Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
The purpose of governing in steam turbines is to
Options- A. maintain the speed of the turbine
- B. reduce the effective heat drop
- C. reheat the steam and improve its quality
- D. completely balance against end thrust
- Correct Answer
- maintain the speed of the turbine
- 1. Rateau turbine is
Options- A. simple reaction turbine
- B. velocity compounded turbine
- C. pressure compounded turbine
- D. pressure-velocity compounded turbine Discuss
- 2. In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
Options- A. velocity increases
- B. velocity decreases
- C. velocity remains constant
- D. pressure remains constant Discuss
- 3. Reheating of steam in a turbine
Options- A. increases the workdone through the turbine
- B. increases the efficiency of the turbine
- C. reduces wear on the blades
- D. all of these Discuss
- 4. In a De-Laval impulse turbine, the nozzle is kept very close to the blades.
Options- A. Yes
- B. No Discuss
- 5. When the nozzle operates with the maximum mass flow, the nozzle is said to be
Options- A. choked
- B. underdamping
- C. overdamping
- D. none of these Discuss
- 6. When the cross-section of a nozzle increases continuously from entrance to exit, it is called a
Options- A. divergent nozzle
- B. convergent nozzle
- C. convergent-divergent nozzle
- D. none of these Discuss
- 7. A steam nozzle converts
Options- A. heat energy of steam into kinetic energy
- B. kinetic energy into heat energy of steam
- C. heat energy of steam into potential energy
- D. potential energy into heat energy of steam Discuss
- 8. The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 ?, where ? is the nozzle exit flow angle, if the
Options- A. blades are equiangular
- B. blade velocity coefficient is unity
- C. blades are equiangular and frictionless
- D. blade solidity is 0.65 Discuss
- 9. The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.
Options- A. same as
- B. 2 times
- C. 4 times
- D. 8 times Discuss
- 10. The flow of steam is super-sonic
Options- A. at the entrance to the nozzle
- B. at the throat of the nozzle
- C. in the convergent portion of the nozzle
- D. in the divergent portion of the nozzle Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: pressure compounded turbine
Correct Answer: velocity decreases
Correct Answer: all of these
Correct Answer: Yes
Correct Answer: choked
Correct Answer: divergent nozzle
Correct Answer: heat energy of steam into kinetic energy
Correct Answer: blades are equiangular and frictionless
Correct Answer: 8 times
Correct Answer: in the divergent portion of the nozzle
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