Previous Years GATE MCQ’s on I.C Engines 2005-2011

Solved GATE Questions on Internal Combustion Engine

 

Common Data for Questions 1,2:

In two air standard cycles-one operating on the Otto and the other on the Brayton cycle-air is isentropic compressed from 300 to 450 K. Heat is added to raise the temperature to 600 K in the Otto cycle and to 550 K in theBrayton cycle.

Question 1. If  are the coefficient of Otto cycle and Brayton cycles then,

(A) 

(B) 

(C) 

(D) it is not possible to calculate efficiencies unless the temperature after the expansion is given

GATE-ME-2005

Hint

Question 2. If  and  are work outputs per unit mass, then

(A) 

(B) 

(C) 

(D) It is not possible to calculate the work outputs unless the temperature after the expansion is given

GATE-ME-2005

Hint

Question 3. Group I shows different heat addition processes in power cycles. Likewise, Group II shows different removal processes. Group III lists power cycles. Match items from Group I, II and III.

(A) P-S-5, R-U-3, P-S-1, Q-T-2,

(B) P-S-1, R-U-3, P-S-4, P-T-2

(C) R-T-3, P-S-1, P-T-4, Q-S-5

(D) P-T-4, R-S-3,P-S-1, P-S-5

GATE-ME-2006

Hint

Question 4. The stroke and bore of a four stroke spark ignition engine are 250 mm and 200 mm respectively. The clearance volume is 0.001 . If the specific heat ratio , the air standard cycle efficiency of the engine is

(A) 46.40 %

(B) 56.10 %

(C) 58.20 %

(D) 62.80 %

GATE-ME-2007

Hint

Question 5. Which one of the following is Not a necessary assumption for the air standard 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-ME-2008

Hint

Question 6. In air standard Otto-cycle, the compression ratio is 10. The condition at the beginning of the compression process is 100 kPa and 27. Heat added at constant volume is 1500 KJ/Kg, while 700 kJ/kg of heat is rejected during the other constant volume process in the cycle. Specific gas constant for air =0.287 kJ/kg K. the mean effective pressure (In kPa) of the cycle is

(A) 103

(B) 310

(C) 515

(D) 1032

GATE-ME-2009

Hint

Question 7. A turbo-charged four stroke direct injection diesel engine has a displacement volume of 0.0259  (25.9 litres). The engine has an output of 950 kW at 2200 rpm. The mean effective pressure in (MPa) is close to

(A) 2

(B) 1

(C) 0.2

(D) 0.1

GATE-ME-2010

Hint

Question 8. The crank radius of a single-cylinder I.C engine is 60 mm and the diameter of the cylinder is 80 mm. The swept volume of the cylinder in  is

(A) 48

(B) 96

(C) 302

(D) 603

GATE-ME-2011

Hint

Answer Keys