Which of the following has no units?

Related Mcqs:

1. Which of the following are the passive elements?

   A. Resistor
   B. Bulb
   C. Both
   D. None of these.

2. Which of the following quantities consists of SI unit as WATT ?

   A. Force
   B. Charge
   C. Current
   D. Power

3. For which of the following ‘ampere second’ could be the unit ?

   A. Reluctance
   B. Charge
   C. Power
   D. Energy

4. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?

   A. The current through each bulb in same
   B. The voltage across each bulb is not same
   C. The power dissipation in each bulb is not same
   D. None of the above

5. Which of the following is an advantage of electric traction over other methods of traction ?

   A. Faster acceleration
   B. No pollution problems
   C. Better braking action
   D. All of the above

6. For a particular application the type of electric-and control gear are determined by which of the following considerations ?

   A. Starting torque
   B. Conditions of environment
   C. Limitation on starting current
   D. Speed control range and its nature
   E. All of the above

7. Which of the following motors are best for the rolling mills ?

   A. Single phase motors
   B. Squirrel cage induction motors
   C. Slip ring induction motors
   D. D.C. motors

8. In which of the following applications the load on motor changes in cyclic order ?

   A. Electric shovels
   B. Cranes
   C. Rolling mills
   D. All of the above

9. For a motor-generator set which of the following motors will be preferred ?

   A. Synchronous motor
   B. Slip ring induction motor
   C. Pole changing induction motor
   D. Squirrel cage induction motor

10. In series motor which of the following methods can be used for changing the flux per pole ?

    A. Tapped field control
    B. Diverter field control
    C. Series-parallel control
    D. Any of the above