Welcome to your 2365 602 Electrical Science

1.
Parallel to the supply
Series with the load
Across the circuit
Series with the supply

A Voltmeter is connected?

2.
The time taken for one cycle
The number of cycles per second
The maximum peak period
The time from one peak to the next

Which of the following statements describes the frequency of a waveform?

3.
32.8A
30.4A
50A
70A

A cooker has 4 x 1.5 kW hot plates, a 2 kW grill and a 3.5 kW oven. If the cooker is supplied from a 230 V ac supply, what is the maximum current drawn by the cooker?

4.
20.47A
20470A
0.39A
2.58A

What is the value of the Current flow in the circuit diagram?

5.
Decrease
Increase inversely to the amount of turns
Remain unchanged
Increase

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is increased, the voltage induced across the coil will?

6.
Diac
Diode
Triac
Resistor

Which of the following electronic components allows to flow in one direction only?

7.
89Ω
9.25Ω
89A
9.25A

What is the value of the total resistance in the diagram?

8.
2ms
20ms
50ms
100ms

How long will a single rotation of a generator take with the frequency of 50Hz?

9.
80m
10m
28.28m
57.01m

In the triangle shown what is the length of side 'A'?

10.
Negative
Alternating charge
Neutral
Positive

What charge does an electron have?

11.
3000rpm
1500rpm
1000rpm
16.67rpm

A 6 pole three-phase alternator is to give an output of 50Hz. It must be driven at a speed of?

12.
EMF, pd and voltage are measured using different unit
Current cannot flow without pd
Current actually flows from positive to negative
Voltage cannot be present without current

Which ONE of the following statements is true?

13.
Series to the supply
Series with the load
Across the circuit
Parallel to the load

A Voltmeter is connected?

14.
16A
6.9A
9.17A
0.11A

What is the value of I2?

15.
13.0A
18.6A
21.5A
25.2A

A circuit dissipates 3kW at a power factor of 0.7 when connected to a 230V a.c. supply. The current flowing in the circuit will be?

16.
Positive difference
Potential difference
Potential divider
Positive divider

What is pd?

17.
Length, mass, resistivity, cross-sectional area
Resistivity, length, cross-sectional area, temperature
Temperature, cross-sectional area, distance, atoms
Resistivity, mass, length, cross-sectional area

The resistance of a conductor is dependent on four factors?

18.
Diac
Diode
Thyristor
Resistor

Which of the following electronic components are used to control or reduce current flow?

19.
Average value of the waveform
Periodic time of the waveform
RMS value of the waveform
Peak Value of the waveform

Refer to the figure shown. What does value 'B' indicate?

20.
Coulomb
Ampere
Farad
Joule

What is the SI unit of measurement for Energy?

21.
Class 0
Class 1
Class 2
Class 3

Which best describes the lever in the diagram?

22.
P = (F x D)/t
P=D/W
P = t/W
P = t/F x D

What is the formula for mechanical power?

23.
Class 2 Lever
Class 1 Lever
Class 3 Lever
Universal Lever

If a lever has a fulcrum in the middle between the force and load it is known as a?

24.
550Ω
59Ω
700Ω
70Ω

A series circuit consists of three resistors with values of 100Ω, 250Ω and 350Ω. The total resistance is?

25.
16A
6.9A
9.17A
0.11A

What is the value of It?

26.
Amperes/watts
Amperes x watts
Watts/amperes
Watts x amperes

Which one of the following is used to determine the voltage in a circuit?

27.
W
V
A
K

What is the SI unit of measurement symbol for Temperature?

28.
A photo diode
An Opto-coupler
A fibre optic link
A capacitor

An electronic device used to detect changes in levels of light is?

29.
713Ω
74.19Ω
0.01Ω
999MΩ

A boiler supplied from 230V will draw 3.1A, what will the resistance be?

30.
Crowbar
Wheelbarrow
Tweezers
Nutcracker

An example of a class 1 Lever is?