A single phase fully controlled bridge converter is fed by a voltage Vm sin ?t.

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A single phase fully controlled bridge converter is fed by a voltage V_m sin ?t. The average and rms values of output voltage are
Options
A.
B.
C. cos a and V_m
D. cos a and 2 V_m

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2. A single phase semiconverter is feeding a highly inductive load and has a freewheeling diode across the load. The waveshape of input current is
Options
A. sinusoidal
B. rectangular
C. sinusoidal or rectangular
D. triangular

3. In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th₁ and Th₂ respectively are
Options
A. 0 to p and p to 2p
B. a to p and p + a to 2p
C. a to p + a and p + p to 2p + a
D. a to p - a and p + a to 2p - a

4. A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are V_s and I_s. Output dc power is V_dc I_dc and output ac power is (V_rms ) (I_rms), Transformer utilisation factor TUF is
Options
A.
B.
C.
D.

6. In a bridge inverter
Options
A. an output transformer is essential
B. an output transformer is not essential
C. an output transformer cannot be connected
D. an output transformer, if used, can improve the efficiency of the circuit

7. In a modified series inverter with two inductors and two capacitors, the load current
Options
A. has 2 parallel paths
B. has only one parallel path
C. can have three parallel paths
D. has four parallel paths

9. An ideal rectifier should have
Options
A. 100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor
B. 100% efficiency, zero tipple factor, zero harmonic factor and zero displacement factor
C. 100% efficiency, zero ripple factor, unity harmonic factor and unity displacement factor
D. 100% efficiency, unity ripple factor, zero harmonic factor and unity displacement factor

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