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BARC 2019: Thermodynamics Nuclear Quiz-3

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Question 1

Which of the following statement is correct about heat and work interactions.
1) In a process, the work done by the system is equal to or may even exceed the amount of heat supplied to the system.
2) In isothermal process heat supplied is equal to work done on the system.
3) In polytropic process work done by the system is greater than heat supplied to the system.
4) In polytropic process, the polytropic specific heat is negative.

Question 2

Heat is supplied to a system such that, the temperature of system rises by 30 °C. This temperature rise is equivalent to a temperature rise of
(A) 30 K
(B) 54 F
(C) 303 K
(D) 62 K
Which of the above options are correct?

Question 3

An insulated chamber is used to stir 3kg of liquid with specific heat of 3.6KJ/kgK causing temperature rise by 30 °C. Find work done on insulated chamber system.

Question 4

A fluid system undergoes a non-flow frictionless process following the pressure-volume relation as p =+3.5 where p is in bar and V is in. During the process the volume changes from 0.25 to 0.15 and the system rejects 65 kJ of heat. Determine thechange in internal energy.

Question 5

A heat engine takes in energy at the rate of 1400W at a temperature of 1200K. It exhausts heat at the rate of 1000W at 600 K. What is 2nd law efficiency of the heat engine.

Question 6

An adiabatic turbine receives a gas at 5 bar and 1000 °C and discharges at 1.2 bar and 670 °C.The second law efficiency (in percentage ) of the turbine is ____. 
(cp= 1.09 kJ/kgK, cv= 0.815 kJ/kgK and neglect any change in kinetic and potential energy).
Take, To= 300K

Question 7

 A fish freezing plant requires 55 tons of refrigeration. The freezing temperature is – 40 °C while the ambient temperature is 33 °C. If the performance of the plant is 25% of the theoretical reversed Carnot cycle working within the same temperature limits.The power required for refrigeration ( in KW ) is ____.
Given: 1 ton of refrigeration = 225 kJ/min.

Question 8

What will be the heat transfer to the refrigerant and the net heat transfer to the reservoir at 60 °C? If a reversible heat engine operates between two reservoirs at temperatures 800 °C and 60 °C. The engine drives a reversible refrigerator which operates between reservoirs at temperatures of 60 °C and – 20 °C. The heat transfer to the engine is 3000 kJ and the Net Work output of the combined engine refrigerator plant is 490 kJ.

Question 9

Estimate the heat supplied for a rigid cylinder containing 0.005 m3 of nitrogen at 1 bar and 350 K is heated reversibly until the temperature becomes 480 K.
Assume nitrogen to be perfect gas (molecular mass = 28) and
Take γ = 1.4, Universal Gas Constant (R0) = 8.314

Question 10

A Bell Coleman refrigeration cycle works between pressure limits of 1 bar and 5 bar. The adiabatic efficiency of compression is 85% and expansion is 90%. Find out the tonnage capacity when the air flow rate is 1 kg/sec. The ambient temperature is 27ºC and the refrigerator temperature is 0 ºC.
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