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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 4
11.
A 3 phase fully controlled bridge converter is fed by a 3 phase system having phase voltage v = Vm sin ωt. The firing angle is a. The dc output voltage is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Which of these commutation methods uses an external pulse for commutation?
Class A
Class C
Class E
Class F
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
In a single phase full wave regulator feeding an R-L load, the power factor angle of load is θ. The range of control of firing angle a is
0 ≤ a ≤ p
θ ≤ a ≤ p
0 ≤ a ≤ (p - θ)
θ ≤ a ≤ (p + θ)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be
0.9
0.8
0.75
0.6
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
A relaxation oscillator uses
tunnel diode
UJT
both tunnel diode and UJT
PIN diode
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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