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ISRO ME 2019: Thermodynamics Booster Quiz -1

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Question 1

For a reversible adiabatic (isentropic process), the change in entropy is

Question 2

If two reversible heat engines are working in series, such that heat source of first engine is at 1300 K and the efficiencies of both engines are same, then the temperature of intermediate reservoir is ______ K.
[Take Ambient temperature = 300 K]

Question 3

In a steady flow apparatus, 125 KJ/kg of work is done by the fluid. The inlet is 30 m above the datum and discharge outlet is on datum. The heat loss between inlet and discharge is 10 KJ/kg of fluid. The fig. shows the value of different properties at inlet and outlet. The change in internal energy (in KJ/kg) is

Question 4

If n is polytropic index , r is expansion ratio , the correct relation for work done during polytropic expansion process is given by

Question 5

A new temperature scale in degrees N is to be defined. The boiling and freezing on this scale are 400 °N and 100 °N respectively. What will be the reading on new scale corresponding to 80 °C?

Question 6

The humidity ratio of atmospheric air at 27 °C dry bulb temperature and 760 mm of Hg is 0.015 kg/kg of dry air. The vapour density (in kg/m3 of dry air) is

Question 7

A carnot refrigerator operates between the thermal reservoirs at -250C and 350C. If the capacity of the unit s 5 tons of refrigeration, determine the power consumed by the refrigerator  ________(in kW).

Question 8

Which one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency and reduces the moisture content of the steam at the turbine outlet?

Question 9

For an engine operating on diesel cycle, if frictional power loss is 20% of the indicated power. Find mechanical efficiency (%) ________.

Question 10

Determine final pressure in vessels after the valve is opened to attain equilibrium for two cylindrical vessels of 3.5 m3 each are inter connected through a pipe with valve in-between. Initially valve is closed and one vessel has 25 kg air while 5 kg of air is there in second vessel. Assuming the system to be at 27 ºC temperature initially and perfectly insulated, take R = 287 J/kg K for air.
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Jun 8ESE & GATE ME