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MCQs

Total Questions : 116 | Page 1 of 12 pages
Question 1. A p-type semiconductor material is doped with ____________ impurities whereas a n-type semiconductor material is doped with __________ impurities
  1.    acceptor, donor
  2.    acceptor, acceptor
  3.    donor, donor
  4.    donor, acceptor
 Discuss Question
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.
  1.    holes
  2.    electrons
  3.    both holes & electrons
  4.    phonons
 Discuss Question
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.
  1.    holes, holes
  2.    electrons, electrons
  3.    holes, electrons
  4.    electrons, holes
 Discuss Question
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
  1.    discharged to atmosphere
  2.    condensed in steam condenser
  3.    used to beat feed water for boiler
  4.    is mixed with steam supplied to turbine
 Discuss Question
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
  1.    132 kV
  2.    66 kV
  3.    33 kV
  4.    20 kV
 Discuss Question
Answer: Option D. -> 20 kV


20 kV


Question 6. Overall thermal efficiency of a steam power station is in the range
  1.    18-24%
  2.    30-40%
  3.    44-62%
  4.    68-79%
 Discuss Question
Answer: Option A. -> 18-24%


18-24%


Question 7. Most of the generators in thermal power plants run at
  1.    3000 rpm
  2.    1500 rpm
  3.    1000 rpm
  4.    750 rpm
 Discuss Question
Answer: Option A. -> 3000 rpm


3000 rpm


Question 8. What is the maximum size of steam turbine usually being installed, for thermal power plants ?
  1.    120 MW
  2.    250 MW
  3.    500 MW
  4.    1000 MW
 Discuss Question
Answer: Option C. -> 500 MW


500 MW


Question 9. Which of the following, is not a high pressure boiler ?
  1.    Loeffler boiler
  2.    Lancashire boiler
  3.    Velox boiler
  4.    Lamont boiler
 Discuss Question
Answer: Option B. -> Lancashire boiler


Lancashire boiler


Question 10. Permissible pH value of water for boilers is
  1.    1
  2.    7
  3.    slightly more than 7
  4.    10
 Discuss Question
Answer: Option C. -> slightly more than 7


slightly more than 7


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