A 25eV electron has a speed of______________?

Related Mcqs:

1. An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?

   A. 150msec-1
   B. 384msec-1
   C. 38.4msec-1
   D. 200msec-1

2. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is______________?

   A. 0.56 x 1015 m/s2
   B. 1.5 x 1015 m/s2
   C. 1.6 x 1015 m/s2
   D. 1.76 x 1015 m/s2

3. A hole and electron in close proximity would tend to________________?

   A. Repel each other
   B. Attract each other
   C. Have no effect on each other
   D. None of the above

4. The rate of acceleration on suburban orurban services is restricted by the consideration of______________?

   A. Engine power
   B. Track curves
   C. Passenger Discomfort
   D. Track size

5. 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

6. The speed of a locomotive is controlled by_______________?

   A. flywheel
   B. gear box
   C. applying brakes 11.
   D. regulating steam flow to engine

7. Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?

   A. it has longer free running period
   B. it has longer coasting period
   C. accelerating and braking periods are comparatively smaller
   D. all of the above

8. 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

9. __________________ has relatively wider range of speed control?

   A. Synchronous motor
   B. Ship ring induction motor
   C. Squirrel cage induction motor
   D. D.C. shunt motor

10. Which of the following motors is preferred when quick speed reversal is the main consideration ?

    A. Squirrel cage induction motor
    B. Wound rotor induction motor
    E. Synchronous motor
    D. D.C. motor