Electrical Engineering MCQ Question and Answer
Electrical Engineering MCQ Question and Answer
21. The frequency of DC current
- Equal to voltage magnitude
- 0
- Double of AC frequency
- 50 HZ
22. The current flowing in a purely inductive circuit of 30 mH on application of 230 V,
50 Hz single phase supply is 24.4 A. If the frequency of the applied voltage is
increased to 100 Hz the current flowing in the same circuit will be
- 24.4 A
- 48.8 A
- 12.2 A
- 6.1 A
23. Find the total resistance when two 3 Ohm resistances are connected in parallel.
- 1.11 ohms
- 1.5 ohms
- 0.707 ohms
- 1.23 ohms
25. Off-line converter, SMPS has
- AC input and dc output
- DC input and dc output
- AC input and ac output
- None
26. Filter circuits are constructed by means of
- Diode
- Resistors
- Transformers
- Capacitor and inductors
27. Resistance of the diode is decreased when
- Forward biased
- Reverse biased
- Both forward and reverse biased
- Either a or b
28. In earlier time is used for voltage regulation.
- Diode
- Transistors
- Vacuum tubes and glow bulbs
- SMPS