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GATE 2019: Thermodynamics Quiz 10
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Question 1
The compression ratio of an IC engine is 20 and workdone per cycle is 1000 kJ. If total volume of the cylinder is 1 m3, then the mean effective pressure is ___________ bar.
Question 2
The mean effective pressure of an Otto cycle can be expressed as:
[where,
= Pressure rise during heat addition]
[where,
= Pressure rise during heat addition] Question 3
A test is performed on 4 stroke single cylinder engine gave the following results:
The indicated thermal efficiency is ____________%.
The indicated thermal efficiency is ____________%.
Question 4
A Diesel engine has a compression ratio of 25 and cut-off takes place at 5% of the stroke. Calculate the air-std efficiency. Assume γ = 1.4.
Question 5
Consider the following statements:
In order to prevent detonation in a spark ignition engine, the charge away from the spark plug should have
1). Low temperature
2). Low density
3). Long ignition delay
Which of these statements is/are correct?
In order to prevent detonation in a spark ignition engine, the charge away from the spark plug should have
1). Low temperature
2). Low density
3). Long ignition delay
Which of these statements is/are correct?
Question 6
Match List-I (Gas cycles) with List-ii (Thermodynamic Coordinates) and select the correct answer using the code given below the lists:
List-i
A). Carnot cycle
B). Brayton cycle
C). Ericsson cycle
D). Stirling cycle
List-ii
1). Pressure-Entropy
2). Pressure-Temperature
3). Temperature-Volume
4). Temperature-Entropy
List-i
A). Carnot cycle
B). Brayton cycle
C). Ericsson cycle
D). Stirling cycle
List-ii
1). Pressure-Entropy
2). Pressure-Temperature
3). Temperature-Volume
4). Temperature-Entropy
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