The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is 145 μs. 135 μs. 140 μs. 130 μs. TRUE ANSWER : ? YOUR ANSWER : ?
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is 0.27. 0.67. 0.45. 0.32. TRUE ANSWER : ? YOUR ANSWER : ?
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is 3.714. 60. 65. 37.14. TRUE ANSWER : ? YOUR ANSWER : ?
A diac is simply ___________. A triac without gate terminal A single junction device A three junction device None of these TRUE ANSWER : ? YOUR ANSWER : ?
If holding current of a thyristor is 2 mA then latching current should be 0.004 A. 0.009 A. 0.01 A. 0.002 A. TRUE ANSWER : ? YOUR ANSWER : ?
BCT is used for Low power current control. High power phase control. Low power phase control. High power current control. TRUE ANSWER : ? YOUR ANSWER : ?
The UJT may be used as ___________. A rectifier Am amplifier None of these A sawtooth generator TRUE ANSWER : ? YOUR ANSWER : ?
During gate recovery time charge carriers of J2 junction is swept out. charge carriers of J2 junction recombined. charge carrier of J1 junction removed. charge carriers of J3 junction is removed. TRUE ANSWER : ? YOUR ANSWER : ?
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be 4, 6. 6, 4. 5, 7. 7, 5. TRUE ANSWER : ? YOUR ANSWER : ?
ON state voltage drop across SCR lie between the range 0 - 0.5 V. 0.5 - 1 V. 1 - 1.5 V. 1.5 - 2 V. TRUE ANSWER : ? YOUR ANSWER : ?