B.Tech-ELECTRONICS AND COMMUNICATIONS 2nd Sem BASICS OF MECHANICAL ENGINEERING(Maharashi Dayanand University (MDU), Rohtak-2010)

NOTE: attempt 5 questions in all , selecting one question from each section . question no.1 is compulsary . all questions carry equal marks.

1. (a) Explain working principal of drilling machine.
(b) Define internal energy and enthalpy.
(c) Define refrigeration and air conditioning .
(d) Why francis turbine is called mixed flow turbine.
(e) Explain belt drive.
(f) What is poison's ratio?
(g) Explain 4 advantages of NC machine.
(h) What is zeroth law of thermodynamics
(i) Why we use psycheometric charts?
(j) What is the difference between spur and helical gears? 2*10=20

SECTION A

2. (a) Explain different types of chips in mettal cutting? 10
(b) Define 1, 2 and 3rd law of thermodynamics. 10

3. (a) What is throttling calorimeter? 10
(b) Explain 5 operations of lathe machine. 10

SECTION B

4. (a) Explain simle refrigeration vapour compression cycle. 15
(b) Define human comfort. 5

5. (a) Derive an expression for specific speed of turbine. 10
(b) Explain reciprocating water pumps. 10


SECTION C

6. (a) Explain with neat diagram , multiple clutch. 15
(b) Define different types of gear. 5

7. Explain elastic constants and their relationship. 20


SECTION C

8. Explain NC machine in detail. 20
9. Define manufacturing system and compare NC and CNC machines. 20

Earning:  ₹ 4.00/-