IC Engine Question and answers

Topics: Heat engine, Internal combustion engine, Diesel engine Pages: 199 (20268 words) Published: October 8, 2013
S K Mondal’s

IC Engine
GATE, IES & IAS 20 Years Question Answers
Chapter – 1: Gas Power Cycles
Chapter - 2 : SI and CI Engines
Chapter - 3 : Carburetion and Fuel Injection
Chapter - 4 : Fuels
Chapter - 5 : SuperCharging
Chapter - 6 : Jet Propulsion
Chapter - 7 : IC Engine Performances
Chapter - 8 : Engine Cooling
Chapter - 9 : Emission and Control

Er. S K Mondal
IES Officer (Railway), GATE topper, NTPC ET-2003 batch, 12 years teaching experienced, Author of Hydro Power Familiarization (NTPC Ltd)

Page 1 of 77

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Copyright © 2007 S K Mondal

Every effort has been made to see that there are no errors (typographical or otherwise) in the material presented. However, it is still possible that there are a few errors (serious or otherwise). I would be thankful to the readers if they are brought to my attention at the following e-mail address: swapan_mondal_01@yahoo.co.in

S K Mondal

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Gas Power Cycles

S K Mondal’s


Chapter 1

Gas Power Cycles

Previous Years GATE Questions
Carnot cycle

A cyclic heat engine does 50 kJ of work per cycle. If the efficiency of the heat engine is 75%, the heat rejected per cycle is

(a)16 kJ

(b)33 kJ

(c)37 kJ

(d)66 kJ


A Carnot cycle is having an efficiency of 0.75. If the temperature of the high temperature reservoir is 727° C/ what is the temperature of low temperature reservoir?
(a) 23°C
(b) -23°C
(c) 0°C
(d) 250°C


A heat transformer is a device that transfers a part of the heat, supplied to it at an intermediate temperature, to a high temperature reservoir while rejecting the remaining part to a low temperature heat sink. In such a heat transformer, 100 kJ of heat is supplied at 350 K. The maximum amount of heat in kJ that can be transferred to 400 K, when the rest is rejected to that can be transferred to 400 K, when rest is rejected to a heat sink at 300 K is (a) 12.50

(b) 14.29
(c) 33.33
(d) 57.14


A solar energy based heat engine which receives 80 kJ of heat at 100 deg C and rejects 70 kJ of heat to the ambient at 30 deg C is to be designed. The thermal efficiency of the heat engine is
(a) 70%
(b) 1.88%
(c) 12.5%
(d) indeterminate

Stirling cycle

A Stirling cycle and a Carnot cycle operate between 50°C and 350°C. Their efficiencies are ηs and ηc respectively. In this case, which of the following statements is true?
(a) ηs > ηc
(b) ηs = ηc
(c) ηs < ηc
(d) The sign of (ηs - ηc) depends on the working fluids used

Ericsson cycle

A cycle consisting of two reversible isothermal processes and two reversible isobaric processes is known as
(a) Atkinson cycle
(b) Stirling cycle
(c) Brayton cycle
(d) Ericsson cycle


A gas turbine cycle with infinitely large number of stages during compression and expansion leads to
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Gas Power Cycles

S K Mondal’s
(a) Stirling cycle
(c) Ericsson cycle

Chapter 1
(b) Atkinson cycle
(d) Brayton cycle

The constant volume or Otto cycle

Which one of the following is NOT a necessary assumption for the airstandard Otto cycle? (a) All processes are both internally as well as externally reversible. (b) Intake and exhaust processes are constant volume heat rejection processes.

(c) The combustion process is a constant volume heat addition process. (d) The working fluid is an ideal gas with constant specific heats. [GATE-2008]


An engine working on air standard Otto cycle has a cylinder diameter of 10 cm and stroke length of 15 cm. The ratio of specific heats for air is 1.4. If the clearance volume is 196.3 cc and the heat supplied per kg of air per...
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