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WorksheetsSimple Electric Motor and Generator
Total questions: 15
Worksheet time: 15mins
What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?
Electromagnet
Electron magnet
Generator
Motor
To increase the magnifying power of a telescope, the focal length of ______.
Objective lens should be increased.
Objective lens should be decreased.
Eye-piece lens should be increased.
Eye-piece lens should be decreased.
In an electric motor, the energy transformation begins as ---------.
electrical and becomes chemical
electrical and becomes mechanical
mechanical and becomes electrical
mechanical and becomes chemical
Which of the following optical instruments will be used to produce a reduced and inverted image of distant objects?
camera
microscope
projector
refracting telescope
In projectors which lenses are used?
Convex lens
Concave lens
Bipolar lens
Both A and B
Electric motors are significant in industries which is also used in a variety of applications. Which of the following devices does NOT apply the working principle of an electric motor?
Drills
Water pumps
light bulb
Washing machine
Electromagnetic induction was discovered by
Thomas Edison
Nikola Tesla
Benjamin Franklin
Michael Faraday
To correct nearsightedness, a person is prescribed with what kind of lenses?
Converging lens
Diverging lens
Focusing lens
None of the above.
Which is the correct sequence in the operation of simple motor?
I. Magnets placed near one another either attract or repel.
II. The attraction and repulsion causes the wire to jump.
III. Electric current starts to creep along wire; it creates a magnetic field all around it.
IV. Electrical energy converted to mechanical energy.
V. Temporary magnetic field interacts with the permanent magnet
V, IV, II, II, I
III, V, I, II, IV
V, III, I, IV, III
III, II, IV, I, V
What are the three basic parts of an electric motor?
commutator, stator, and rotor
armature, brushes, and battery
commutator, armature, and brushes
battery, armature, and DC power supply
What is most likely to happen when the switch is closed?
magnetic field should be produced
The battery will explode
The nail will rust
The wire will catch on fire
What part of the camera corresponds to the retina of our eyes?
aperture
shutter
iris diaphragm
photographic film
While you are busy during your online class, you saw a basket full of laundry and you thought of bringing them in a laundering establishment. What transformation of energy takes place in the washing machine’s motor?
Electrical to Chemical Energy
Electrical to Mechanical Energy
Mechanical to Electrical Energy
Mechanical to Chemical Energy
The rate of hear production in the stator windings of an AC induction motor is _______ proportional to the _________of the stator current.
directly, amount
inversely, amount
directly, square
inversely, square
The electric motor is the electric machine within the ceiling fan that converts electrical energy into mechanical energy.
I. The ceiling fan capacitor torques up the electric motor, allowing it to start and run.
II. An electrical current reaches the motor and then enters coils of wire that are wrapped around a metal base.
III. A magnetic field is caused that expends force in a clockwise motion that actually changes the electric energy into mechanical energy.
IV. This action causes the motor coils to spin. As the coils are spinning, the fan captures this spinning motion, transferring it to the fan blades.
I, II, III, IV
IV, III, II, I
I, IV, III, II
IV, I, II, III
