JNTU

JNTU B.Tech II THERMAL ENGINEERING I Previous Question Paper (December - 2018 - R13)

B.Tech | II | II-II | R13 | December - 2018

Answer PaperPaper Code: 114DUMaximum Marks: 75Time: 3 Hours

Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.

PART-A

1
Answer all questions in this part.
25 marks
a
What is gas power cycle?
2 marks

Answer

A gas power cycle is a thermodynamic cycle in which the working fluid remains in the gaseous state throughout the entire process. These cycles, such as the Otto, Diesel, or Brayton cycles, convert heat energy into mechanical work through a series of compression, heat addition, expansion, and heat rejection processes.
b
Define mixture strength.
3 marks

Answer

Mixture strength is defined as the ratio of the actual fuel-air ratio to the chemically correct (stoichiometric) fuel-air ratio required for complete combustion of the fuel. It indicates whether a mixture is rich (greater than 1) or lean (less than 1).
c
What is the function of a governor in I.C Engines?
2 marks

Answer

Sign in to view the complete answer paper.

d
Define cetane number.
3 marks

Answer

Sign in to view the complete answer paper.

e
Define the terms compression ratio and cutoff ratio.
2 marks

Answer

Sign in to view the complete answer paper.

f
What is scavenging in IC engines?
3 marks

Answer

Sign in to view the complete answer paper.

g
What are the various types of compressors?
2 marks

Answer

Sign in to view the complete answer paper.

h
Define degree of reaction.
3 marks

Answer

Sign in to view the complete answer paper.

i
Define: COP.
2 marks

Answer

Sign in to view the complete answer paper.

j
What is net refrigerating effect of a refrigerant?
3 marks

Answer

Sign in to view the complete answer paper.

PART-B

2
Explain with a neat sketch the working principle of a four stroke engine with a line sketch.
10 marks

Answer

Sign in to view the complete answer paper.

OR
3
What is the need of a cooling system in an automobile engine? Explain the general type of cooling system used in four wheeled vehicles.
10 marks

Answer

Sign in to view the complete answer paper.

4
What do you mean by pre ignition? How can it be detected?
10 marks

Answer

Sign in to view the complete answer paper.

OR
5
What is meant by ignition delay? Explain the causes of knock in C.I. Engines.
10 marks

Answer

Sign in to view the complete answer paper.

6
Explain the method used for the measurement of indicated power of multi cylinder engine.
10 marks

Answer

Sign in to view the complete answer paper.

OR
7
Find out the expression for the work saved per kg of air in a three stage compressor, if the perfect inter cooling is used during the compression process.
10 marks

Answer

Sign in to view the complete answer paper.

8
Explain the working of Roots blower with a line diagram and find the expression for its efficiency.
10 marks

Answer

Sign in to view the complete answer paper.

OR
9
Explain with a line sketch the working principle of centrifugal compressor.
10 marks

Answer

Sign in to view the complete answer paper.

10
Explain the construction and working of vapour absorption refrigeration system.
10 marks

Answer

Sign in to view the complete answer paper.

OR
11
A simple saturation refrigeration cycle developing 15 tons of refrigeration using R12 operates with a condensing temperature of 35°C and an evaporator temperature of -6°C. Calculate: (a) The refrigerating effect, (b) Refrigerant flow rate (c) The power required to drive the compressor, (d) COP.
10 marks

Answer

Sign in to view the complete answer paper.

About this paper

This page contains the solved question paper with answers of THERMAL ENGINEERING I from JNTU for B.Tech ME II II-II, December - 2018, R13.

For the question paper without answers, switch to the Question Paper tab.

Other papers in THERMAL ENGINEERING I

Loading Question Papers

Fetching data from database...