estimate and costing question answer

8/13/2019 Estimate and Costing Question Answer

http://slidepdf.com/reader/full/estimate-and-costing-question-answer 1/8

ESTIMATING AND COSTING

For private circulation only @ M.D.J.I.T

M.D.JADHAV INSTITUTE OF TECHNOLOGY

Q.1 Define- A) Estimate B) Estimating C) Costing

Ans.A) Estimate is defined as calculation of probable cost of the project.

The probable cost can be obtained by determining the quantities of construction work and current

rates.

B) Estimating is defined as the process of preparing the estimate. In this process first taking out the

quantities of various items, and then abstracted to get the cost of work.

C) Costing is defined as the determination of actual cost of work before its execution.

Q.2 What is the purpose of estimating and costing?

Ans.

i. To know the approximate cost of work.ii. To know the approximate quantity of the material and labour required.

iii. For technical sanction of the project.

iv. For inviting tenders and arranging contracts.

v. To know the time period required for construction.

vi. To control over expenditure.

Q.3 What are the types of Estimate?

Ans. Mainly there are two types of estimate-

a) Approximate estimateb) Detailed estimate

Types of approximate estimate-

i. Plinth area estimate

ii. Cube rate estimate

iii. Typical bay method

iv. Service unit method

v. Approximate quantity estimate

Types of detailed estimate-

i. Item rate method

ii. Revised estimate

iii. Supplementary estimate

iv. Supplementary and Revised estimate

v. Annual repair estimate.





Q. Explain any one method of approximate estimate in brief.

Ans.

i. Plinth area estimate

This method of estimate is based on plinth area of building. The rate per unit plinth area is

determined by cost of construction of previously constructed building having same specification and

locality. The plinth area of proposed new building is work out and multiply with rate to get the cost.

Rate = Cost of construction/ plinth area

Cost of new building = Plinth area x Rate

ii. Cube rate estimate

This method of estimate is based on cubical content of building. The rate per cubic unit is

determined by cost of construction of previously constructed building having same specification and

locality. Cubical content means volume of proposed new building is work out (L x B x H) and multiply

with rate to get the cost.

Rate = Cost of construction/ volume of existing building.

Cost of new building = Volume of new building x Rate

iii. Service unit method

Each building is constructed to serve some purpose Ex- hostel building, Hospital building. The rate

per service unit is determined by cost of construction of previously constructed building having

same specification and locality. Estimate is per student for hostel, per bed for hospital, per seat for

cinema hall etc.

Rate = Cost of construction/ total no. of service unit in existing building.

Cost of new building = No. of service unit in new building x Rate

iv. Typical bay method

This method of estimate is used for factory building. The estimate of one bay is determined by cost

of construction of previously constructed factory building, using other methods and then estimate

the cost of new building.





Q. Explain the various types of detailed estimate.

Ans.

1) Item rate method-

For the detailed estimate, estimator should know all the items required to complete the project. For

detailed estimate first calculate the exact quantity of various items of work in the measurement sheet. It

requires the study of detailed drawing, specification and rates. For example if you want to prepare the

detailed estimate of new residential building then following items required-

a) Clearing of site

b) Excavation of foundation

c) PCC

d) Footings

e) UCR masonry in plinth for wall foundation

f) BBM in super structureg) RCC columns, slab, beams, lintels etc.

h) Plaster

i) Doors –windows

j) Paint etc.

1. State the requirements of an estimate?

2. Briefly Explain need for estimation?

3. What is work charged establishment

1. List the difference between centre line method and long wall-short wall

method of taking out measurements.

2. What are the rules to be followed while taking the measurements?

3. Mention the units for the following items.

a) flooring b) R.R. Masonry c) Plastering for pointing d) Damp proof

course e) R.C. sunshade (Specified width and thickness)

I. SHORT ANSWER QUESTIONS:

1. List the factors to be consider while preparing detailed estimate and

explain breifly?

2. What are the differences between plinth area method and Unit base method?

3. List the requirements of data preparation.





II ESSAY TYPE QUESTIONS :

1. Prepare the approximate cost of building project (group HOuseing)

i) No.of houses = 150

ii) Plinth area of each dwelling = 600m2

iii) Plinth area rate = Rs. 5,000/-per m2

iv) Cost of water supply & sanitary arrangements @12½%

v) Electrification at 7½% of cost of builing.

vi Cost of roads & Lawns @5%

vii) Cost of P.S.& contingencies @4%

2. Prepare a rough cost estimate of a cinema theatre which accommodate 1700

seats. The cost of construction including all provisions is Rs.6000/- per seat.

3. What are the methods of preparation of approximate estimates and explain

briefly.

Short Answer Questions

1. The internal dimensions of a single roomed building are 5.75x3.75m.

Find the Centre line length of room and parapet. If the wall thickness of

room and parapet are 300mm and 250mm respectively.2. The internal dimensions of a room are 6.25 x 4.25m. find the quantity of

sand filling in basemet. the height and thickness of basement are 750mm

and 450mm respectively the wall thickness of room is 230mm.

Essay Type Questions:

1. The plan and section of one roomed building

Calculate the following quantities by a) central line method b) Long wall

& shortwall method.

i) Earth work excavation .

ii) Cement Concrete for foundation.

iii) Brick in CM 1:6 for footing.

iv) Brick in CM 1:6 for walls excluding openings





2) For a building drawing shown in figure calculate

a) Brickwork in CM(1:6)in foundation footing.

b) 12mm thick plastering the wall surfaces with CM (1:6) for all super

structure walls by central line method.

c) Earth work excavation for the foundation.

3) Repare the detailed estimate for the following items of work for

the building shown in figure.

a) R.C.C. (1:1.5:3) in columns upto ground level only.

b) R.C.C. (1:2:4) in plinth Bleams

c) R.C.C. (1:2:4) in slab.

4) Prepare the detailed estimate for the following items of work for a

building shown .

a) R.R. masonry in CM 1:6 for footings and basement.

b) Brick work in CM 1:6 for super structure.

c) Plastering for ceiling with CM 1:3





5) From the Hipped roof shown in sketch, calculate

a) Length of Hip rafter

b) Ridge Piece





EXERCISE

Short Answer Questions

1. Calculate the Cement contents for the following

a) C.C.(1:5:10) using 40mm H.B.G.Metal for 25m3 work

b) Brick work in CM (1:6) using country Bricks for 15m3 of work if

Essay type Questions

1 Prepare a data sheet and calculate the cost of the items given below:

a) Brick masonry in C.M. (1:6) with country bricks-unit Icum.b)P. C.C.(1:5:10) using 40mm HBG metal unit 1cum.

c) Plaster work of 12mm thick, of 200sqm

d) Flooring work of kota tile of 450mm x 600mm size tile, for room having area 75sqm.

1) Prepare the Bar bending schedule for the beam shown below.

2) Prepare the Bar bending schedule of a simply supported R.C.C. Lintels from

the following specification:

Size of lintel 300mm widex 200mm depth.Main bars in tension zone of Fe

250(grade I) 3 bars of 16mm dia., one bar is cranked through 450 at 170

mm from each end2 No. anchor bars at top 8mm dia.

Two legged stirrups@150mm c/c of 6mm dia. through out.

Clear span of the lintel is 1150mm.

Bearing on either side is 150mm.

estimate and costing question answer

Documents