Electric Drives Practice Test 8

1. SCR is unipolar.

2. Calculate the value of the fundamental displacement factor for 1-Φ Full wave bridge rectifier if the firing α=17°.

3. Displacement factor depends upon the shape of the waveform.

4. In single phase RLE load, calculate the voltage across the thyristor when current decays to zero using the data: (V_s)_r.m.s=340 V, f=50 Hz, R=2 Ω, E=150 V, β=160°.

5. Calculate the circuit turn-off time for Half-wave controlled rectifier for a ω=5 rad/sec for resistive load.

6. Calculate the conduction angle in purely inductive load if the firing angle is 165°.

7. Which one of the following load is suitable for lagging power factor load in Single phase Half-bridge inverter?

8. Calculate the value of V_peak if crest factor=47 and V_r.m.s=6 V.

9. Calculate the r.m.s value of diode current in 1-Φ Full wave semi-converter for the load (Highly inductive) current=.2 A and α=74°. (F.D configuration)

10. The conduction period of diode in Half-wave uncontrolled rectifier for resistive load is ______________