Sample Questions 356 Flashcards
Name four maintenance activities. ( 4 Marks)
Answer:
Maintenance activities: carrying out routine servicing schedules or planned preventative maintenance, repair and replacement following breakdowns, monitoring and performance testing
Describe three benefits of carrying out maintenance. (6 marks)
Answer: Suitable description of any three of the following
benefits: upholding or improving safety standards, maintaining production output at the required levels and quality, maximising the useful working life of engineering assets, increasing production efficiency
Describe one documentary and one physical method of ensuring safe working before commencing maintenance. (5 marks)
Answer: Suitable description of one of each of the following.
Physical: isolating power or pressure sources, barriers etc.
Document: Permit to work / authorisation.
List five different resources required to carry out maintenance activities. (5 marks)
Answer: Any five of the following:
Time, people (suitably trained, other trades etc.), tools, materials, equipment, spares, space, support, facilities etc.
State two factors to consider when selecting a suitable site before installing any new equipment and machinery. (2 marks)
Any two: Factors to consider: site conditions and locations, storage of parts and materials, tools and equipment, provision of services – electricity, compressed air, water and drainage, minimising disruption to adjacent work areas.
Describe how one of the factors in part a) would affect the length of time needed to install new plant and equipment. (2 marks)
Adequate description covering, e.g. for provision of services there would need to be resource (time, people, e.g. sub-contractors etc.) factored in for the extension of supply
cables/pipelines etc. For minimising disruption there may be access arrangements to consider or protect others from the effects of the installation activities.
Any sensible answer that links the factor to consider and the implications of them.
Describe two activities that should be carried out before the installation of a fixed air compressor. (4 marks)
Suitable descriptions covering two of the following:
Evaluation of site conditions, provision of services for the prime mover, storage of parts, tools and equipment or other suitable answer
Describe fully one piece of information which may be found in a maintenance report. (3 marks)
Adequate description of one of the following.
Work undertaken, location(s), dates/times (commencement, completion and handover), parts and consumables used, test data, work outstanding defects rectified, any certification referencing.
Describe two symptoms that would suggest a fault has occurred or is developing. (4 marks)
Two appropriate descriptions given, for example:
Symptoms from overheating, excessive vibration, noise, obvious damage or deterioration, smell (e.g. burning or leaking gases etc.) or any sensible answer.
Causes Physical damage from external sources, lack of maintenance or other valid reason linked to maintenance, poor alignment of components, poor protection from conditions/elements, personnel training issues, quality issues with components, wrong components, any other sensible cause.
Name a suitable instrument used to measure rotational speed.
Tachometer/ stroboscope
Name a suitable instrument used to measure temperatures above 400°C.
Pyrometer / electrical resistance device.
Name a suitable instrument used to measure Pressure.
Bourdon gauge or manometer.
Give one application where each of the instruments named in part a) would be used. (3 marks)
Any sensible application, for example:
i) To measure engine speed/timing.
ii) To measure exhaust temperatures.
iii) To measure compressed air, steam pressure etc. or to measure pressure difference.
Explain the purpose of calibration. (3 marks)
To determine the accuracy of the unit under test compared to that of one of known magnitude or correctness and inform the user of the results (or similar answer)
Give three reasons why it is important to use calibrated instruments. (3 marks)
In order to determine accurate measurement, quality assurance of measurement, confidence for the user of the equipment (any other sensible answers).
Describe two applications where a Dial Test Indicator (DTI) would be used. (4 marks)
Answer: Two descriptions of the instrument’s application, for example set up and use in a suitable situation such as trueing of components held in a four jaw chuck or to align coupling flanges or other suitable descriptions.
List four checks that should be carried out when re-commissioning an air compressor after maintenance. (4 marks)
Answer: Any four:
Freedom of movement, check security of mountings or components, reconnect electrical supply, reestablish compressed air distribution system, work area cleared of all tools, materials and equipment, cancellation of work permit, system running check, any other sensible answer.
Explain, with the aid of a sketch, how friction is caused between two surfaces in contact. (3 marks)
Answer: Explanation similar to the following.
The contact surface area of the peaks causes the initial friction. Then the breaking or merging of peaks would require a force that would generate additional heat.
Sketch should show peaks on both surfaces.
State one reason for lubrication. (1 mark)
Answer: Any one:
To separate component parts, to remove/reduce heat, prevent ingress of dirt, prevent corrosion.
Explain briefly Splash lubrication.
Internal combustion engine or gearbox to cater for high speeds and temperatures etc. (any other sensible answer).
Explain briefly Mist lubrication
Used in compressed air systems, most effective method for lubricating air tools (any other sensible answer).
Explain briefly grease
Exposed shaft bearings such as in conveyers or ventilating systems – high speed motion without need for oil/sealed/prevents ingress of dirt etc. (any other sensible answer).
With reference to lubricants. State the nomenclature terms for the following. Resistance to flow.
Viscosity.
With reference to lubricants. State the nomenclature terms for the following. Temperature reached where lubricant will ignite if in contact with a flame.
Flash point