Gas turbine works on_______________?
(A) Brayton or Atkinson cycle
(B) Carnot cycle
(C) Rankine cycle
(D) Erricsson cycle
(D) Joule cycle
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
(D) unpredictable
Actual compression curve is___________________?
(A) same as isothermal
(B) same as adiabatic
(C) better than isothermal and adiabatic
(D) in between isothermal and adiabatic
(D) none of the above
The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called__________________?
(A) pressure ratio
(B) pressure coefficient
(C) degree of reaction
(D) slip factor
(D) stage factor
Surging phenomenon in centrifugal com-pressor depends on ___________________?
(A) mass flow rate
(B) pressure ratio
(C) change in load
(D) stagnation pressure at the outlet
(D) all of the above
Gas turbines for power generaion are normally used___________________?
(A) to supply base load requirements
(B) to supply peak load requirements
(C) to enable start thermal power plant
(D) in emergency
(D) when other sources of power fail
Efficiency of gas turbine is increased by________________ ?
(A) reheating
(B) inter cooling
(C) adding a regenerator
(D) all of the above
(D) none of the above
The hottest point in a gas turbine is______________________?
(A) at the base
(B) at the tip
(C) in the center
(D) between ~ to i of the blade height
(D) uniformly heated
Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is_________________?
(A) higher
(B) lower
(C) equal
(D) can’t be compared
(D) unpredictable
The pressure ratio in gas turbines is of the order of__________________?
(A) 2:l
(B) 4:1
(C) 61: 1
(D) 9 : 1
(D) 12:1.