McMurray Bedford full bridge inverter uses natural commutation auxiliary commuta

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

Correct Answer

complementary commutation

Power Electronics problems

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1. In a stud mounted SCR, the stud is
Options
A. in thermal contact with heat sink
B. insulated from heat sink
C. in electrical and thermal contact with heat sink
D. in either electrical or thermal contact with heat sink

2. Assertion (A): A GTO circuit is more compact than SCR circuit
Reason (R): A GTO can be turned off by negative gate pulse.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

3. A single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is v = V_m sin ?t. The thyristor will conduct
Options
A. from 0 to 180�
B. when v > 50 V
C. from 0 to 90�
D. When v < 50 V

4. In a 3 phase semiconverter, the dc output voltage for a certain firing angle is 50% of the maximum possible value. The firing angle is
Options
A. 30�
B. 60�
C. 90�
D. 120�

5. A thyristor has internal power dissipation of 40W and is operated at an ambient temperature of 20�C. If thermal resistance is 1.6� C/W, the junction temperature is
Options
A. 114�C
B. 164�C
C. 94� C
D. 84� C

6. In a single phase full wave regulator feeding an R-L load, the power factor angle of load is ?. The range of control of firing angle a is
Options
A. 0 ? a ? p
B. ? ? a ? p
C. 0 ? a ? (p - ?)
D. ? ? a ? (p + ?)

7. If a step down chopper is fed by a dc voltage V with T_on and T_off are on and off periods then is
Options
A. average output voltage
B. rms output voltage
C. average or rms output voltage depending on load
D. neither of the above

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