A.C cannot be used for________________?

Related Mcqs:

1. Long distance transmission is easy for________________?

   A. D.C voltage
   B. A.C voltage
   C. Half A.C voltage
   D. Half D.C voltage

2. A.C cannot be used for_______________?

   A. producing heat
   B. producing light
   C. magnetizing and electroplating
   D. all the above

3. In squirrel cage induction motors which of the following methods of starting cannot be used ?

   A. Resistance in rotor circuit
   B. Resistance in stator circuit
   C. Auto-transformer starting
   D. Star-delta starting

4. The minimum charge on any object cannot be less than_______________?

   A. 1.6 x 10-19C
   B. 3.2 x 10-19C
   C. 9.1 x 109C
   D. no definite value exist

5. A dynamo converts______________?

   A. mechanical energy into electrical energy
   B. electrical energy into mechanical energy
   C. magnetic energy into mechanical energy
   D. magnetic energy into electrical energy

6. Which of the following works on torque on the current carrying conductor placed in magnetic field ?

   A. galvanometer
   B. ammeter
   C. voltmeter
   D. all of the above

7. A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?

   A. A torque about horizontal axis
   B. A torque about vertical axis
   C. An upward force along the axis
   D. No resultant force

8. Transformer works on the principle of________________?

   A. Lenzs law
   B. Faradays law
   C. Mutual induction
   D. Law of conservation of power

9. Non inductive resistances are used in decreasing______________?

   A. Mutual inductance
   B. Self inductance
   C. Magnetic fields
   D. Heating effect

10. Energy stored in a magnetic field is given by______________?

    A. LI2
    B. L2I/2
    C. LI2/2
    D. IL2