The principle of operation of residual current devices

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Reference no: EM132176

QUESTION 1

A worker has received an electric shock from a 240 volt portable drill whilst installing a set of wooden shelves

(a) State five factors that determine the severity of the effects of an electric shock

(b) State five possible physical effects the worker may have suffered from the accident

(d) Outline the precautions that could have been taken to prevent the accident

(e) State the principle of operation of each of the following protective devices

Residual current devices
Fuses

QUESTION 2

In a factory a conveyor system is used to transfer manufactured articles to the warehouse area. (a) Identify typical mechanical hazards when the conveyor is in use

(b) Identify the control measures to be taken to reduce the risk of injury to workers from the conveyor.

(c) Members of the public have been injured when collecting baggage from a baggage conveyor at an airport. Describe in how the control measures that could be implemented here would differ from those taken in the warehouse.(d) Outline the factors that may cause an agricultural tractor to overturn.(e) Outline the measures that may be necessary to minimise the risk of a tractor overturning

QUESTION 3

If pressure equipment fails in use, it can seriously injure or kill people nearby and cause serious damage to property. Each year in Great Britain, there are about 150 dangerous occurrences involving such unintentional releases. Around six of these result in fatal or serious injury

(a) Give five examples of pressure systems

(b) State five common causes of structural failure in pressure systems

(d) What is the purpose of non-destructive testing on items of a plant?

(e) State the principles, benefits and limitations of the following NDT techniques

Dye penetrant
Radiography

Reference no: EM132176

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