WorksheetsJ194 Theory 2 Quiz
Total questions: 58
Worksheet time: 1hrs 2mins
In an alternating current circuit, when current lags voltage, it would indicate
what type of circuit?
Capacitive
Resistive
Inductive
Magnetic
If a conductor is cut by magnetic lines of force
The magnetic field increases
An emf is induced in the conductor
A magnetic is created around the conductor
Nothing will happen
The alternating voltage & current that has the same heating effect as the
same value for direct voltage and current is known as
Average value
Instantaneous value
Peak value
RMS value
The phase angle between voltage and current in a resistive A.C. circuit is
0°
45°
90°
120°
The angle of electrical displacement in a 3 phase electrical system is
120 degrees
180 degrees
90 degrees
360 degrees
A phasor diagram
rotates clockwise
rotates counter clockwise
rotates clockwise and counter clockwise
does not rotate
In an AC circuit, when voltage and current are said to be ‘in phase’ the circuit
would be:
Purely capacitive
Purely inductive
Purely resistive
Purely reactive
Which device has the same effect on A.C. and D.C. circuits:
resistors
capacitors
inductors
transformers
When testing the insulation resistance between motor windings and earth the
insulation resistance tester should be set on:
100 volts
2000 volts
1000 volts
1000 volts
Which does not have an inductive effect on A.C. circuits:
transformer
motor
electrical cable
sump heater
If a star connected alternator had a line voltage of 400 volts, the phase
voltage would be:
240 volts
230 volts
415 volts
110 volts
Conductors with current flowing in opposite direction have magnetic fields
that:
Attract
Stay neutral
Repel
Displace
Adding capacitance to an A.C. resistive circuit will cause circuit current to:
lead voltage
lag voltage
remain unchanged
increase
The rotor in an induction motor is unable to reach synchronous speed due to:
Torque
Slip
Reactance
Friction
The continuity of an effective earthing system should be:
About 1 Megohm
Less than 100 k ohms
2 ohms
Less than 1 ohm
The effect of inducing an emf by placing a conductor or a coil with an AC
voltage across it within close proximity to another conductor or coil is known
as:
Electromagnetic induction
Inductance
Self induction
Mutual induction
Opposition to current flow in a D.C. circuit is known as resistance, the
equivalent in an A.C. circuit is:
reactance
impedance
transients
secondary resistance
Relays and contactors use which effect of current to operate:
heating
chemical
magneto
magnetism
In an electrical installation, the MEN link stands for:
multiple earth neutral
mechanical electrical neutral
main electrical negative
main earth neutral
You want people to know you like MEN
Transformers operate on the principle of:
auto-bots
mutual impedance
mutual inductance
forced inductance
Bruce Jenner
When a conductor is rotated in a magnetic field a/an (a)
is produced.
A.C. voltage and current for a resistor in the same circuit are always
(a) with each other.
A reed switch uses a (a) to operate the switch
contacts.
An inductive type load causes the current in an A.C. circuit to (a)
the voltage.
If a three phase system has a phase sequence of ABC, the reverse phase
sequence is (a) .
Star and (a) are the two connection methods for three phase
systems.
The circuit protective device can be either a fuse or (a) .
The purpose of AS/NZS 3000:2007 is to prevent electric shock and (a) .
The (a) conductor provides a path for fault current.
Name three things that affect the value of induced emf in a conductor when it cuts
a magnetic field?
(a)
The 3 pictures below represent the relationship between voltage and current in an
alternating current circuit. Name the 3 circuit types?
(a)
The 3 pictures below represent the relationship between voltage and current in an alternating current circuit. Name the 3 circuit types?
(a)
The 3 pictures below represent the relationship between voltage and current in an alternating current circuit. Name the 3 circuit types?
(a)
The picture below shows Fleming’s left hand motor rule. Complete the diagram below:
(a)
The questions relate to the picture below
A) What is the instrument pictured above?
B) What test would this meter be performing?
C) Would this reading be acceptable under AS/NZS 3000:2007?
(a)
Draw a phasor diagram to represent the sine waves below
(a)
The questions relate to the picture below
A) What is the instrument pictured above?
B) What test would this meter be performing?
C) Would this reading be acceptable under AS/NZS 3000:2007?
(a)
Draw a phasor diagram to represent the sine waves below
(a)
What would the meter read in the diagram below?
(a)
Apply Flemings rule to the diagram below to determine the rotation of each machine
(a)
Draw a three phase sine wave, identify each phase on your diagram:
Draw a phasor diagram to represent the three phases in Question 10
Label the components on this drawing?
(a)
Calculate the value of resistance in this circuit?
(a)
Draw a phasor diagram to represent this circuit?
(a)
Mark lines demonstrating how the two metals affect the magnetic field from the magnet
(a)
Indicate the current direction
(a)
Mark the north & south poles
(a)
Draw the magnetic flux pattern
(a)
Indicate the direction of the magnetic flux
(a)
Draw the Australian Standard symbols for a 12 volt battery
Draw the Australian Standard symbols for a PTC Thermistor
Draw the Australian Standard symbols for an Iron Core Transformer
Draw the Australian Standard symbols for a Fuse
Draw the Australian Standard symbols for a Lamp
State the meaning of this symbol?
(a)
In AS/NZS 3000:2007; what colour is reserved for insulation on Earthing conductors?
(a)
What are the three factors which determine the severity of an electric shock?
(a)
