engines
Questions
The compression ratio for the compressor is always _________ unity.
ক
Equal to
খ
Less than
গ
More than
ঘ
None of these
The hottest point in a gas turbine is
ক
At the base
খ
At the tip
গ
In the center
ঘ
Between ~ to i of the blade height
Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is
ক
Higher
খ
Lower
গ
Equal
ঘ
Can't be compared
The maximum temperature in a gas turbine is
ক
200°C
খ
500°C
গ
700°C
ঘ
1000°C
In a jet propulsion
ক
The propulsive matter is ejected from within the propelled body
খ
The propulsive matter is caused to flow around the propelled body
গ
Its functioning does not depend upon presence of air
ঘ
None of the above
The fuel consumption in gas turbines is accounted for by
ক
Lower heating value
খ
Higher heating value
গ
Heating value
ঘ
Higher calorific value
The indicated work per unit mass of air delivered is
ক
Directly proportional to clearance volume
খ
Greatly affected by clearance volume
গ
Not affected by clearance volume
ঘ
Inversely proportional to clearance volume
Which of the following plants is smallest and lightest for generating a given amount of power?
ক
Gas turbine plant
খ
Petrol engine
গ
Diesel engine
ঘ
Solar plant
In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of
ক
Vacuum
খ
Atmospheric air
গ
Compressed air
ঘ
Oxygen alone
Gas turbine blades are given a rake
ক
Equal to zero
খ
In the direction of motion of blades
গ
Opposite to the direction of motion of blades
ঘ
Depending on the velocity
Water gas is produced by
ক
passing steam over red hot coke
খ
passing steam and air over red hot coke
গ
burning coke in excess of air
ঘ
burning coke in limited supply of air
In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the
ক
Thrust and range of aircraft
খ
Efficiency of the engine
গ
Both (A) and (B)
ঘ
None of these
A compressor at high altitudes will require ________ power.
ক
Same
খ
Less
গ
More
ঘ
None of these
In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into
ক
Atmosphere
খ
Vacuum
গ
Discharge nozzle
ঘ
Back to the compressor
In jet engines the products of combustion after passing through the gas turbine are discharged into
ক
Atmosphere
খ
Back to the compressor
গ
Discharge nozzle
ঘ
Vacuum
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