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- Question 1 of 20
The following remarks pertain to the properties of gases and vapors :
1.The equation of state is not by itself sufficient for the calculation of properties such as u, h and s.
2.Throttling process is an adiabatic steady flow process.
3.Increase in entropy in wet region is directly proportional to the increase in enthalpy.
Which of these remarks are correct?CorrectIncorrect
- Question 2 of 20
An ideal gas at 27 °C is heated at constant pressure till the volume becomes three times.The temperature of the gas will then beCorrectIncorrect
- Question 3 of 20
A gas turbine operating on Brayton cycle has the maximum temperature of 1200 K and the minimum temperature of 300 K. The cycle efficiency for the maximum work capacity will beCorrectIncorrect
- Question 4 of 20
No substance can exist in the liquid phase in stable equilibriumCorrectIncorrect
- Question 5 of 20
The COP of a refrigerator working on a reversed Carnot cycle is S.The ratio of the highest absolute temperature to the lowest absolute
temperature would beCorrectIncorrect
- Question 6 of 20
This reversible cycle consists of constant volume heat addition,reversible adiabatic expansion and constant pressure heat rejectionCorrectIncorrect
- Question 7 of 20
An ideal vapour compression refrigerator operates between a condenser pressure pl and an evaporator pressure P2. Which of the following changes would increase its COP?CorrectIncorrect
- Question 8 of 20
An IC engine has a bore and stroke each equal to 2 units. The total area to calculate heat loss from the engine can be taken asCorrectIncorrect
- Question 9 of 20
In a petrol engine, the tendency for detonation increases withCorrectIncorrect
- Question 10 of 20
Consider the following statements
1.Diesel fuels are compared using an ignition delay criterion.
2.Cetane number is equal to the percentage of cetane plus 15% of the percentage of heptamethyl nonane in the fuel.
3.Cetane number of alpha-methyl naphthalene is assigned the value of 15.
Which of these statements are correct?CorrectIncorrect
- Question 11 of 20
A satellite floats in deep space with very high velocity.It will continuously lose heat byCorrectIncorrect
- Question 12 of 20
A furnace has a 20cm thick wall with thermal conductivity 0.8 W/m-K. For the same heat loss from the furnace, what will be the thickness of the wall if the thermal conductivity of the material is 0.16 W/m-K?CorrectIncorrect
- Question 13 of 20
A furnace wall is 10 cm thick and has a thermal conductivity of 0.1kW / m-K. Inner temperature is maintained at 525 °C, while the surrounding temperature outside the furnace is 25 °C. If the surface area of the furnace is 20 m 2 , the heat flux through the wall isCorrectIncorrect
- Question 14 of 20
In unsteady state heat conduction for bodies with negligible temperature gradients, the time temperature variation curve isCorrectIncorrect
- Question 15 of 20
For quick response of a thermocouple to observe varying temperature of fluidsCorrectIncorrect
- Question 16 of 20
A fin will be necessary and effective only when where k = thermal conductivity of fin material, h = convective heat transfer coefficient between the fin surface and environment temperatureCorrectIncorrect
- Question 17 of 20
Which one of the following statements is correct?CorrectIncorrect
- Question 18 of 20
In a heat exchanger, the hot gases enter with a temperature of 150 °C and leave at 75 °C. The cold fluid enters at 25 °C and leaves at 125 °C. The capacity ratio of the exchanger isCorrectIncorrect
- Question 19 of 20
What does NTU indicate?CorrectIncorrect
- Question 20 of 20
When is a transient heat transfer problem considered as a lump capacity problem?CorrectIncorrect
Leaderboard: IES Mechanical 2
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