IndiaBIX

Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 2
21.
The number of doped regions in a SCR is
2
3
4
5
Answer: Option
Explanation:

p = n = p = n.

22.
All inverters use forced commutation.
True
False
Answer: Option
Explanation:

Line commutated inverters are also used especially in HVDC.

23.
In 180° mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.
True
False
Answer: Option
Explanation:

In 180° mode three thyristors conduct simultaneously.

24.
In a single phase full wave ac regulator the rms value of load current is 20 A load is purely resistive. Then
average thyristor current will be less than 20 A but rms thyristor current will be more than 20 A
both the average and rms thyristor currents will be less than 20 A
both the average and rms thyristor currents will be more than 20 A
rms thyristor current will be 20 A and average thyristor current will be 10 A
Answer: Option
Explanation:

Each thyristor conducts for 50% of time.

25.
A reactor is used in a dual converter operating in non-circulating current mode.
True
False
Answer: Option
Explanation:

Reactor is used only for circulating current mode.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers