Worksheets5357-003/2365-202
Total questions: 40
Worksheet time: 1hrs 20mins
What can 200 MΩ also be expressed as?
a. 200 x 10-9 Ω
a. 200 x 10-6 Ω
a. 200 x 106 Ω
a. 200 x 109 Ω
In the triangle shown, what is the length of side 'x’?
2 cm
6 cm
9 cm
12 cm
What is the volume of a room that measures 3 m in width, 8 m in length, and the ceiling is 2.4 m high?
13.4 m2
13.4 m3
57.6 m2
57.6 m3
What is the SI unit of measurement foe temperature?
°C
°F
°K
°T
Hertz is the SI unit for what quantity?
Resistivity
Frequency
Reactance
Capacitance
What is the formula used to determine impedance?
RZ
R2−X2
R2+X2
ZR
How must a voltmeter be connected to measure the potential difference across a load in a dc circuit?
In parallel with the load.
In series with the load.
Using an inverter.
Using a rectifier.
Which one of the following formulae is used to determine weight?
massgravity
gravity ×force
forcegravity
Which device is a claw hammer being used as when extracting a nail from a piece of wood?
A pulley.
A lever.
A winch.
A jack.
Approximately what force is needed to raise the 500 kg mass shown in the diagram?
125 N
250 N
500 N
1250 N
What is stored energy known as?
Potential energy.
Kinetic energy.
Shear energy.
Idle energy.
What is the input of an electric motor with an output of 2.1 kW, that has an efficiency of 85%
0.525 kW
2.47 kW
2.95 kW
3.27 kW
What would be the approximate power required to raise a 500 kg mass to a height of 50 m in 90 seconds?
0.277 kW
2.72 kW
37.5 kW
55.5 kW
What is the input of an electric motor with an output of 5 kW, that has an efficiency of 80%?
4 kW
4.25 kW
6 kW
6.25 kW
Which atomic part flows when current flows?
Protons.
Centrons.
Neutrons.
Electrons.
Which one of the following is the best conductor?
Gold.
Lead.
Brass.
Copper.
A conductor measuring 50 m in length has a resistance of 0.4 Ohms. What would be its resistance if its length is reduced to 25 m?
0.2 Ω
0.4 Ω
0.6 Ω
0.8 Ω
What is the length of a 4 mm2 copper conductor having a measured resistance of 0.0089 Ω, if the resistivity of copper is 17.8 μΩ/m?
20 m
30 m
40 m
50 m
What is the relationship between voltage and current across the resistors for the circuit shown?
Same voltage, same current across each resistor.
Different voltage, same current across each resistor.
Same voltage, different current across each resistor.
Different voltage, different current across each resistor.
Which of the following statements is correct for all series circuits?
The voltage varies across the resistors but the current is constant.
The current varies across the resistors but the voltage varies.
The resistance and current varies when the voltage is constant.
The voltage and current remains constant when the resistance changes.
For the circuit shown, what would be the voltage reading of voltmeter (V1)?
20 V
30 V
50 V
60 V
For the circuit shown, what would be the voltage reading of voltmeter (V1)?
30 V
50 V
150 V
200 V
What would be the total supply current (Is) for the circuit shown?
0.33 A
1.33 A
3.33 A
10.0 A
How would current passing through the 20 Ω resistor be determined for the circuit shown?
Dividing the supply voltage by 20 Ω
Multiplying the supply voltage by 20 Ω
It would be half the total supply current
It would be equal to the total supply current
What would be the total circuit resistance if a parallel circuit contained five resistors, all having a resistance of 50 Ω?
0.1 Ω
5 Ω
10 Ω
50 Ω
What would a circuit containing several resistors be classified as if the total resistance is found by adding all of the resistances together?
Series.
Transverse>
Parallel.
Reciprocal.
What is the power dissipated in the circuit shown?
100 W
300 W
1 kW
3 kW
Voltage drop in a circuit is affected by the resistance of what part of the cable?
The line conductor only.
The line and neutral conductors.
The line and earthing conductors.
The line, neutral, and earthing conductors.
What would be the effect of placing a copper clad earth electrode into soil, close to a lead water pipe?
Electrolysis.
Soil heating.
Short circuits.
Calcium build up.
What would be the effect of placing the south pole of two magnets together?
The two magnets would be drawn together.
The two magnets would be pushed away from each other.
The strength of the magnets would be doubled.
The strength of the magnets would be halved.
Which unit is used to measure the strength of the magnetic field produced by a permanent magnet?
Weber.
Henry.
Tesla.
Farad.
What would be the force exerted on a conductor 20 cm long, carrying a current of 2 A, when placed at right angles to a magnetic flux density of 8 Tesla?
3.2 N
16 N
32 N
48 N
What would be the effect on the magnetic field when reducing the amount of current flowing through a coil?
The strength of the field will increase.
The strength of the field will decrease.
The strength of the field will vary.
The strength of the field will remain constant.
Which simple device consists of a coil of wire which is rotated within a magnetic field by an external force?
Motor.
Rectifier.
Generator.
Inverter.
What would be the flux change that induces an EMF of 150 V and takes 10 ms for the current to fall to zero?
0.15 Wb
1.5 Wb
15 Wb
150 Wb
What does the value B indicate in the figure shown?
Average value of the waveform.
Periodic time of the waveform.
RMS of the waveform.
Peak amplitude of the waveform.
Which electronic component is used to amplify low level signals from a PIR detector to higher levels that can trigger the alarm circuit?
Thyristor.
Capacitor.
Transistor.
Resistor.
Which electronic component is used in a remote-control device to pulse a pattern that a receiver recognises and responds accordingly?
Zener diode
Photo diode
Thermonic diode
Light Emitting Diode
Which electronic components resistance will vary significantly more than standard resistors with temperature?
Thermister
Capacitor
Transistor
Inverter
Which electronic component is a semiconductor that converts light into current?
Zener diode
Photo diode
Capacitor
Transistor
