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Compressors, Gas Dynamics and Gas Turbines problems

  • 1. Gas turbine as compared to internal combustion engine

  • Options
  • A. can be driven at a very high speed
  • B. produces uniform torque
  • C. has more efficiency
  • D. all of these
    • Discuss
  • 2. In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

  • Options
  • A. diffuser inlet radius
  • B. diffuser outlet radius
  • C. impeller inlet radius
  • D. impeller outlet radius
    • Discuss
  • 3. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.

  • Options
  • A. True
  • B. False
    • Discuss
  • 4. If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

  • Options
  • A. D1/D2 = (p1p3)1/2
  • B. D1/D2 = (p1/p3)1/4
  • C. D1/D2 = (p1p3)1/4
  • D. D1/D2 = (p3/p1)1/4
    • Discuss
  • 5. The air is delivered __________ in one revolution in case of a three-lobbed rotor.

  • Options
  • A. two times
  • B. three times
  • C. four times
  • D. six times
    • Discuss
  • 6. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.

  • Options
  • A. Agree
  • B. Disagree
    • Discuss
  • 7. In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.

  • Options
  • A. Agree
  • B. Disagree
    • Discuss
  • 8. A receiver in compressor installations is used to damp pressure waves in compressor discharge.

  • Options
  • A. Yes
  • B. No
    • Discuss
  • 9. A gas turbine used in air-craft should have low weight and small frontal area.

  • Options
  • A. Correct
  • B. Incorrect
    • Discuss
  • 10. A jet engine has

  • Options
  • A. no propeller
  • B. propeller in front
  • C. propeller at back
  • D. propeller on the top
    • Discuss

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