Electric Motor
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What is an electric motor ? State its principle.
A device which converts electrical energy into mechanical energy is called _______.
State two ways by which the speed of rotation of an electric motor can be increased.
The direction of rotation of a DC motor, as shown below, is in the clockwise direction.
The direction of magnetic field is ___.
Left to right
Right to left
Vertically upwards
Vertically downwards
Name some devices in which electric motors are used?
Why do power stations generate AC, not DC?
Name the materials used in making permanent magnets.
What is the function of a commutator in an electric motor ?
The speed of a DC motor can be increased by
increasing area and number of turns in the coil.
increasing the magnetic field.
increasing current
decreasing current
- True
- False
An electric motor converts mechanical energy into electrical energy.
- True
- False
- Armature
- Carbon brushes
- Slip rings
- Split rings
Name two appliances in which an electric motor is used.
In what ways can a motor be made more powerful?
By using a soft iron core.
By increasing the number of turns in the coil.
By increasing the strength of the current in the motor
By reversing the direction of current in the motor
The typical output characteristics curve for a transistor working in the common emitter configuration is shown in the figure
The estimated current gain from the figure is _____.
In an electric motor, the energy transformation is from
- electrical to chemical
- chemical to light
- mechanical to electrical
- electrical to mechanical
If a current is passed through a spring then spring will
Remains same
Expand
Compress
None of the options
Name one device which works on the principle of magnetic effect of current.
What is the principle of an electric motor ? Name some of the devices in which electric motors are used.
Can you please differentiate between split rings and slip rings..
Name the device which is used to reverse the direction of current in the coil of a motor .
Which is the following is not an Actuator? Servo motor Stepper motor DHT Relay- GK Q&A
The current gain in the common emitter amplifier is . If the emitter current is , find, (i) base current (ii) collector current.
The wire in Figure below is being moved downwards throught are magnetic fields so as to produce induced current.
What would be the effect of :
(a) moving the wire at a higher speed ?
(b) moving the wire upwards rather than downwards ?
(c) using a stronger magnet ?
(d) holding the wire still in the magnetic field ?
(e) moving the wire parallel to the magnetic field lines ?
The magnitude of induced EMF is maximum, when the plane of the armature of AC dynamo is ________.
Describe the flow of direct current (DC) in an electrical circuit
