Quiz on Physics Set 122

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Quiz on Physics Set 122 :

Question 1 : 

Kilowatt -hour is the unit of:
A. Force
B. Energy
C. Momentum
D. Power

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Correct Ans: Option B

Question 2 : 

In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle
A. is zero
B. is 60°
C. is more than 60°
D. is more than 90°

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Correct Ans: Option C

Question 3 : 

A single phase full converter can operate in
A. 4 quadrants
B. 3 quadrants
C. 2 quadrants
D. 1 quadrant

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Correct Ans: Option C

Question 4 : 

In a 3 phase bridge inverter with 180° mode of operation the numbers of thyristors conducting at one time are
A. 1
B. 2
C. 3
D. 4

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Correct Ans: Option C

Question 5 : 

Which of these commutation methods uses an external pulse for commutation?
A. Class A
B. Class C
C. Class E
D. Class F

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Correct Ans: Option C

Question 6 : 

McMurray Bedford full bridge inverter uses
A. natural commutation
B. auxiliary commutation
C. complementary commutation
D. any of the above

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Correct Ans: Option C

Question 7 : 

In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected
A. True
B. False
C. none
D. all

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Correct Ans: Option B

Question 8 : 

Natural commutation can be used in :
A. DC circuits only
B. AC circuits only
C. both AC and DC circuits
D. none of the above

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Correct Ans: Option B

Question 9 : 

In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current
A. are always similar
B. can never be similar
C. may be similar or dissimilar
D. are similar only if  = 0

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Correct Ans: Option A

Question 10 : 

A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35
A. rectification efficiency will be more than 0.6 and TUF will be more than 0.35
B. rectification efficiency will be more than 0.6 but TUF will be less than 0.35
C. rectification efficiency will be less than 0.6 and TUF will be less than 0.35
D. rectification efficiency will be less than 0.6 but TUF will be more than 0.35

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Correct Ans: Option A

Quiz Summary

Here the correct answers of every question in this quiz.

Q.1 [B],     Q.2 [C],     Q.3 [C],     Q.4 [C],     Q.5 [C],     Q.6 [C],     Q.7 [B],     Q.8 [B],     Q.9 [A],     Q.10 [A],    


Total Questions: 10
Your score:
Subject: Physics
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