Which of the following is the voltage for single phase A.C. system ?

Related Mcqs:

1. A series resonant band-stop filter consists of a 68 Ω resistor, a 110 mH coil, and a 0.02 µF capacitor. The internal resistance, RW, of the coil is 4 Ω. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?

   A. 1.1 mV
   B. 11.1 mV
   C. 111 mV
   D. 200 mV

2. A series resonant band-pass filter consists of a 2 mH coil, a 0.005 µF capacitor, and a 120 Ω resistor. The winding resistance of the coil is 12 Ω. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?

   A. 10.9 V
   B. 1.09 V
   C. 1.1 V
   D. 12 V

3. In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?

   A. 180o
   B. 270o
   C. 90o
   D. 0o

4. Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?

   A. Reduced current method
   B. Tap changing control of transformer
   C. Series parallel operation of motors
   D. All of the above

5. A certain voltage divider consists of two 12 kΩ resistors in series. Which of the following load resistors will have the most effect on the output voltage?

   A. 1 MΩ
   B. 24 kΩ
   C. 18 kΩ
   D. 12 kΩ

6. A certain voltage divider consists of three 1 kΩ resistors in series. Which of the following load resistors will have the least effect on the output voltage?

   A. 1 MΩ
   B. 100 kΩ
   C. 1 kΩ
   D. 330 Ω

7. For 25 kV single phase system power supply frequency is_______________?

   A. 60 Hz
   B. 50 Hz
   C. 25 Hz
   D. 16 Hz

8. Two 3.3 kΩ resistors are in series and this series combination is in parallel with a 4.7 kΩ resistor. The voltage across one of the 3.3 kΩ resistors is 12 V. The voltage across the 4.7 kΩ resistor is_________?

   A. 24 V
   B. 12 V
   C. 0 V
   D. 6 V

9. A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is____________?

   A. 18 V peak-to-peak
   B. zero
   C. 9 V peak-to-peak
   D. 12.74 V peak-to-peak

10. In a certain low-pass filter, fc = 3.5 kHz.if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

    A. 0 V
    B. 5.97 V
    C. 6 V
    D. 597 mV