Lakshya Education MCQs

Question: In gas turbines, high thermal efficiency is obtained in
Options:
A. Closed cycle
B. Open cycle
C. Both of the above
D. Closed/open depending on other considerations
Answer: Option A
Explanation :

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More Questions on This Topic :

Question 1. The overall isothermal efficiency of compressor is defined as the ratio of
  1.     Isothermal h.p. to the BHP of motor
  2.     Isothermal h.p. to adiabatic h.p.
  3.     Power to drive compressor to isothermal h.p.
  4.     Work to compress air isothermally to work for actual compression
Answer: Option A
Explanation :
Question 2. Gas turbine blades are given a rake
  1.     Equal to zero
  2.     In the direction of motion of blades
  3.     Opposite to the direction of motion of blades
  4.     Depending on the velocity
Answer: Option B
Explanation :
Question 3. The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is
  1.     Low
  2.     High
  3.     Same
  4.     Low/high depending on make and type
Answer: Option A
Explanation :
Question 4. A gas turbine used in air craft should have
  1.     High h.p. and low weight
  2.     Low weight and small frontal area
  3.     Small frontal area and high h.p.
  4.     High speed and high h.p.
Answer: Option B
Explanation :
Question 5. Choose the correct statement
  1.     Gas turbine requires lot of cooling water
  2.     Gas turbine is capable of rapid start up and loading
  3.     Gas turbines has flat efficiency at part loads
  4.     Gas turbines have high standby losses and require lot of maintenance
Answer: Option B
Explanation :
Question 6. The maximum temperature in a gas turbine is
  1.     200°C
  2.     500°C
  3.     700°C
  4.     1000°C
Answer: Option C
Explanation :

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