A step – down choppers can be used in___________?

Related Mcqs:

1. In current commutated DC-DC choppers, the voltage spike appears across the load when_____________?

   A. Voltage across the commutating inductances collapses
   B. The capacitance voltage adds to the supply voltage
   C. Both A. and B.
   D. None of these

2. Choppers is a_______________?

   A. AC – DC converters
   B. AC – AC converters
   C. DC – AC converters
   D. DC – DC converters

3. Single phase VSI are mainly used in___________?

   A. Power supplies
   B. Ups
   C. Multilevel configuration
   D. All of these

4. Regulator sampling PWM is usually used in___________?

   A. High power inverters
   B. Rectifiers
   C. Low power inverters
   D. Only A. and B.

5. A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is_____?

   A. 0.32
   B. 0.67
   C. 0.45
   D. 0.27

6. The average value of the output voltage in a step – down dc chopper is given by__________?

   A. V 0 = V s
   B. V 0 = D V s
   C. V 0 = V s / D
   D. V 0 = V s / ( 1 – D )

7. A PNPN device having two gates is ___________?

   A. Diac
   B. Triac
   C. SUS
   D. BCS

8. Leakage current flows through the thyristor in_________?

   A. forward blocking mode
   B. reverse blocking mode
   C. both forward and reverse blocking mode
   D. forward conduction mode

9. 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___________?

   A. 130 μs
   B. 135 μs
   C. 140 μs
   D. 145 μs

10. In ac – dc conversion, when the switch is closed then the sum of voltages around the loop is____________?

    A. Zero
    B. Non zero
    C. Equal to the sum of voltage when switch is open
    D. Twice of the voltage when switch is open