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ISRO ME 2019 Thermodynamics Booster Quiz -5

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Question 1

A single cylinder engine running at 2500 rpm develops a torque of 12 N-m. The indicated power of the engine is 3.5 kW. Loss due to friction power as the percentage of indicated power is _________%.

Question 2

In an isentropic flow of air (k=1.4) the stagnation temperature is 600 K. If the temperature is 400 K at a section, then the Mach number of the flow will be?

Question 3

An ideal reheat Rankine cycle operates between the pressure limits of 10 kPa and 8 MPa, with reheat being done at 4 MPa. The temperature of steam at the inlets of both turbines is 500 °C and the enthalpy of steam is 3185 kJ/kg at the exit of the high pressure turbine and 2247 kJ/kg at the exit of low pressure turbine. The enthalpy of water at the exit from the pump is 191 kJ/kg. Use the following table for relevant data.

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Disregarding the pump work, the cycle efficiency (in percentage) is

Question 4

In a certain ideal refrigeration cycle, the COP of the refrigerator is 3. The cycle under ideal conditions running as heat engine will have efficiency equals to

Question 5

 

From the above cycle diagram depicting a VCRS cycle, deduce the coordinate system used in this figure(1 mark)

Question 6

If volume of moist air with 40% relative humidity is isothermally reduced to half of its original volume than relative humidity will be

Question 7

The volume and temperature of air (assumed to be an ideal gas) in a closed vessel is 2.87 m3 and 300K, respectively. The gauge pressure indicated by a manometer fitted to the wall of the vessel is 0.5bar. If the gas constant of air is R=287 K/kg. K and the atmospheric pressure is 1 bar, the mass of air (in kg) in the vessel is

Question 8

Estimate the change in internal energy of this control mass of a tank containing a fluid is stirred by a paddle wheel. The work input to the paddle wheel is 5050 kJ. The heat transfer from the tank is 1600 kJ. Consider the tank and the fluid inside a control surface.

Question 9

Which of the following is correct about a dead state?

Question 10

According to second law of thermodynamics, the entropy change of the system for any process can be
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Jul 28ESE & GATE ME