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MCQs

Total Questions : 1935 | Page 100 of 194 pages
Question 991.

 
The action of steam in a steam turbine is


  1.    static
  2.    dynamic
  3.    static and dynamic
  4.    neither static nor dynamic
 Discuss Question
Answer: Option B. -> dynamic


Question 992.

The Parsons' reaction turbine has


  1.    only moving blades
  2.    only fixed blades
  3.    identical fixed and moving blades
  4.    fixed and moving blades of different shape
 Discuss Question
Answer: Option C. -> identical fixed and moving blades


Question 993.

 
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop


  1.    remains the same
  2.    increases
  3.    decreases
  4.    is unpredictable
 Discuss Question
Answer: Option C. -> decreases


Question 994.


The discharge is __________ at critical pressure.


  1.    zero
  2.    minimum
  3.    maximum
 Discuss Question
Answer: Option C. -> maximum


Question 995.

Thermal equilibrium means that the flow of steam is


  1.    isothermal
  2.    isentropic
  3.    hyperbolic
  4.    polytropic
 Discuss Question
Answer: Option B. -> isentropic


Question 996.

 
The ratio of the workdone on the blades to the energy supplied to the blades, is called


  1.    blading efficiency
  2.    nozzle efficiency
  3.    gross or stage efficiency
  4.    mechanical efficiency
 Discuss Question
Answer: Option A. -> blading efficiency


Question 997.

 
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be


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


Question 998.

 
The reheat factor is the ratio of the


  1.    cumulative heat drop to the isentropic heat drop
  2.    isentropic heat drop to the heat supplied
  3.    total useful heat drop to the total isentropic heat drop
  4.    none of the above
 Discuss Question
Answer: Option A. -> cumulative heat drop to the isentropic heat drop


Question 999.

The turbine blades do not change the direction of steam issuing from the nozzle.


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


Question 1000.

 
De-Laval turbine is a


  1.    single rotor impulse turbine
  2.    multi-rotor impulse turbine
  3.    mpulse reaction turbine
  4.    none of these
 Discuss Question
Answer: Option A. -> single rotor impulse turbine


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