AC Generator

Q.

Define the term.

Short-circuiting

Q.

Which position of the coil in the magnetic field gives maximum emf?

1. 

2. 

3. 

4. 

Q.

1. The emf.is maximum when the plane of the coil is parallel to the magnetic field and the emf is minimum when the plane of the coil normal to the magnetic field

2. The emf.is maximum when the plane of the coil is normal to the magnetic field and the emf is minimum when the plane of the coil parallel to the magnetic field

3. The emf.is maximum when the plane of the coil is parallel to the magnetic field and the emf is minimum when the plane of the coil 180⁰ to the magnetic field

4. The emf.is maximum when the plane of the coil is normal to the magnetic field and the emf is minimum when the plane of the coil perpendicular to the magnetic field

Q.

Can there be any way to convert sound energy to electricity

Q.

A generator or dynamo works on the principle__________

Q.

An electric generator is a device which works on the principle of electromagnetic induction.

1. True

2. False

Q.

What is the energy transformation in a moving coil microphone?

1. Heat energy to Sound energy

2. Sound energy to Electrical energy

3. Sound energy to Light energy

4. Electrical energy to Sound energy

Q. What is the principle of motor and generator?

Q.

Electric motor is a device which converts

1. Electric energy into magnetic energy

2. Magnetic energy into electrical energy

3. Mechanical energy into electrical energy

4. Electrical energy into mechanical energy

Q.

In a radio _______energy transforms into _____ energy.

Q. Find the length of the conductor which is moving at a speed of 10 m/s in the direction perpendicular to the direction of magnetic field of induction 0.6 T, if it induces an emf of 18 V between the ends of the conductor.

1. 1m
2. 2m
3. 3m
4. 4m

Q.

Define turbine and dynamo

Q.

Alternator is another name for an AC generator.

1. True

2. False

Q.

An armature consists of an arrangement of insulated copper wires wound around a soft iron core.

1. True

2. False
   

Q.

The graph given below represents the variations of current produced by an AC generator with the time.

1. True

2. False

Q.

Explain the working of the motor in a mixer.

Q.

The armature in an AC generator is turned alternatively due to the current and magnetic field opposing each other but the generator is used to produce electricity by induction so how does it changes direction if no electricity is available in the conductor is the armature turned in an alternative manner manually

Q. An alpha particle is moving along x axis in xy plane with v= 10 to the power 3 m|sec.A magnetic field of 10 Tesla is presented along z axis .Find out the direction and magnitude of force on the particle.

Q.

State energy conversion that takes place during working of Microphone is

1. Sound energy to Electrical energy

2. Magnetic energy to Sound energy

3. Light energy to Sound energy

4. Sound energy to Light energy

Q.

The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown.

Does the direction of the current in the coil appear clockwise or anticlockwise when viewed from the end A?

1. Initially Clockwise and then Anti-clockwise

2. Clockwise

3. Anti-clockwise

4. Initially Anti-Clockwise and then clockwise

Q. Difference between slip ring and split ring in terms of its function

Q.

_____ is an arrangement that is always in contact with the slip rings, which allows current to flows to the external circuit.

1. Armature

2. Commutator

3. Brush

4. Field magnet

Q.

Name any two electrical appliances in which a DC motor is used?

Q. Two particle each of mass m and charge q are attached to the two ends of a light rigid rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitude of the magnetic moment of the system and its angular momentum about the centre of the rod

Q.

What is the principle of Rheostat?

Q. Which device is used to convert electrical energy into mechanical energy ?

1. Electric generator
2. Solenoid
3. Electric motor
4. Electric iron

Q. Slip rings are full rings fused to the ends of the _____, which rotate about the same axis as that of the armature.

1. armature coil
2. brushes
3. field magnet
4. load

Q.

The current produced by an AC generator with slip rings is shown in graphs (1) and (2). Then which of the following correctly represent the variations in current with time?

1. (1) only

2. (2) only

3. Both (1) and (2)

4. Neither (1) and (2)

Q.

What are hazards associated with electricity?

Q. The current produced by a generator with slip rings will have which of the following current variations with time as output ?

1. 1 only
2. 2 only
3. Both 1 and 2
4. Neither 1 nor 2