91. How many SCR are to be connected in series with 800 V rating to be used for 3 kV circuit using derating factor of 15%?
92. A single phase voltage source square wave inverter feeds pure inductive load. The waveform of the load current will be
93. A circuit uses SCR of 800 V rating after which the derating is 25% then the SCR in series
94. In a thyristor DC chopper, which type of commutation results in best performance?
95. An ideal thyristor is driving an R-L load of impedance Z. Input AC voltage Vs = Vmsinωmt. If thyristor if fired at an input phase angle of 90°. What will be the output voltage and output current across R-L load as the instant of firing?
96. A thyristor equivalent of a thyratron tube is a
97. Buck-Boost converter is one of the,
98. A single phase one pulse controlled circuit has a resistance and counter emf load 200sin(512t) as the source voltage for a load counter emf of 100 V, the range of firing angle control will be:
99. In UJT, maximum value of charging resistance is associated with
100. Match List-I with List-II and select the correct answer using the options given below:
List-I (Device)
List-II (Associated Term)
a. Diode
1. Pinch off voltage
b. SCR
2. Holding current
c. BJT
3. Forward resistance
d. FET
4. Active region
| List-I (Device) | List-II (Associated Term) |
| a. Diode | 1. Pinch off voltage |
| b. SCR | 2. Holding current |
| c. BJT | 3. Forward resistance |
| d. FET | 4. Active region |
Read More Section(Power Electronics)
Each Section contains maximum 100 MCQs question on Power Electronics. To get more questions visit other sections.