***************
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING – SEMESTER – EXAMINATION – Summer 2015
Subject Code: 3351905 Date:19/05/2014
Subject Name: Estimating Costing and Contracting
Time: 2:30 pm to 5:00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable & Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
***************
Q.1 Answer any seven out of ten. 14
1. Define estimating.
2. Write equation of finding depreciation by straight line method.
3. List the elements of cost in gas welding.
4. Define Breakeven Point.
5. Explain any two forging operations.
6. Give the definition of fixed cost and variable cost.
7. Give the definition of budget.
8. List different types of tenders.
9. Write down the equation for finding overhead cost as per unit rate method.
10. Explain scale loss in forging.
Q.2 (a) Explain effect on Breakeven Point while increasing the fixed cost. 03
OR
(a) Write the assumptions made in construction of Breakeven chart. 03
(b) Derive an equation for Breakeven Point analytically, 03
OR
(b) The fixed cost of an industry is Rs. 50000 and its production capacity is 1000 units per month if each product is sold at Rs. 600, variable cost per product is Rs. 350, find Breakeven number. 03
(c) Write down factors affecting arc welding cost. 04
OR
(c) Estimate the time required for making an open tank of size 25 cm x 25 cm x 25 cm by gas welding, welding is to be done on inner side only. Assuming fatigue allowance is to be 10%, welding speed is 12 minute per meter of welding for 3 mm thick plate. 04
(d) Define the following terms. 1. Approach 2. Overhead travel 3. Feed 4. Cutting speed. 04
OR
(d) Estimate the milling time to prepare a square prism from 90 mm long and 40 mm diameter cylinder. Take feed of 25 mm per minute and set up and indexing time assume 15 minute. 04
Q.3 (a) Write a short note on different types of weight in forging. 03
OR
(a) Write the procedure for finding direct material cost in foundry. 03
(b) Explain any two pattern allowances. 03
OR
(b) Explain any two types of forging in details. 03
(c) A square bar of 2 cm side and 25 cm length is to be converted by hand forging in to a bar of hexagonal section having each sides = 1 cm, calculate the length of hexagonal bar produced. Consider scale loss to be 7% of total volume. 04
OR
(c) A round bar of 25 mm diameter and 500 mm length is being converted in to a square bar of 25 mm sides by forging. Considering 5% scale loss only Estimate the length of square bar formed.04
(d) Calculate the cost of C. I. pulley of 1200 cm3using material cost = Rs. 10 per Kg, wages paid to the worker = 50 per day, density of C. I. = 8 gm per cm3, overhead charges = 20% of material cost, melting charges = 20% of material cost, number of mould prepared = 25 /day / molder. 04
OR
(d) Find the cost of C. I. pulley of 1000 cm3 .Take cost of cast iron = 25 Rs. / Kg rate of molder = Rs.150/day, over head charges = 10% of material cost, total number of moulds made = 30 / day / molder, density of casting = 7.2 gm / cm3, molding charges = 15% of material cost. 04
Q.4 (a) A 15 cm long M.S. bar is to be turned from 4cm dia. In a single cut to 3.8 cm dia. For first 5 cm length and to 3.4 cm for next 10 cm length. If cutting speed is 45 m / min and feed is 0.02 cm / rev, and required setting and mounting time of job in three jaw chuck is 45 sec, estimate the total time required for turning. 07
OR
(a) Estimate the time required to cut 6 threads per cm on a M. S. bar 20 mm diameter for a length of 10 mm. Take cutting speed is 10 meter per minute and assume 6 cuts. 07
(b) One ammonia refrigerant ice plant produce 160 kw refrigerating effect. The heat rejection theoretically by evaporator is 1000 KJ / kg. Theoretical compressor input is 185 KJ/kg. Mechanical efficiency of compressor is 85 %.Actual heat absorption in cold chamber is 80 %. If Power cost per unit is Rs. 10 and labor cost is Rs 2000/day and overhead cost = Rs. 5000/day find out ice production rate per kg. Plant is working for 24 hours. 07
Q.5 (a) List various types of budget. Explain any two in detail. 04
(b) Write difference between manual tendering and E – tendering. 04
(c) The market price of a lathe is Rs. 50000.The distributor is given 10 % discount. Selling expenses are equal to factory expenses. If material cost, labor cost and factory over heads are in the ratio of 1:4:2 and material cost is Rs. 4000, find the profit released on the lathe machine. 06
***************
No comments:
Post a Comment