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WorksheetsCPL Acft Tech - Electricity and Magnetism
Total questions: 20
Worksheet time: 12mins
Ohm's law states that in a circuit if the current is 30 Amperes and resistance is 15 Ohms, then the Voltage will be...
450 volts
2 volts
0.5 volts
2 millivolts
An electric current is traveling in a wire. A compass is placed under the wire with the current flowing from north to south. In response, the compass needle will-
rotate because of a magnetic force that acts on the needle
rotate because of an electric force that acts on the needle
not move because moving electric charges do not exert magnetic forces on the needle
not move because moving electric charges do not exert electric forces on the needle
Which of the following is an example of a resistor?
battery
light bulb
wire
switch
Electric current that reverses its direction of flow in a regular pattern is...
Voltage
Direct Current
Alternating Current
Parallel Circuit
Temporary magnets...
are also known as electromagnets
are materials that are easily magnetised
can be found inside batteries
are used in aircraft magnetic compasses
Placing the two north poles of magnets together would result in which electromagnetic force?
repulsion
attraction
polarity
intransigence
Lines of force emanating from a magnet are known as
magnetic fields
magnetic poles
magnetic particles
magic!
Changing current from AC to DC is known as...
recitification
inverting
resiisting
volting
The unit of frequency is the hertz (Hz).
It is defined as...
one unit per minute
one unit per second
one unit per hour
one unit per day
Current flowing through a straight wire (or any conductor which is straight) makes a magnetic force, which...
is perpendicular to the wire
is in line with the wire
runs through the wire in the same direction as the current
runs through the wire in the opposite direction to the current
A current is passed through a coil of wire. Which statement is correct?
No magnetic field is formed
The lines of the magnetic field will be in line with the axis of the coil
The lines of the magnetic field will be in line with the wire at all times
The magnetic field formed will block the current from flowing through the coil
A common use of a solenoid in light aircraft is to power the...
artificial horizon
navigation lights
landing light
starter motor
A practical alternator consists of...
an electromagnet rotating inside a coil of wire
a coil of wire rotating between the poles of a stationary magnet
magic!
electrolytes and electrodes
A generator converts...
AC to DC by the use of a commutator
DC to AC by the use of a commutator
AC to DC via the use of silicon diodes
DC to AC by the use of silicon diodes
To prevent current from flowing back to the battery, a _____________ requires a __________________ .
Generator , reverse current relay
Alternator , reverse current relay
Generator , solenoid
Alternator , solenoid
Which statement is correct?
Only alternators require a current regulator
Only generators require a current regulator
Both alternators and generators require a current regulator
Neither alternators nor generators require a current regulator
Your aircraft battery has a capacity of 20 Ampere hours. Your aircraft is presently drawing 2 Amps for the GPS, 1 Amp for the radio and 7 Amps for the MFD. If you alternator fails, what is the maximum time the battery power all of the above for?
20 hours
20 minutes
2 hours
2 minutes
