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.Management Sciences
Category: Compressors, Gas Turbines and Jet Engines
It is not possible to use closed gas turbine cycle in aeronautical engines because_________________ ?
A. it is inefficient
B. it is bulky
C. it requires cooling water for its operation
D. non of theses
Separators in compressor installations are located_____________________?
A. before intercooler
B. after intercooler
C. after receiver
D. between after-cooler and air receiver
E. before suction
Free air is the air at________________?
A. atmospheric conditions at any specific location
B. 20°C and 1 kg/cm2 and relative humidity of 36%
C. 0°C and standard atmospheric conditions
D. 15°C and 1 kg/cm2
E. 25°C, 1 kg/cm2 and relative humidity of 50%.
The pressure ratio of an ideal vaned compressor with increase in mass flow rate_________________?
A. increases
B. decreases
C. remains constant
D. first decreases and then increases
E. unpredictable
Euler’s equation is applicable for__________________?
A. centrifugal compressor
B. axial compressor
C. pumps
D. all of the above
E. none of the above
The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?
A. 0.1%
B. 0.5%
C. 1.0%
D. 5%
E. 10%.
Efficiency of gas turbine is increased by________________ ?
A. reheating
B. inter cooling
C. adding a regenerator
D. all of the above
E. none of the above
The volumetirc efficiency of a compressor is calculated on the basis of __________________?
A. volume of air inhaled at working conditions
B. volume of air inhaled at N.T.P. conditions
C. volume at 0°C and 1 kg/cm2
D. volume at 20°C and 1 kg/cm2
E. none of the above
The blades of gas turbine are made of_________________?
A. mild steel
B. stainless steel
C. carbon steel
D. high alloy seel
E. high nicket alloy (neimonic)
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
E. 700°C
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