In an MRP system, component demand is:

established by the master production schedule

calculated by the MRP system from the master production schedule

All of the following are considered non-productive activities relating to equipment excepts

setting up or breaking down a machine

waiting for workers or material

all of the above are non-productive activities

A factory produces m (i = 1, 2, ..., m) products, each of which requires processing on n (j = 1, 2, ..., n) workstations. Let aij be the amount of processing time that one unit of the ith product requires on the jth workstation. Let the revenue from selling one unit of the ith product be ri and hi be the holding cost per unit per time period for the ith product. The planning horizon consists of T (t = 1, 2,..., T) time periods. The minimum demand that must be satisfied in time period t is dit, and the capacity of the jth workstation in time period t is cjt. Consider the aggregate planning formulation below, with decision variables Sit (amount of product i sold in time period t), Xit (amount of product i manufactured in time period t) and Iit (amount of product i held in inventory at the end of time period t).\({\rm{max}}\mathop \sum \limits_{t = 1}^T \mathop \sum \limits_{i = 1}^m \left( {{r_i}{S_{it}} - {h_i}{I_{it}}} \right)\)Subject toSit ≥ dit ∀ i, t Xit, Sit, Iit ≥ 0; Ii0 = 0The capacity constraints and inventory balance constraints for this formulation respectively are

\(\displaystyle\sum_i^m a_{ij}X_{it} \le c_{jt} \ \forall \ i, t\) and \(I_{it} = I_{i, t-1} + X_{it} - d_{it} \ \forall \ i, t\)

\(\displaystyle\sum_i^m a_{ij}X_{it} \le d_{it} \ \forall \ i, t\) and \(I_{it} = I_{i, t-1} + X_{it} - S_{it} \ \forall \ i, t\)

\(\displaystyle\sum_i^m a_{ij}X_{it} \le d_{it} \ \forall \ i, t\) and \(I_{it} = I_{i, t-1} + S_{it}- X_{it} \ \forall \ i, t\)

\(\displaystyle\sum_i^m a_{ij}X_{it} \le c_{jt} \ \forall \ j, t\) and \(I_{it} = I_{i, t - 1} + X_{it} - S_{it} \ \forall \ i, t\)

17 + Mcqs in Production Planning And Inventory Control in Mechanical Engineering Page 1 McqOptions

1.	For a classical (Wilson) model of determining economic order quantity (EOQ), the carrying and ordering costs are Cr and Co, respectively. For an annual demand D, the minimum yearly total inventory cost is
A.	\(\sqrt{DC_0C_r}\)
B.	\(\sqrt{1.5DC_0C_r}\)
C.	\(\sqrt{2DC_0C_r}\)
D.	\(\sqrt{3DC_0C_r}\)
Answer» D. \(\sqrt{3DC_0C_r}\)

Discussion

2.	Actual observed time for an operation time was 1 min/piece. If the performance rating of the operator was 120 and a 5% personal time is to be provided, the standard time in min/piece is
A.	1
B.	1.2
C.	1.25
D.	1.26
Answer» E.

Discussion

3.	Among the effects of design specifications on costs, which one of the following is the most significant that influences the producibility of end product?
A.	Standard size
B.	Large tolerance
C.	Breakeven point
D.	Cost estimate
Answer» C. Breakeven point

Discussion

4.	In an MRP system, component demand is:
A.	forecasted
B.	established by the master production schedule
C.	calculated by the MRP system from the master production schedule
D.	ignored
Answer» D. ignored

Discussion

5.	Assignment of work to manpower and machinery is known as
A.	scheduling
B.	loading
C.	reporting
D.	none of these
Answer» C. reporting

Discussion

6.	A component can be produced by any of the four processes I, II, III and IV. The fixed cost and the variable cost for each of the processes are listed below. The most economical process for producing a batch of 100 pieces isProcessFixed cost (in Rs.)Variable cost per piece (in Rs.)I203II501III402IV104
A.	I
B.	II
C.	III
D.	IV
Answer» C. III

Discussion

7.	Life reliability of product is decided by
A.	Quality assurance
B.	Quality of design
C.	Quality of manufacture
D.	Quality of performance
Answer» E.

Discussion

8.	All of the following are considered non-productive activities relating to equipment excepts
A.	setting up or breaking down a machine
B.	maintaining the machine
C.	waiting for workers or material
D.	all of the above are non-productive activities
Answer» E.

