Free Printable Electrical Principles Short A2

1.

From a bundle of 3m length conduit with 50 lengths you have used 16 lengths for an installation.

What percentage of conduit has been used?

a)

8%

b)

16%

c)

40%

d)

32%

2.

An Ammeter is used to record the following values:

60A, 88A, 45A, 10A, 13A and 100A. What is the mean of

these values?

a)

316A

b)

52.6A

c)

45A

d)

59.7A

3.

The Si unit for capacitance is what?

a)

Farads

b)

Ohms

c)

Henrys

d)

Amperes

4.

The unit of measure for EMF is what?

a)

Amperes

b)

Volts

c)

Ohms

d)

Farads

5.

What is the indices required to represent $m^2$ when $mm^2$ has been used?

a)

$\times10^{-3}$

b)

$\times10^{-9}$

c)

$\times10^{-6}$

d)

$\times10^{-12}$

6.

Which instrument would be used to measure the current in an electrical circuit?

a)

Ohm Meter

b)

Watt Meter

c)

Voltage Meter

d)

Ammeter

7.

A load generates a force of 800 Newton’s. Calculate the mass of the load

a)

81.55 kg

b)

7848 kg

c)

1131.54 kg

d)

98.69 kg

8.

An electric motor in a car production plant uses 600,000 Joules of energy in 2 ½ minutes. What is the power rating of the motor?

a)

2 kW

b)

3 kW

c)

4 kW

d)

5 kW

9.

An electric motor has a 6.2 kW input and has a really poor efficiency of 59%. What is the motor’s output?

a)

4.789 kW

b)

5.743 kW

c)

3.658 kW

d)

2.952 kW

10.

A three pulley system is required to lift a load force of $80\times10^3$ Newton’s.

What is the effort force required to lift this load?

a)

26.7 kN

b)

26.7 N

c)

2.67 kN

d)

2.67 N

11.

A set of gears has 2 cogs the driving cog has 28 teeth and the driven cog has 140 teeth. What is the ratio of the gears?

a)

1:7

b)

28:100

c)

1:5

d)

16:140

12.

Two copper conductors are connected in parallel. Each conductor has a resistance of 1.76 $\Omega$ What is the combined resistance of the two conductors?

a)

$1.136\Omega$

b)

$1.66\Omega$

c)

$0.88\Omega$

d)

$0.76\Omega$

13.

A good conductor has which of the following?

a)

protons are loosely bound to the nucleus.

b)

electrons are loosely bound to the nucleus

c)

protons are tightly bound to the nucleus.

d)

electrons are tightly bound to the nucleus.

14.

Which 2 effects would cause a circuit breaker to operate?

a)

Solar / thermal

b)

Thermal / chemical

c)

Thermal / magnetic

d)

magnetic / chemical

15.

If a conductor was moved in the direction shown by the arrow through this magnetic field, which direction would the current flow?

a)

away from us

b)

toward us

c)

left to right

d)

right to left

16.

What is magnetic flux measured in?

a)

Weber

b)

Tesla

c)

ohms

d)

Farads

17.

Potential difference x Current is a calculation for what?

a)

Force

b)

EMF

c)

Voltage

d)

Power

18.

What is labelled on the diagram as C?

a)

Peak to Peak

b)

The period

c)

RMS

d)

Peak

19.

The coloured lines on the diagram represent the average and the RMS value. Which colour is the RMS in this example?

a)

Red

b)

Blue

20.

Where is the north pole on this diagram?

a)

A

b)

B

c)

C

d)

D

Electrical Principles Short A2

Total questions: 20

Worksheet time: 40mins

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