For 25 kV single phase system power supply frequency is_______________?

Related Mcqs:

1. ________________ frequency is not common in low frequency traction system?

   A. 40 Hz
   B. 25 Hz
   C. 16 Hz
   D. non of these

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

   A. 22 V
   B. 440 V
   C. 5 kV
   D. 15 kV
   E. None of the above

3. 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

4. The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?

   A. 1Hzs
   B. 1.5Hzs
   C. 106sec
   D. 1sec

5. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?

   A. 20%
   B. 80%
   C. 40%
   D. 50%

6. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?

   A. 10 W
   B. 15 W
   C. 5 W
   D. 20 W

7. The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?

   A. Transistor
   B. Biasing circuit
   C. Collector supply VCC
   D. None of the above

8. Overhead lines for power supply to tramcars are at a minimum height of______________?

   A. 3 m
   B. 6 m
   C. 10 m
   D. 15 m

9.  If P is the power of a star connected system then what will be power of an equivalent delta connected system?

   A. P
   B. 3P
   C. P/3
   D. None of the above

   Updated by: muhammad rahim

10. The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?

    A. 20 W
    B. 40 W
    C. 10 W
    D. 80 W