Optimization Techniques MCQ Part-5
(Replacement Theory)
1. Replacement decision is very much common in this stage
(a) Infant stage
(b) Old age
(c) Youth
(d) In all the above
2. The replacement policy that is imposed on an item irrespective of its failure is
(a) Group replacement
(b) Individual replacement
(c) Repair spare replacement
(d) Successive replacement
3. The total number of allocations in a basic feasible solution to the
transportation problem of m×n size is equal to
(a) m×n
(b) mn-1
(c) m+n+1
(d) m+n-1
4. Contractual maintenance or agreement maintenance with the manufacturer
is suitable for equipment, which is
(a) In its infant state
(b) When a machine is an old one
(c) Scrapped
(d) None of these
5. Which of the following maintenance policy is not used in the old age stage of a machine
(a) Operate up to failure and do corrective maintenance
(b) Reconditioning
(c) Replacement
(d) Scheduled preventive maintenance
6. The following replacement model is said to be a probabilistic model
(a) When money value does not change with time and time is a continuous variable
(b) When money value changes with time
(c) When money value does not change with time and time is a discrete variable
(d) Preventive maintenance policy
7. A machine is replaced with an average running cost
(a) Is not equal to the current running cost
(b) till the current period is greater than that of next period
(c) of the current period is greater than that of the next period,
(d) of the current period is less than that of next period
8. Decreasing failure rate is usually observed in ………………. stage of the machine
(a) infant
(b) youth
(c) old age
(d) any time in its life
9. The type of failure that usually occurs in old age of the machine is
(a) Random failure
(b) Early failure
(c) Chance failure
(d) Wear - out failure
10. The production manager will not recommend group replacement policy in case of
(a) When large number of identical items is to be replaced
(b) Low cost items are to be replaced, where record keeping is a problem
(c) For items that fail completely
(d) Repairable items
11. Which of the following replacement policies is considered to be dynamic in nature?
(a) Time is a continuous variable and the money value does not change with time
(b) When money value does not change with time and time is a discrete variable
(c) When money value changes with time
(d) When money value remains constant for some time and then goes on changing with time
12. When the probability of failure reduces gradually, the failure mode is said to be
(a) Regressive
(b) Retrogressive
(c) Progressive
(d) Recursive
13. ............................... is concerned with the determination of the most economic replacement policy.
(a) Probabilistic programming
(b) Linear programming
(c) Search theory
(d) Replacement theory
14. Which cost of the following is irrelevant to replacement analysis?
(a) Purchase cost of the machine
(b) Operating cost of the machine
(c) Maintenance cost of the machine
(d) Machine hour rate of the machine
15. Group replacement policy is most suitable for
(a) Trucks
(b) Infant machines
(c) Street light bulbs
(d) New cars
16. Replacement of an item will become necessary when
(a) an old item becomes too expensive to operate or maintain
(b) when your operator desires to work on a new machine
(c) when your opponent changes his machine in his unit
(d) when the company has surplus funds to spend
17. The following is not discussed in group replacement policy
(a) Failure Probability
(b) Cost of individual replacement
(c) Loss due to failure
(d) Present worth factor series
18. It is assumed that maintenance cost mostly depends on
(a) calendar age
(b) manufacturing date
(c) running age
(d) user’s age
19. In replacement analysis the maintenance cost is a function of
(a) time
(b) resale value
(c) initial investment
(d) none of these
20. Which of the following is the correct assumption for replacement policy when money value does not chang
(a) No Capital cost
(b) No scrap value
(c) Constant scrap value
(d) Zero maintenance cost
21. Which one of the following does not match the group?
(a) Present Worth Factor (PWF)
(b) Discounted rate (DR)
(c) Depreciation value (DV)
(d) Mortality Tables (MT)
22. Group replacement policy applies to
(a) Irreparable items
(b) Repairable items
(c) Items that fail partially
(d) Items that fail completely & suddenly
23. If a machine becomes old, then the failure rate expected will be
(a) Constant
(b) Increasing
(c) decreasing
(d) we cannot say
24. Replacement is said to be necessary if
(a) Failure rate is increasing
(b) Failure cost is increasing
(c) Failure probability is increasing
(d) Any of these
25. In this stage, the machine operates at highest efficiency and its production rate will be high
(a) Infant stage
(b) Youth stage
(c) Old age
(d) None of these
26. In retrogressive failures, the failure probability ......................... with time
(a) increases
(b) remains constant
(c) decreases
(d) none of these
