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Protection Method Part 2

Total questions: 20

Worksheet time: 11mins

Name
Class
Date
1.

To prevent accidents and injuries in the workshop you must understand and follow

safety rules

a)

TRUE

b)

FALSE

2.

Electric Shock occurs when a person becomes part of the.....?

a)

Live circuit

b)

Dead circuit

c)

Incedent

d)

Neutral ciruit

3.

The earthing conductor OR Circuit Protective Conductor (CPC) have to be secure

To ensure operation of circuit protection device.

a)

TRUE

b)

FALSE

4.

Which Device in below is the Indicator of earth leakage.

a)

RCD

b)

MCB

c)

CT

d)

RCM

5.

An RCBO provide protection against earth Fault and over current

a)

TRUE

b)

FALSE

6.

For a 20A, Type C Miniature circuit Breaker the Iz value equal to ......

Note: in this question. You have to know how to calculate the Iz value to get correct answer

a)

100A

b)

200A

c)

250A

d)

150A

7.

RCD is classed as a basic protection method.

a)

TRUE

b)

FALSE

8.

The Zs for 10mA RCD is 50 ohms.

Note: in this question. You have to know how to calculate the Zs value to get correct answer.

a)

TRUE

b)

FALSE

9.

S- Type RCD also known as ...?

a)

Advance type RCD

b)

Expensive type RCD

c)

Portable type RCD

d)

Delay type RCD

10.

Green/Yellow wire (Earthing wire) is always considered as a....?

a)

part of the live circuit.

b)

Not part of live circuit.

c)

part of neutral line.

d)

part of lightning circuit.

11.

Direct contact with power point need to use RCD with earth fault current rate of .......?

a)

10mA

b)

100mA

c)

300mA

d)

30mA

12.

MCB Tripping characteristics set during ....?

a)

manufacture process.

b)

Shipping process.

c)

using on site process.

d)

storing process

13.

The fuses and MCBs are connected to.....?

a)

Neutral wire

b)

Live wire

c)

Earth wire

d)

Ground wire

14.

British Standard (BS 1361, BS 1362 and BS 88) related to:

a)

MCB

b)

Fuse

c)

RCD

d)

Earthing

15.

The fuse wire is enclosed in a transparent glass tube or bulb, and the whole unit is sealed off called?

a)

Atmosfer fuse

b)

Rewirable fuse

c)

cartridge fuse

d)

None of all mentioned

16.

Is the circuit breaker a usable device?

a)

yes

b)

No

17.

The RCD is not classed as abasic protection class

a)

TRUE

b)

FALSE

18.

The British standard 3036 is related to ....?

a)

Cartridge fuse

b)

Rewirable fuse

c)

Non- rewirable fuse

19.

The fuses are ....?

a)

Reusable units.

b)

None protection units

c)

Controlling units

d)

Sacrificial units

20.

The setting of the motor overload unit done according to ...?

a)

Motor FLC

b)

Motor FLV

c)

Motor torque

d)

Motor frequency