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Quiz On Safeguard

Total questions: 26

Worksheet time: 16mins

Name
Class
Date
1.
1. Electrical appliances can pull current even when they are turned off, costing you mone
a)
a. true
b)
b. false
2.
5. What percentage of energy must a dishwasher save in comparison to the federal standard in order to get an Energy Star rating?
a)
a. 10
b)
b. 20
c)
c. 30
d)
d. 40
3.
Guess the word
a)
gas stove
b)
dishwasher
c)
microwave oven
d)
remote control
4.

How much energy does this appliance transfer per second?

a)

240 V

b)

50 Hz

c)

130 W

d)

N533

5.
What is the unit of measurement for power?
a)
Joules
b)
Watts
c)
Voltage
d)
Calories
6.
Which appliance transfers the most energy per second? 
a)
Clock
b)
Lamp
c)
Desktop Computer
d)
Iron
7.
What is the unit of energy that electrical companies use?
a)
kJ
b)
kW
c)
kJ/hour
d)
kW/hour
8.
A kettle transfers 1000J of energy every 2 seconds. Calculate its power.
a)
2000 Watts
b)
1000 Watts
c)
500 Watts
d)
cannot be determined
9.
A material that DOES NOT let electricity pass through is called...
a)
An insulator
b)
A conductor
c)
An appliance
10.
Why would it be dangerous to touch a plug socket with wet hands?
a)
Because your hands will be too slippy to press the switch.
b)
Because you have a high chance of being electrocuted.
c)
It wouldn't be dangerous.
11.

It is materialthat has an electrical conductivity value falling between that of a conductor, like copper, gold, etc. and an insulator, such as glass.

a)

A semiconductor material

b)

Conductive material

c)

Insulator material

d)

No Idea

12.

It means stopping the supply to an appliance where anyone can operate it when needed.

a)

Isolation

b)

Connection

c)

Electrical safety

d)

Testing procedures

13.

When an imbalance of current is detected in a circuit or appliance, the supply is isolated.

a)

RCD

b)

Isolating transformers

c)

Circuit breakers

d)

RCBO

14.

It is commonly used in applications where there is the need to combine protection against overcurrents (overload and short-circuit) and protection against earth leakage currents.

a)

RCD

b)

Isolating transformers

c)

Circuit breakers

d)

RCBO

15.

Isolates the supply from earth to protect the user from a potential voltage between earth and the live conductors.

a)

RCD

b)

Isolating transformers

c)

Circuit breakers

d)

RCBO

16.

Electrical switch, automatically operated to protect circuits and the electrical equipment connected to it from damage caused by excess current, typically overload or short circuit.

a)

RCD

b)

Isolating transformers

c)

Circuit breakers

d)

RCBO

17.

Provides protection to other services such as data, water and gas by requiring min distances and installation techniques that reduce damage and interference to other services.

a)

Protection of underground cables

b)

Electrical barriers

c)

Service segregation

d)

Protection of electrical circuits and equipment

18.

What is the voltage different between Live and Neutral at secondary side of 230/230 Isolating transformer ?

a)

0

b)

230

c)

400

d)

290

19.

What is the voltage different between Live and Neutral at Primary side of 230/230 Isolating transformer ?

a)

0

b)

230

c)

400

d)

290

20.

What is the minimum insulation resistance between the primary and secondary windings of a fixed wired isolation transformer

a)

1 M-ohm

b)

2 M-ohm

c)

3 M-ohm

d)

999 M-ohm

21.

What are the bonding and earthing requirements when more than one appliance is supplied from an isolating transformer?

a)

The exposed metal of the appliances shall be effectively bonded together and earthed.

b)

The exposed metal of the appliances shall be effectively bonded together but not earthed.

c)

Only earthed

d)

No Idea

22.

Ideally, how many appliances should you have attached to an isolating transformer at any one time?

a)

1

b)

2

c)

3

d)

4

23.

Metal part of Double insulation electrical appliance can be grounded

a)

True

b)

False

c)

No problem

d)

It is okay

24.

Refer to Figure , Identify the class of appliance

a)

Class I

b)

Class II

c)

Class III

d)

No idea

25.

Refer to Figure , Identify the class of appliance

a)

Class I

b)

Class II

c)

Class III

d)

No idea

26.

Refer to Figure , Identify the class of appliance

a)

Class I

b)

Class II

c)

Class III

d)

No idea