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Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.
Increases
Decreases
Remains the same
None of these
Increases
Decreases
Remains the same
None of these
Answer
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Power Electronics
The maximum di/dt in a SCR is
Inversely proportional to supply voltage.
Directly proportional to inductance in the circuit.
Directly proportional to supply voltage.
Both A and B.
Inversely proportional to supply voltage.
Directly proportional to inductance in the circuit.
Directly proportional to supply voltage.
Both A and B.
Answer
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Power Electronics
Materials used in heat sink should have
high thermal conductivity.
large surface area.
high melting point.
All of these.
high thermal conductivity.
large surface area.
high melting point.
All of these.
Answer
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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be
0.002 A.
0.004 A.
0.01 A.
0.009 A.
0.002 A.
0.004 A.
0.01 A.
0.009 A.
Answer
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Power Electronics
SCR will be turned off when anode current is
less than holding current.
< latching current but greater than holding current and gate signal is present.
< latching current but greater than holding current and gate signal is 0.
both (A) and (B).
less than holding current.
< latching current but greater than holding current and gate signal is present.
< latching current but greater than holding current and gate signal is 0.
both (A) and (B).
Answer
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Power Electronics
Thyristor can be protected from over voltages by using
heat sink.
fuse.
voltage clamping device.
snubber circuit.
heat sink.
fuse.
voltage clamping device.
snubber circuit.
Answer
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