WorksheetsAC GENERATOR
Total questions: 10
Worksheet time: 5mins
The working principle og AC generator is
The voltage induced in a conductor is ___________ ___________ to the rate which the conductor cuts the magnetic lines of force.
inversely proportional
directly proportional
negatively coorelated
absolutely opposite
How is contact between the coil and circuit maintained in an AC generator?
A split ring commutator connects to each side for half a turn
It cannot be maintained.
The alternator can only complete one revolution and must then be rotated in reverse
Slip rings and brushes allow continuous connection
A coil is rotated steadily between the poles of a magnet. The coil is connected to an oscilloscope.
Which graph shows the output voltage V against time t?
Which diagram represents the voltage output of a simple a.c. generator?
If the coil is placed perpendicular to field lines then the number of lines passing through the coil is:
Minimum
Maximum
Zero
May be maximum or minimum
AC generator converts:
Mechanical energy to electrical energy
Electrical energy to mechanical energy
Heat energy to mechanical energy
Chemical energy to electrical energy
The direction of induced emf or current is indicated by:
Fleming’s left-hand rule
Fleming’s right-hand rule
Faraday’s law of electromagnetic induction
Ampere’s swimming rule
In an a.c. generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B the maximum value of emf generated in the coil is:
NABR
NABω
NABRω
NAB
When a coil is held stationary in magnetic field, the induced current in it:
continuously changes
randomly changes
remains zero
becomes maximum