Discussion

9.	In order to indicate the sequence of events and movements of men, material, etc., while work is being accomplished, the recording technique used is :
A.	Flow diagram
B.	Flow process chart
C.	Gang process chart
D.	Two handed process chart
Answer» B. Flow process chart

Discussion

10.	A factory produces m (i = 1, 2, ..., m) products, each of which requires processing on n (j = 1, 2, ..., n) workstations. Let aij be the amount of processing time that one unit of the ith product requires on the jth workstation. Let the revenue from selling one unit of the ith product be ri and hi be the holding cost per unit per time period for the ith product. The planning horizon consists of T (t = 1, 2,..., T) time periods. The minimum demand that must be satisfied in time period t is dit, and the capacity of the jth workstation in time period t is cjt. Consider the aggregate planning formulation below, with decision variables Sit (amount of product i sold in time period t), Xit (amount of product i manufactured in time period t) and Iit (amount of product i held in inventory at the end of time period t).\({\rm{max}}\mathop \sum \limits_{t = 1}^T \mathop \sum \limits_{i = 1}^m \left( {{r_i}{S_{it}} - {h_i}{I_{it}}} \right)\)Subject toSit ≥ dit ∀ i, t< capacity constraint >< inventory balance constraint >Xit, Sit, Iit ≥ 0; Ii0 = 0The capacity constraints and inventory balance constraints for this formulation respectively are
A.	\(\displaystyle\sum_i^m a_{ij}X_{it} \le c_{jt} \ \forall \ i, t\) and \(I_{it} = I_{i, t-1} + X_{it} - d_{it} \ \forall \ i, t\)
B.	\(\displaystyle\sum_i^m a_{ij}X_{it} \le d_{it} \ \forall \ i, t\) and \(I_{it} = I_{i, t-1} + X_{it} - S_{it} \ \forall \ i, t\)
C.	\(\displaystyle\sum_i^m a_{ij}X_{it} \le d_{it} \ \forall \ i, t\) and \(I_{it} = I_{i, t-1} + S_{it}- X_{it} \ \forall \ i, t\)
D.	\(\displaystyle\sum_i^m a_{ij}X_{it} \le c_{jt} \ \forall \ j, t\) and \(I_{it} = I_{i, t - 1} + X_{it} - S_{it} \ \forall \ i, t\)
Answer» E.

Discussion

11.	Pre-planning stage in production planning and control includes which of the following activities?
A.	Inventory control
B.	Quality control
C.	Demand forecasting
D.	Dispatching
Answer» D. Dispatching

Discussion

12.	Job design means assigning the following tasks of a job to be performed by a worker in his daily routine:I. Job enlargement is the horizontal loading of workers jobII. Job rotation is interchanging amongst workers after a suitable interval of time.III. Job enrichment means giving additional responsibilities to workers who are more dignified.Which of the statements given above are correct?
A.	I and II only
B.	II and III only
C.	I and III only
D.	I, II and III
Answer» E.

Discussion

13.	In the Method study, the symbol is used for:
A.	Operation
B.	Transportation
C.	Delay
D.	Storage
Answer» C. Delay

Discussion

14.	In case of batch production the preferred layout will be
A.	Process layout
B.	Product layout
C.	Combination type layout
D.	Fixed type layout
Answer» B. Product layout

Discussion

15.	In computing Wilson’s economic lot size for an item, by mistake, the demand rate estimate used was 40% higher than the true demand rate. Due to this error in the lot size computation, the total cost of set-ups plus inventory holding per unit time would rise above the true optimum by approximately
A.	1.4%
B.	6.3%
C.	18.3%
D.	8.7%
Answer» D. 8.7%

Discussion

16.	Match the following:P) Process layouti) ship building, aircrafts manufactureQ) Product layoutii) for different types and different sizes of itemsR) Fixed position layoutiii) large varietyS) Combination layoutiv) large quantity
A.	P-ii, Q-iii, R-iv, S-i
B.	P-iv, Q-iii, R-i, S-ii
C.	P-iii, Q-iv, R-i, S-ii
D.	P-iv, Q-iii, R-ii, S-i
Answer» D. P-iv, Q-iii, R-ii, S-i

Discussion

17.	A process layout is generally suggested for
A.	Jobbing work
B.	Batch production
C.	Planned production
D.	Discontinuous production
Answer» C. Planned production

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

For a classical (Wilson) model of determining economic order quantity (EOQ), the carrying and ordering costs are Cr and Co, respectively. For an annual demand D, the minimum yearly total inventory cost is

Actual observed time for an operation time was 1 min/piece. If the performance rating of the operator was 120 and a 5% personal time is to be provided, the standard time in min/piece is

Among the effects of design specifications on costs, which one of the following is the most significant that influences the producibility of end product?

In an MRP system, component demand is:

Assignment of work to manpower and machinery is known as

Life reliability of product is decided by

All of the following are considered non-productive activities relating to equipment excepts

In order to indicate the sequence of events and movements of men, material, etc., while work is being accomplished, the recording technique used is :

Pre-planning stage in production planning and control includes which of the following activities?

In the Method study, the symbol is used for:

In case of batch production the preferred layout will be

In computing Wilson’s economic lot size for an item, by mistake, the demand rate estimate used was 40% higher than the true demand rate. Due to this error in the lot size computation, the total cost of set-ups plus inventory holding per unit time would rise above the true optimum by approximately

Match the following:P) Process layouti) ship building, aircrafts manufactureQ) Product layoutii) for different types and different sizes of itemsR) Fixed position layoutiii) large varietyS) Combination layoutiv) large quantity

A process layout is generally suggested for