Electric Power Generation(Engineering > Electrical Engineering ) Questions and Answers
Question 1. A p-type semiconductor material is doped with ____________ impurities whereas a n-type semiconductor material is doped with __________ impurities
acceptor, donor
acceptor, acceptor
donor, donor
donor, acceptor
Explanation:-
Answer: Option A. -> acceptor, donor
Donor impurities denote an electron to the n-type material making it a electron majority carrier & vice-versa.
Question 2. The p-region has a greater concentration of __________ as compared to the n-region in a P-N junction.
holes
electrons
both holes & electrons
phonons
Explanation:-
Answer: Option A. -> holes
Holes are the majority charge carriers in p-type material.
Question 3. In the p & n regions of the p-n junction the _________ & the ___________ are the majority charge carriers respectively.
holes, holes
electrons, electrons
holes, electrons
electrons, holes
Explanation:-
Answer: Option C. -> holes, electrons
Holes are the majority charge carriers in p-type material & vice-versa.
Question 4. In regenerative cycle, bled steam is
discharged to atmosphere
condensed in steam condenser
used to beat feed water for boiler
is mixed with steam supplied to turbine
Explanation:-
Answer: Option C. -> used to beat feed water for boiler
used to beat feed water for boiler
Question 5. Which of the following is not the voltage at which power is usually transmitted
132 kV
66 kV
33 kV
20 kV
Explanation:-
Answer: Option D. -> 20 kV
20 kV
Question 6. Overall thermal efficiency of a steam power station is in the range
18-24%
30-40%
44-62%
68-79%
Explanation:-
Answer: Option A. -> 18-24%
18-24%
Question 7. Most of the generators in thermal power plants run at
3000 rpm
1500 rpm
1000 rpm
750 rpm
Explanation:-
Answer: Option A. -> 3000 rpm
3000 rpm
Question 8. What is the maximum size of steam turbine usually being installed, for thermal power plants ?
120 MW
250 MW
500 MW
1000 MW
Explanation:-
Answer: Option C. -> 500 MW
500 MW
Question 9. Which of the following, is not a high pressure boiler ?
Loeffler boiler
Lancashire boiler
Velox boiler
Lamont boiler
Explanation:-
Answer: Option B. -> Lancashire boiler
Lancashire boiler
Question 10. Permissible pH value of water for boilers is