Birla Institute of Technology (BIT Mesra) 2007 MECHANICAL TECHNOLOGY ( ENGG ZC241 ) - Question Paper

Birla Institute of Technology & Science, Pilani

Distance Learning Programmes Division

Second Semester 2006-2007



Mid-Semester Test

(EC-1 Regular)



Course No. : ENGG ZC241

Course Title : MECHANICAL TECHNOLOGY

No. of Pages = 2

No. of ques. = eight
Nature of examination : Closed Book

Weightage : 40%

Duration : two Hours

Date of examination : 04/02/2007 (AN)

Note:

1. Please follow all the Instructions to Candidates provided on the cover page of the ans book.

2. All parts of a ques. should be answered consecutively. every ans should begin from a fresh page.

3. Mobile phones and computers of any type should not be brought inside the exam hall.

4. Use of any unfair means will outcome in severe disciplinary action.



Q.1. State the 1st legal regulations of Thermodynamics. Also state its limitations. [5]



Q.2. State the 2nd legal regulations of Thermodynamics. [5]



Q.3. Draw and discuss the various stages of an Internal Combustion four-stroke petrol engine. What is Carnot cycle? discuss with diagram. [5]



Q.4. How many kinds of fuels are there? discuss with examples. [5]



Q.5. discuss HCV and LCV of a fuel. [5]



obtain out the HCV and LCV of the fuel whose contents are as follows:

C = 40%

H = 6%

S = 2%

and remaining incombustible fuel.



Q.6. What is he minimum air needed for the combustion of one Kg of the fuel whose composition is as follows: [5]



C = 40%

H = 6%

S = 2%

O = 1%



and the remaining incombustible mass.



Q.7 (a) What is work? What is the unit of work?

Q.7 (b) What is energy? What is the unit of energy?

Q.7 (c) What is the work done by a person in pushing a box weighing 10 Kgs for 5m? g=9.8m/s2

Q.7 (d) What is the Kinetic energy of the ball thrown by a bowler at 5m/s velocity at the batsman? Weight of the ball is 0.5kg.

Q.7 (e) A learner lifts a book weighing 0.65 Kg from the ground on top of a table 5m high. What is the work done by the student? g=9.8m/s2 [5]

Q.8. The subsequent data were found during the testing of a 4-stroke diesel engine: [5]

Bore = 95 mm

Stroke = 150 mm

Engine Speed = 300 rpm

Load on Brake drum = 150 N

Spring Balance studying =15 N

Brake drum Diameter = 400 mm

Area of indicator diagram = 400mm2

Length of the indicator diagram = 60 mm

Spring constant = one bar/mm

Specific fuel consumption = 0.3 kg/KWhr

Calorific value of fuel = 40,000 KJ/Kg



obtain the mechanical brake thermal and indicated thermal efficiencies.

Earning:   Approval pending.