Electric Drives Practice Test 7

1. Which test is used to determine the conditions where electric motors are being used?

2. In a transistor, I_B=2 mA and I_c=3 mA. The value of β is _____________

3. In 3-Φ Semi-controlled rectifier calculate the average value of the voltage if the supply is 440 V and firing angle is 22°.

4. Full form of THD is ____________

5. The base of a transistor is lightly doped.

6. Calculate the extinction angle in purely inductive load if the firing angle is π÷4.

7. If holding current of an SCR is 6 mA then its latching current should be ___________

8. Calculate the displacement factor if the fundamental voltage is 24sin(140πt-240°) and fundamental current is 47sin(140πt-120°).

9. In a transistor, β=75 and I_c=53 mA. The value of I_B is _____________

10. Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 90°.