Electronics and Communication Engineering - Power Electronics

1. 

In a semi converter feeding a resistive load

A. the waveshapes of output voltage and output current are exactly similar
B. the waveshapes of output voltage and output current can not be similar
C. the waveshapes of output voltage and output current are similar only for low values of firing angle
D. the waveshapes of output voltage and output current may be similar or dissimilar

Answer: Option A

Explanation:

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2. 

In an n stage high frequency series inverter having a time period T, each stage is active for a time interval of

A. T
B.
C.
D.

Answer: Option B

Explanation:

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3. 

In a 3 phase semiconverter, the output voltage becomes discontinuous for

A. firing angle > 30°
B. firing angle > 60°
C. firing angle > 90°
D. firing angle > 120°

Answer: Option B

Explanation:

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4. 

A single phase fully controlled bridge converter is feeding an RLE load. Input voltage is Vm sin ωt and firing angle is a. If average current is I0, then

A. cos a = RI0 + E
B. cos a = RE0 + E
C. cos a = E0 - RI0
D. cos a = E - RI0

Answer: Option A

Explanation:

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5. 

In integral cycle control of ac regulator, the input power factor is equal to

A. duty cycle a
B. a2
C. a
D. (a)1/3

Answer: Option C

Explanation:

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