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MCQs

Total Questions : 1935 | Page 99 of 194 pages
Question 981.
 
The turbine blades are
  1.    straight
  2.    circular
  3.    curved
 Discuss Question
Answer: Option C. -> curved


Question 982.
 
Parson's reaction turbine is a __________ reaction turbine.
  1.    40 percent
  2.    50 percent
  3.    60 percent
  4.    70 percent
 Discuss Question
Answer: Option B. -> 50 percent


Question 983.


In a De-Laval
nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure
at the minimum cross-section (i. e. pressure at throat, p2) will be


  1.    3.3 bar
  2.    5.46 bar
  3.    8.2 bar
  4.    9.9 bar
 Discuss Question
Answer: Option B. -> 5.46 bar


Question 984.

 
In reaction turbines, the axial thrust is due to


  1.    pressure drop across the rotor
  2.    change in axial velocity
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a) and (b)


Question 985.

 
Which of the following statement is correct?


  1.    The expansion of steam in a nozzle follows Rankine cycle.
  2.    The friction in the nozzle increases the dryness fraction of steam.
  3.    The pressure of steam at throat is called critical pressure.
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above


Question 986.

 
A binary vapour plant consists of


  1.    steam turbine
  2.    steam condenser
  3.    mercury boiler
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these


Question 987.

 
Multi-stage steam turbines are of the


  1.    velocity compounded type
  2.    reaction type
  3.    pressure compounded type
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these


Question 988.


The blade
velocity coefficient is ratio of relative velocity of steam at outlet
tip of the blade to the relative velocity of steam at inlet tip of the
blade.


  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True


Question 989.


The steam leaves the nozzle at a


  1.    high pressure and a low velocity
  2.    high pressure and a high velocity
  3.    low pressure and a low velocity
  4.    low pressure and a high velocity
 Discuss Question
Answer: Option D. -> low pressure and a high velocity


Question 990.

 
The critical pressure gives the velocity of steam at the throat


  1.    equal to the velocity of sound
  2.    ess than the velocity of sound
  3.    more than the velocity of sound
  4.    none of these
 Discuss Question
Answer: Option A. -> equal to the velocity of sound


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