1. Define maintenance?
Maintenance is the routine and recurring process of keeping a
particular machine or asset in its normal operating conditions
So that it can deliver the
expected performance or service without any loss or damage.
2. Define reliability?
Reliability is defined as the probability that a component
/system, when operating under given condition, will perform its intended
functions adequately for a specified period of time. It refers to the like hood
that equipment will not fail during its operation.
3. State the benefits of
reliability analysis in industries?
The main advantages of imposing reliability requirements are
increased productivity and reductions in forced outage equipment due to planned
maintenance activity.
4. Define failure rate?
Failure rate is the ratio of the number of failures during
particular unit interval to the average population during that interval.
This failure rate is also known
as hazard rate and instantaneous failure rate.
5. What is Mean Failure Rate?
The mean failure rate h is obtained by finding the mean of the
failures rates for specified period of time.
h = (Z1 + Z2 + Z3+....+ZT) / T
where Zt represents
failure rates over the specified
period of time T.
6. Define Mean Time to Failure.
Let t1 is the time to failure for the first specimen, t2 is
the time to failure for the second specimen and t n is the time to failure
for the Nth specimen. Hence the
mean time to failure for N specimens are MTTR = (t1+t2+......+t N) /N
7. What is Mean Time between
Failures (MTBF)?
Mean Time between Failures (MTBF) is the mean or average time
between successive failures of a product. Mean time between failures refers tom
the average time of breakdown until the device is beyond repair.
8. Define Mean Time to Repair
(MTTR)?
Mean Time to Repair is the arithmetic mean of the time
required to perform maintenance action. MTTR is defined as the
Ratio of total maintenance time and number of maintenance
action.
MTTR
= Total maintenance time/ Number of maintenance action.
9. Define Maintenance Action Rate?
Maintenance action rate is the
number of maintenance action that can be carried out on equipment per hour.
10.
Define Failure Density?
Failure Density is the ratio of
the number of failures during a given unit interval of time to the total number
of items at the very beginning of the test.
11.
State the types of reliability?
Reliability
can be generally of two types:
(i) Inherent Reliability:
It is associated with the quality of the material and design of machine parts.
(ii) Achievable Reliability:
It depends upon other factors such as maintenance and operation of the equipment.
12.
Draw the equipment life cycle and name the various phases ln it?
Phase I - Failure pattern
inherent in a new product because of manufacturing or design defects.
Phase
II - Life period of an equipment
Phase III -
Failures due to wear
out conditions because to
aging of the
equipment.
13.
Define maintainability?
Maintainability is defined as the
probability that a unit or system will be restored to specified working
conditions within a given period when maintenance action is taken in accordance
with the prescribed procedures and resources.
14.
Define availability?
Availability is the ratio of the time at which equipment is
available for the designated operation/service to the total time of operation
and maintenance of the equipment. It is also defined as the ratio of equipments
uptime to the equipment uptime and downtime over a specified period of time.
15. State the advantages of life cycle cost analysis.
(i) Integration of engineering, economics and
financial aspects lead to the way of robust metric for the selection and
purchase equipment required for the industry.
(ii) Reduced
operating and maintenance cost of equipments due to cost analysis over span of time.
(iii) It leads
to the selection of proper and economically viable equipment.
16.
Draw the curve to determine the economic life of
equipment?
The economic life of equipment
depends on the maintenance and repair costs, availability and operational
efficiency. A plot of cumulative efficiency and maintenance and repair cost per
cumulative hours Vs operating hours of the equipment to find the economic life
of the equipment is shown in the figure.
17.
State the components of maintenance cost?
The
maintenance cost is comprised of two factors:
(i) Fixed
cost: This includes the cost of support facilities including the
maintenance staff.
(ii)
Variable cost: This
includes the consumption of spare parts, replacement of components and cost
other facilities requirements of maintenance.
18.
State the role of maintenance budget
The maintenance budget is used to
set aside certain amount of money to meet the expenditures incurred in
achieving the objectives of maintenance.
19.
State the types of maintenance budget?
(i) Appropriation
Budget: Budget used to allocate money for each activity
independently.
(ii) Fixed
Budget: Fixed used to allocate money for a specified period of time.
(iii)Variable Budget: Dynamic allocation of
expenditure based on maintenance requirements and activities.
20.
List the main factors of maintenance cost?
The
maintenance cost is comprised of two factors:
(i) Fixed
cost: This includes the cost of support facilities including the
maintenance staff.
Variable cost: This includes the consumption
of spare parts, replacement of components and cost other facilities
requirements of maintenance.
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.