In a single phase full wave regulator feeding a resistive load, the average curr

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Question
In a single phase full wave regulator feeding a resistive load, the average current over one full cycle
Options
A. is always zero
B. cannot be zero
C. may be sometimes zero
D. is always positive

Correct Answer

is always zero

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3. Two single phase semi-converters are connected in series to form a series converter. The input is v = V_m sin ?t and a₁, a₂ are the firing angles. If a₁ = 0, the dc output voltage is
Options
A. (1 + cos a₂)
B. (2 + cos a₂)
C. (3 + cos a₂)
D. (4 + cos a₂)

5. In a series inverter
Options
A. the commutating elements carry full load current
B. the commutating elements carry upto 50% of load current
C. the commutating elements do not carry load current
D. any of the above

6. A UJT exhibits negative resistance characteristics when
Options
A. Current is less than valley current
B. Current is less than peak current
C. Current is more than peak current but less than valley current
D. None of the above

7. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
Options
A. will be less than 100 N-m
B. will be more than 100 N-m
C. may be more or less than 100 N-m depending on motor parameters
D. very small

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