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MCQs

Total Questions : 765 | Page 4 of 77 pages
Question 31. A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.
  1.    Same
  2.    Lower
  3.    Higher
  4.    None of these
 Discuss Question
Answer: Option C. -> Higher
Question 32. Aeroplanes employ following type of compressor
  1.    Radial flow
  2.    Axial flow
  3.    Centrifugal
  4.    None of the above
 Discuss Question
Answer: Option B. -> Axial flow
Question 33. The following property is most important for material used for gas turbine blade
  1.    Toughness
  2.    Fatigue
  3.    Creep
  4.    Corrosion resistance
 Discuss Question
Answer: Option C. -> Creep
Question 34. The main purpose of reheating in gas turbine is to
  1.    Increase temperature
  2.    Reduce turbine size
  3.    Increase power output
  4.    Increase speed
 Discuss Question
Answer: Option C. -> Increase power output
Question 35. In the cross compounding of the gas turbine plant
  1.    H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
  2.    H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
  3.    Both the arrangements can be employed
  4.    All are connected in series
 Discuss Question
Answer: Option B. -> H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
Question 36. 1 m of air at atmospheric condition weighs approximately
  1.    0.5 kg
  2.    1.0 kg
  3.    1.3 kg
  4.    2.2 kg
 Discuss Question
Answer: Option C. -> 1.3 kg
Question 37. The advantage of multistage compression over single stage compression is
  1.    Lower power consumption per unit of air delivered
  2.    Higher volumetric efficiency
  3.    Decreased discharge temperature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 38. A simple turbojet engine is basically
  1.    A propeller system
  2.    Gas turbine engine equipped with a propulsive nozzle and diffuse
  3.    Chemical rocket engine
  4.    Ramjet engine
 Discuss Question
Answer: Option B. -> Gas turbine engine equipped with a propulsive nozzle and diffuse
Question 39. The efficiency of a jet engine is higher at
  1.    Low speeds
  2.    High speeds
  3.    Low altitudes
  4.    High altitudes
 Discuss Question
Answer: Option D. -> High altitudes
Question 40. The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
  1.    Rotor to static enthalpy rise in the stator
  2.    Stator to static enthalpy rise in the rotor
  3.    Rotor to static enthalpy rise in the stage
  4.    Stator to static enthalpy rise in the stage
 Discuss Question
Answer: Option C. -> Rotor to static enthalpy rise in the stage

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