SSC JE Mechanical Engineering 25th Jan 2018 Shift-2

Instructions

For the following questions answer them individually

Question 141

What will be the effect on the thermal efficiency of the diesel cycle if the compression ratio is fixed and the cut off ratio is increased?

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Question 142

Which of the following is/are TRUE atcritical point?

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Question 143

Which law governs the process of heat transfer?

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Question 144

Enthalpy is an ....... of a system and its unit is .............

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Question 145

The heat interaction of the system is a function of temperature only Q=30+1t kJ. If the system does a workof 2 kJ/K. What is the increase in Internal energy per degree temperature?

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Question 146

2500 kJ/min heatis supplied to a heat engine at 1200 K. It rejects heat at 1500 kJ/min at 600 K. This type of engine is ............

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Question 147

What happens to entropy whena close system undergoesan irreversible process?

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Question 148

If two engines $$E_1$$ and $$E_2$$ are working in the same temperature ranges. The $$E_1$$, is a reversible engine, whereas $$E_2$$ is an irreversible engine. Which of the following is CORRECT for the efficiency of the engines?

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Question 149

Which of the following values remains constant for saturated liquid and saturated vapour at a constant slope in the Mollier diagram?

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Question 150

Which is the CORRECT mathematical representation of the Kelvin-Planck statement?

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