A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is 30° to 180°. 60° to 180°. 60° to 120°. 30° to 150°. TRUE ANSWER : ? YOUR ANSWER : ?
A power semiconductor may undergo damage due to Low dv/dt. Low di/dt. High di/dt. High dv/dt. TRUE ANSWER : ? YOUR ANSWER : ?
After proper turn on of thyristor None of these gate signal is always present. gate signal must be removed. gate signal should present but can be removed. TRUE ANSWER : ? YOUR ANSWER : ?
Which semiconductor device acts like a diode and two transistor? Diac. Triac. SCR. UJT. TRUE ANSWER : ? YOUR ANSWER : ?
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR? 3.2 µs 3.1 µs 3.3 µs 3 µs. TRUE ANSWER : ? YOUR ANSWER : ?
Snubber circuit is used with SCR either series or parallel. anti parallel. in parallel. in series. TRUE ANSWER : ? YOUR ANSWER : ?
COOLMOS device can be used in application up to power range of 100 KVA. 2 KVA. 500 VA. 1 KVA. TRUE ANSWER : ? YOUR ANSWER : ?
A GTO can be turned on by applying Positive drain signal. None of these. Positive source signal. Positive gate signal. TRUE ANSWER : ? YOUR ANSWER : ?
By which one of the following we can measure the reliability of a string? Derating factor. String efficient. Reliability factor. Factor of safety. TRUE ANSWER : ? YOUR ANSWER : ?
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________. Increases Remains the same Decreases None of these TRUE ANSWER : ? YOUR ANSWER : ?