0000EST120121901

PART 11: BASIC MECHANICAL ENGINEERING

(2019 Scheme)
Max. Marks: 50 Duration:90 min
PARTA
Answer all questions, each carries 4 marks.
12 Why petrol engines are called as SI engines and diesel engines are called as (4)

CI engines?

13 What is meant by scavenging and how is it achieved in a two stroke (4)
engine?
14 Describe any four desirable properties of refrigerants. (4)
15 Compare conventional machine tools and CNC machines. (4)
16 Describe the working of a cluster rolling mill giving a sketch. (4)
PART ‏تا‎
‎Answer one full question from each module, each question carries 10 marks
Module-IV
17 Explain the air standard Diesel cycle with P-V and T-S diagrams. Derive the (10)
expression for its efficiency.
OR
18 a) Explain the CRDI system in automobiles. (5)

b) A Carnot engine, working between 650 K and 310 K, produces 150 kJ of (5)
work. Find thermal efficiency and heat added during the process.

Module-V
19 a) A centrifugal pump discharges water at a rate of 200 litres/minute against a (3)

head of 16 m when running at 300 rpm. Calculate the power required to run

the pump if the overall efficiency of the pump is 50 %.

b) Explain the working of a single plate clutch with neat sketch. (7)
OR
20 a) Explain the split air conditioner and its working. (4)
b) With the help of a neat sketch explain the working of a reciprocating pump. (6)
Module-VI
21 What is casting? With the help of a neat sketch explain the process of sand (10)

mould casting.

OR
22 Give the block diagram of a lathe, indicate the principal parts and list out the (10)

important operations performed on a lathe.

Page 2 of 2