NEBOSH INTERNATIONAL GENERAL CERTIFICATE
– IG2
Week 2: Elements 9
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Guide to Review Questions
The Review Questions provided as a Learner Resource are designed to test learners’ knowledge and
understanding of each topic (element by element). They can be used to stimulate discussion in the
classroom or provided as a take-home exercise to be completed individually.
The Review Questions are based on the Study Questions contained in the RRC Study Text. You also
have access to the Suggested Answers to these Questions at the end of that study text.
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Element 9: Work Equipment
1. Why are maintenance workers sometimes at greater risk than operators when working
on machinery?
Maintenance workers are at greater risk when working on machine due to when
the maintenance job is in progress the guards and protective devices are carried
off and worker has to do it by their own mean of safety and precautions.
2. What are the general health and safety responsibilities of machine operators?
Never take off the guards during work.
Use proper protective equipment for the use of machinery.
Must inspect the machine before use.
Be aware of the environment during machine operations.
3. (a) From what do the risks in the use of hand tools arise?
Use of iron or steel tools near any flammable substances are high risk.
Ergonomics issue may occur to the worker doing hand tool job due to the irrelevant
posture to use.
Breaking of the tool while using.
Use right tool for the right job.
Repair the damaged or worn tools for safe job.
(b) From what do the additional risks of portable power tools arise?
Contact of tool with the person.
Rough handling of tools.
No proper maintenance and inspection of tools.
Noise hazards of the power tools.
Vibration of the tool.
Dust issue while using.
Electric shock hazards while using.
Safety guards of the tool must be proper attached and in right place.
Wire and receptacles should be proper.
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4. Why might each power tool be marked?
Marking the power tools helps in identification, inspection, to maintain the record of
maintenance of tools.
5. List the non-mechanical hazards arising from the use of machinery.
Noise, dust, vibration, ionization radiations, ergonomics, extreme temperatures.
6. What are drawing-in injuries?
Drawing in injuries are those which does come due to excessive drawings or drawing in
an unhealthy way. It could be carpel tunnel, wrist pain, tennis elbow and ergonomics.
7. What is the hierarchy of protective measures?
Avoid risks, eliminate the hazards, minimise he hazards, keep the person away
from hazards, improve safe behaviour of work.
8. Describe the principles of an interlocking guard system.
Safety interlock switch interlocks a guard door with the power source of hazard, when
the guard door is opened the power will be isolated ensuring that the machine is safe
and secure when the operator wants access.
9. What is a trip device?
Trip devices are basically devices used for emergency shutdown.
It is usually used with the machine equipped with fully revolution clutches
10. What are the limitations of adjustable guards?
It can interfere in visibility.
Can be limited to specific operations.
Machine maintenance often required its removal.
May require frequent maintenance and repair.
May not protect against non-mechanical hazards.
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11. What are protective appliances?
Guarding, safety interlock systems, laser scanners, trip devices, emergency stop buttons,
safety controllers, energy isolation equipment’s, light indicators, safety mats, edges,
bumpers.
12. When are operators required to be trained in the use of safety equipment?
According to the safety and health regulations of construction 1926, the employer must
ensure to train the employee before use of machine and monitor at site while operating
equipment.
13. How might two-handed controls be overridden?
Two handed controls are controlled of an operator’s hand during a hazardous motions
by requiring the continuous actuation of two palm button to enable power of the
motor which can be some time overridden due to the lack of concentration, or lack of
training for using the controls.
14. What five requirements are there for any guarding system?
Prevent controls.
Be secure in place.
Create no new hazards.
Allow the sufficient place for cleaning while guard in place.
Not interfere with machine operator.
15. What hazards might arise from the use of the following machines?
(a) Bench top grinder
High speed abrasive wheel with a large amount of energy.
Grinder wheel is hot just after use.
During work may be found dust hazards.
Rotating parts can leave potential for entanglement hazards for loose clothing.
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(b) Chainsaw
Contact injuries while using.
Kick back when chainsaw blade comes in contact with any object.
Debris during work and after work.
Fatigue.
(c) Bench-mounted saw
Cuts if contact with the blade.
Injury as a result on entanglement with loose clothing.
Noise hazards.
Hand arm vibration due to excessive use.
Eye injuries due to cutting dust.
16. List the PPE that should be worn when using a chainsaw
Safety helmet
Safety goggles.
Steel toed shoes.
Face mask.
Anti cut gloves.
Ear protection.
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More Questions
Question 1
Maintenance is often seen as a “high-risk” activity. What is it about maintenance work that increases
the risk?
In the maintenance activity person has to remove the safety guards and devices from the machine.
By doing that person is now having a direct contact of hazards of the machine to him, so for this
maintenance person has to be properly trained.
Question 2
Discuss:
•
What accidents can occur with hand-held tools, and
•
How the tools became damaged.
1- While using hand held tools accidents may be of minor injuries or major due to the wrong
use of tools on wrong places, not having proper safety equipment’s for work, use of
damaged tools.
2- Tools became damaged because of excessive use and not taking care of the tools.
hand made tools are basically locally made tools and can be damaged anytime so their repairing
must be priority for the person managing teams, workers must also follow to not use damaged
tools for work.
Question 3
What are the non-mechanical hazards which are associated with machinery?
Electricity
Noise
Vibration
Hazardous substance
Ergonomics
Extreme temperatures
Slip trip and falls
Fire and explosion
Chemical hazards
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Question 4
1.
Identify the mechanical hazards.
2.
Identify the non-mechanical hazards.
1- cutting, entanglement hazard, abrasive hazards.
2-Noise, electricity, fire and explosion, vibration, ergonomics.
Question 5
Apart from the mechanical hazards, what hazards can fixed guards provide protection against?
Entanglement of loose clothing’s.
Electric shocks.
Vibration.
Dust hazards.
Noise hazards.
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Question 6
Choose one of the ‘specific machines’ and outline:

The hazards (mechanical and non-mechanical).

Control measures.
Chainsaw:
Hazards: noise, vibration, CO poisoning, electric shocks, kickbacks.
Control measures: wear proper PPEs related to chainsaw use, don’t work alone, never carry
it when its working, never saw above shoulder height, never use faulty equipment.
Question 7
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Identify the types of guards and protective devices.
PROTECTIVE DEVICES:
Guarding
Emergency stop
Safety interlock switches.
SAFETY GUARDS:
Fixed guards.
Power transmission guards.
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