Electrical power output in a d.c. generator is equal to____________?

Related Mcqs:

1. Electrical power output in a D.C. generator is equal to_____________?

   A. Electrical power developed in armature – copper losses
   B. Mechanical power input – iron and friction losses
   C. Electrical power developed in armature – iron and copper losses
   D. Mechanical power input – iron and friction losses – copper losses

2. In a full wave rectifier, the rectification ratio is approximately equal to____________?

   A. 61%
   B. 71%
   C. 81%
   D. 91%

3. A power semiconductor may undergo damage due to____________?

   A. High di/dt
   B. High dv/dt
   C. Low di/dt
   D. Low dv/dt

4. The main objective of static power converters is to____________?

   A. Obtain an dc output waveform from a dc power supply
   B. Obtain an ac output waveform from a dc power supply
   C. Obtain an dc output waveform from a dc power supply
   D. Obtain an ac output waveform from a ac power suppl

5. The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?

   A. High dv / dt, low di / dt
   B. Low dv / dt, low di / dt
   C. Low dv / dt, high di / dt
   D. High dv / dt, high di / dt

6. 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

7. 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

8. The output power of the cascaded amplifier / attenuator system can be determined using___________?

   A. Actual gain of amplifier
   B. Actual gain of amplifier and attenuator
   C. Gain in dB of amplifier and attenuator
   D. Actual gain of attenuator

9. For power output higher than 15 kW, the suitable rectifier is________________?

   A. Single phase
   B. 3 phase
   C. Poly phase
   D. Only (b) and (c)

10. Any electrical signal present in a circuit other than the desired signal is known as______________?

    A. Noise
    B. Distortion
    C. Interference
    D. All of these