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. 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

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. 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

5. 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

6. 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)

7. For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would

   A. Decrease with frequency
   B. Remains same with change in frequency
   C. Increase with frequency
   D. Either A. or B.

8. 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

9. Power electronics essentially deals with control of a.c. power at____________?

   A. Frequencies above 20 kHz
   B. Frequencies above 1000 kHz
   C. Frequencies less than 10 Hz
   D. 50 Hz frequency

10. In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies

    A. 5
    B. 7
    C. 11
    D. All of these