Power Electronics mcq objective questions and answers part1

Q1. The performance of engines of different HP, RPM and sizes can be compared on the basis of
(A) specific fuel consumption
(B) compression ratio
(C) clearance volume
(D) cylinder volume

Q2. Overall efficiency of gas turbine is
(A) equal to Rankine cycle efficiency
(B) equal to Carnot cycle efficiency
(C) more than Otto or Diesel cycle efficiency
(D) less than Diesel cycle efficiency

Q3. Maximum efficiency of an open cycle gas turbine is nearly
(A) 30.00%
(B) 40.00%
(C) 0.6
(D) 80%.

Q4. The artificial draught normally is designed to produce
(A) less smoke
(B) more draught
(C) less chimney gas temperature
(D) all of the above

Q5. The draught in locomotive boilers is produced by
(A) forced fan
(B) chimney
(C) steam jet
(D) only motion of locomotive

Q6. The modern steam turbines are
(A) impulse turbines
(B) reaction turbines
(C) impulse-reaction turbines
(D) none of the above

Q7. Economiser is used to heat
(A) air
(B) feed water
(C) flue gases
(D) all of these

Q8. In regenerative cycle feed water is heated by
(A) exhaust gases
(B) heaters
(C) draining steam from the turbine
(D) all of these

Q9. In a piston the maximum temperature occurs at
(A) ring section
(B) gudgeon pin
(C) top sides
(D) top center.

Q10. The overall efficiency of thermal power plant is equal to
(A) Rankine cycle efficiency
(B) Carnot cycle efficiency
(C) Regenerative cycle efficiency
(D) All of these

Q11. In fuel cell
(A) mechanical energy is converted into electrical energy
(B) chemical energy is converted into electrical energy
(C) heat energy is converted into electrical energy
(D) sound energy is converted into electrical energy

Q12. The main source of production of biogas is
(A) human waste
(B) wet cow dung
(C) wet livestock waste
(D) all of these

Q13. A two stroke engine may be identified by
(A) piston size
(B) absence of valves
(C) cooling system
(D) lubrication system

Q14. Air standard efficiency of a diesel engine depends on
(A) compression ratio
(B) speed
(C) fuel
(D) torque.

Q15. Cetane number of high speed diesel available in market is
(A) 100
(B) 80 to 90
(C) 60 to 75
(D) 45 to 55

Q16. Rankine efficiency of a steam power plant
(A) improves in summer as compared to that in winter
(B) improves in winter as compared to that in summer
(C) is unaffected by climatic conditions
(D) none of the above

Q17. Which one is the proper indication of incomplete combustion
(A) high CO content in flue gases at exit
(B) high CO2 content in flue gases at exit
(C) high temperature of flue gases
(D) the smoking exhaust from chimney

Q18. Equipment used for pulverizing the coal is known as
(A) Ball mill
(B) Hopper
(C) Burner
(D) Stoker.

Q19. Which option represents the commercial sources of energy
(A) solar, wind and biomass
(B) fossil fuels, hydropower and nuclear energy
(C) wood, animal wastes and agriculture wastes
(D) none of the above

Q20. Select the conventional source of energy?
(A) Tidal power
(B) Geothermal energy
(C) Nuclear energy
(D) Wind power.