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MCQs

Total Questions : 1935 | Page 93 of 194 pages
Question 921.

 
The ratio of the
energy supplied to the blades per kg of steam to the total energy
supplied per stage per kg of steam is called mechanical efficiency.


  1.    Yes
  2.    No
 Discuss Question
Answer: Option B. -> No


Question 922.

 
The maximum discharge of steam through a convergent-divergent nozzle depends upon


  1.    area of nozzle at throat
  2.    initial pressure and volume of steam
  3.    final pressure ofsteam leaving the nozzle
  4.    both (a) and (b)
 Discuss Question
Answer: Option D. -> both (a) and (b)


Question 923.

 
In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,


  1.    velocity increases
  2.    velocity decreases
  3.    velocity remains constant
  4.    pressure remains constant
 Discuss Question
Answer: Option B. -> velocity decreases


Question 924.


The friction in the nozzle __________ exit velocity of steam.


  1.    has no effect on
  2.    decreases
  3.    increases
 Discuss Question
Answer: Option B. -> decreases


Question 925.


A stage, in reaction turbine, is represented by


  1.    number of casing
  2.    number of entries of steam
  3.    number of exits of steam
  4.    each row of blades
 Discuss Question
Answer: Option D. -> each row of blades


Question 926.

 
When the nozzle operates with the maximum mass flow, the nozzle is said to be


  1.    choked
  2.    underdamping
  3.    overdamping
  4.    none of these
 Discuss Question
Answer: Option A. -> choked


Question 927.

 
In a reaction turbine


  1.    the steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
  2.    the expansion of steam takes place partly in the fixed blades and partly in the moving blades
  3.    the steam is expanded from a high pressure to a condenser pressure in one or more nozzles
  4.    the steam is expanded from a high pressure to a condenser pressure in one or more nozzles
 Discuss Question
Answer: Option B. -> the expansion of steam takes place partly in the fixed blades and partly in the moving blades


Question 928.

 
The nozzle efficiency is the ratio of


  1.    workdone on the blades to the energy supplied to the blades
  2.    workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
  3.    energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
  4.    none of the above
 Discuss Question
Answer: Option C. -> energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam


Question 929.


The pressure of steam, in reaction turbines, is reduced in the fixed blades as well as in moving blades.


  1.    Correct
  2.    Incorrect
 Discuss Question
Answer: Option A. -> Correct


Question 930.

 
Blading efficiency is also known as


  1.    stage efficiency
  2.    diagram efficiency
  3.    nozzle efficiency
  4.    none of these
 Discuss Question
Answer: Option B. -> diagram efficiency


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