A. pressure ratio
B. pressure coefficient
C. degree of reaction
D. slip factor
E. stage factor
Related Mcqs:
- There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
A. remain same
B. decrease
C. increase
D. unpredictable
E. none of the above - For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?
A. increase
B. decrease
C. remain unaffected
D. other factors control it
E. unpredictable - Gas turbine blades are given a rake___________________?
A. equal to zero
B. in the direction of motion of blades
C. opposite to the direction of motion of blades
D. depending on the velocity
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) - 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 - The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?
A. increase first at fast rate and then slow
B. increase first at slow rate and then fast
C. decrease continuously
D. first increase, reach maximum and then decrease
E. none of the above - Pressure ratio in gas turbines is the ratio of ____________________?
A. compressor pressure ratio
B. highest pressure to exhaust pressure
C. inlet pressure to exhaust pressure
D. pressures across the turbine
E. none of the above - The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?
A. slip factor
B. velocity factor
C. velocity coefficient
D. blade effectiveness - Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm . The air pressure will be_____________________ ?
A. 1.03 kg/cm2
B. 1.06 kg/cm2
C. 1.00 kg/cm2
D. 0.53 kg/cm2
E. 0.5 kg/cm2 - The thrust on the rotor in a centrifugal compressor is produced by________________?
A. radial component
B. axial component
C. tangential component
D. resultant component
