The carrier which are commonly used in constant – frequency PWM is______________?

Related Mcqs:

1. In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?

   A. Multiple of two
   B. Odd multiple of three
   C. Odd multiple of five
   D. Odd multiple of seven

2. In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a___________?

   A. Linear function
   B. Non linear function
   C. Constant function
   D. None of these

3. In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

   A. Zero
   B. Switches between – 1 / 2 and + 1 / 2
   C. Switches between – 1 and + 1
   D. Switches between 0 and + 1

4. A carrier based PWM technique in CSI is composed of____________?

   A. A switching pulse generator and a shorting pulse generator
   B. A shorting pulse distributor
   C. A switching and shorting pulse combination
   D. All of these

5. In variable frequency, PWM gain

   A. Phase lead helps to increase the phase margin of the control loop
   B. Phase lag helps to increase the phase margin of the control loop
   C. Phase lead helps to decrease the phase margin of the control loop
   D. Phase lag helps to decrease the phase margin of the control loop

6. The control method used for PWM dc – dc converter is______________?

   A. Voltage mode control
   B. Current mode control
   C. Hysteric control
   D. All of these

7. Double fourier series analysis of PWM is_____________?

   A. Two dimensional functions
   B. Three dimensional functions
   C. One dimensional functions
   D. All of these

8. The transfer function of PWM is generally developed in______________?

   A. Time domain
   B. Frequency domain
   C. Either A. or B.
   D. None of these

9. The output current in PWM DC – DC converters is equal to___________?

   A. Average value of the output inductor current
   B. Product of an average inductor current and a function of duty ratio
   C. Either A. or B.
   D. None of these

10. Regulator sampling PWM is usually used in___________?

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