Exercise: Power Electronics

Questions for: Power Electronics

Between which points does UJT exhibit negative resistance characteristics
A:
between peak and valley points
B:
before peak point
C:
after peak point
D:
after valley point
Answer: A
No answer description is available. Let's discuss.
📖
📝
💬
👁️
In a semi converter feeding a resistive load, the firing angle is a. Each thyristor conducts for
A:
p radians
B:
(p - a) radians
C:
(p + a) radians
D:
(p - 0.5 a) radians
Answer: B

The conduction is from a to p.

📖
📝
💬
👁️
A single phase fully controlled bridge rectifier is fed by a source having inductance. The output voltage during overlap period is
A:
Vm
B:
0.5 Vm
C:
zero
D:
0.5 Vm - voltage drop across inductance
Answer: C

During the period of overlap all the four thyristors conduct and load is effectively short-circuited. Output voltage is zero.

📖
📝
💬
👁️
A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is
A:
20 mH
B:
about 31 mH
C:
about 51 mH
D:
about 92 mH
Answer: B

.

📖
📝
💬
👁️
A silicon controlled switch has :
A:
2 leads
B:
3 leads
C:
4 leads
D:
5 leads
Answer: C

Anode, cathode, anode gate and cathode gate.

📖
📝
💬
👁️
Ad Slot (Above Pagination)
Quiz