Electric generator - class-IX
Description: electric generator | |
Number of Questions: 75 | |
Created by: Prabha Kade | |
Tags: magnetic effects of electric current electromagnetic induction effects of electric current physics magnetism and electromagnetism electromagnetic induction and alternating currents |
The working of a generator is based upon the
Suggest way/s in an a.c. generator to produce a higher e.m.f.
The laws of electromagnetic induction have been used in the construction of a :
A D.C. generator is based on the principle of.
In an electric generator ,split rings are used for
If the speed of rotation of armature coil is increased in an AC generator
A feature common to both AC and DC generator is ______.
In an AC generator, the rate of change of magnetic flux through the coil is maximum when the angle between the plane of the coil and the lines of force is
A dynamo converts:
In an AC generator, the ends of the coil are connected to ____________.
Electric generator ____________.
An electric generator actually acts as :
Electric generator (Dynamo) generates electricity by using the principle ______.
Dynamos is a device that _______.
Principle behind electric generator is
Generators used in power stations to generate electricity are
There is no ________ in AC generator.
In large powerhouse generator, the ________ are stationary and the _______ rotates
________ are used in making electric generators and electric motors.
AC generator means
A small generator is called a _______.
The major differences between an electric motor and generator are stated below
Dynamo produces
Principle behind the working of electric generator?
Mark the incorrect statement related to construction and working of a generator
When the plane of the rectangular coil is parallel to the direction of the magnetic field in a dynamo, then
Carbon brushes are not necessary in a dynamo, if the coil remains stationary and the magnet moves, because
A small AC dynamo is connected to a galvanometer and gently rotated, then the needle of the galvanometer,
A domestic electrical appliance requires alternating current of 15 V. If 220 V of alternating current is supplied to the house, then the device that helps in the functioning of that electrical appliance is
Dynamo produces:
A dynamo converts
When speed of a DC generator decreases, the armature current
Dynamo is designed on the principle of
The main difference between A.C. generator and D.C. generator is
A six pole generator with fixed field excitation develops an emf of $100 { V } ,$ when operating at 1500$ { rm }$ At what speed must it rotate to develop $120 { V } ?$
Starter is used in
To convert mechanical energy into electrical energy, one can use
Which instrument works on the principle of "Electromagnetic induction?
A coil of inductance 0.1 H is connected to an alternating voltage generator of voltage E = 100 sin (100 t) volt. The current flowing through the coil will be
In an a.c. generator the speed at which the coil rotates is doubled. How would this affect the frequency of output voltage ?
In an AC generator, maximum number of lines of force pass though the coil when the angle between the plane of coil and lines of force is :
What energy conversion takes place in a generator ?
The essential difference between a d.c. dynamo and an a.c. dynamo is that
An electrical generator works on the principle of electromagnetic induction.
Complete the sentence by using the correct words given in the brackets:
A dynamo
A dynamo is used to supply electric current to a small electric bulb, If the number of turns in the coil of this dynamo is doubled, then the voltage in the bulb.
In a DC generator, the ends of the coil are connected to __________.
An electricity generating machine consists of a turbine and a______
If the coil in a simple generator is wound around a soft iron core then:
If we use a powerful electromagnet in place of permanent magnet in a generator, then:
A commutator changes the direction of current in the coil of
What is a commutator?
AC generator is also h/a
Electric generator is classified on the bases of
Which of the following can't increase the voltage produced by the generator?
Dynamo is a type of
A dynamo consists of
A dynamo does not consist of
Dynamo is
Which of the following is a component of dynamo?
Output emf in a dynamo is generated on
Dynamo converts :
Fleming's left and right hand rule are used in
Generators uses the principle of ________ to push electrons through a wire.
A dynamo makes 100 cycles per second. The frequency of the AC is
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
A device for producing electric current is ________.
Which of the following statement is correct?
The device which converts the mechanical energy in to electric energy is
Read the following statements and answer whether the given statement is true or false.
For a dynamo which one of the following statements is correct
To convert mechanical energy into electrical energy, one can use
The current produced in a generator armature is AC because