Utilazition of electric power mcq 2 , all questions are selected for examination purpose so you consentrat this type of questions which are comes in your exam
a. It improves commutation
b. Increases efficiency
c. Improves power factor
d. All of these
2. The lighting system of almost all the earlier coaches and all the newly manufactured coaches has
Ans- 110v
3. The magnitude for the tractive effort which is required for the propulsion of the train depends on.
a. The adhesive weight
b. Friction between the driving wheel and the track
c. Both (a) and (b)
d. Neither (a) nor (b)
4. If W is the dead weight of the train in tones and A is the acceleration of the train in kmphps then the tractive effort required for linear acceleration is given by.
a. WA newtons
b. 177.7 WA newtons
c. 277.8 WA newtons
d. 388.8 WA newtons
5. In a diesel electric traction, if the current in the traction motor increases then the generator field
a. Demagnetizes and voltage decreases
b. Magnetizes and voltage increases
c. Magnetizes and voltage decreases
d. Demagnetizes and voltage increases
6. A trolley bus runs on tyres driven by
a. A DC compound motor
b. A DC series motor
c. An AC series motor
d. An AC shunt motor
7. In fluorescent lamp one capacitor is connected across the lamp circuit and another is connected across the starter. Then
a. Both the capacitors are used for improving power factor
b. Both the capacitors are used for reducing radio interference
c. Former capacitors is used for improving power factor and later is used for reducing radio interference
d. Former capacitors is used for reducing radio interference and later is used for improving power factor
8. The main electrode of high pressure mercury vapour lamp is made up of
a. Quartz
b. Hard glass
c. Tungsten
d. Bronze
9. Which type of heating is used for sterilization?
a. High frequency eddy current heating
b. Coreless type heating
c. Core type heating
d. Dielectric heating
10. Eureka is an alloy of
a. Nickel and chromium
b. Nickel and copper
c. Iron, chromium and aluminium
d. Nickel, chromium and aluminium
11. A good heating element should have
a. High resistivity and low melting point
b. Low resistivity and high melting point
c. High resistivity and high melting point
d. Low resistivity and low melting point
12. Non - consumable electrodes are made of
a. Carbon
b. Graphite
c. Either carbon or graphite
d. Same material as the metal pieces to be welded
13. Voltage required for butt welding is
a. 2 to 8 V
b. 8 to 15 V
c. 15 to 22 V
d. 22 to 30 V
14. For welding aluminium alloys, the electrodes used are
a. Hard drawn copper
b. Cadmium copper
c. Chromium copper
d. Tungsten copper
15. The heat required by the weld is produced due to the contact resistance between the two pieces and is
a. Directly proportional to the current
b. Directly proportional to the square of the current
c. Inversely proportional to the square of the current
d. Inversely proportional to the current
16. In case of dc series motor, the torque can be found from
a. Only magnetization curve
b. Only demagnetization curve
c. Both (a) and (b)
d. None of these
17. Which among the following is mechanical braking?
a. Pneumatic braking
b. Plugging
c. Dynamic braking
d. Regenerative braking
18. The ratio of the distance between any two stops and the sum of the time of run and the time of stop at one station is known as
a. Crest speed
b. Average speed
c. Maximum speed
d. Scheduled speed
19. In mail line train services, the
a. Acceleration and braking periods are long
b. Acceleration and braking periods are short
c. Free run and coasting periods are long
d. Both (b) and (c)
20. For running at half of the maximum speed, the batteries of battery electric drive are connected in
a. Parallel
b. Series
c. Series - parallel
d. Drive cannot run at this speed
