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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 4
36.
A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then
Pdc = Pac for all values of firing angles
Pdc = Pac if firing angle is less than 180°
Pdc < Pac for all values of firing angles
Pdc < Pac if firing angle is less than 180°
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Which of the following devices exhibit negative resistance characteristics?
UJT
PUT
Both UJT and PUT
UJT, PUT and SBS
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be
less than mechanical or thermal time constant of the system
more than the mechanical or thermal time constant of the system
more or less than the mechanical or thermal time constant
very high
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation
has the same peak thyristor current as in 120° mode of operation
has higher peak thyristor current than in 120° mode of operation
has lower peak thyristor current than in 120° mode of operation
any of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
As compared to BJT, MOSFET has
lower switching losses and higher conduction losses
higher switching losses and higher conduction losses
higher switching losses and lower conduction losses
lower switching losses and lower conduction losses
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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