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Mechanical Engineering Mcqs

Gas turbine works on_______________?

  • (A)  Brayton or Atkinson cycle
  • (B)  Carnot cycle
  • (C)  Rankine cycle
  • (D)  Erricsson cycle
  • (E)  Joule cycle
Submitted By :Ali Uppal


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
Submitted By :Ali Uppal


Actual compression curve is___________________?

  • (A)  same as isothermal
  • (B)  same as adiabatic
  • (C)  better than isothermal and adiabatic
  • (D)  in between isothermal and adiabatic
  • (E)  none of the above
Submitted By :Ali Uppal


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
  • (E)  stage factor
Submitted By :Ali Uppal


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
  • (E)  all of the above
Submitted By :Ali Uppal


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
  • (E)  when other sources of power fail
Submitted By :Ali Uppal


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
Submitted By :Ali Uppal


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
  • (E)  uniformly heated
Submitted By :Ali Uppal


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
  • (E)  unpredictable
Submitted By :Ali Uppal


The pressure ratio in gas turbines is of the order of__________________?

  • (A)  2:l
  • (B)  4:1
  • (C)  61: 1
  • (D)  9 : 1
  • (E)  12:1.
Submitted By :Ali Uppal