Time Left - 30:00 mins

GATE 2019: National Champion Quiz-Thermodynamics (App update required to attempt this test)

Attempt now to get your rank among 2875 students!

Question 1

What is the maximum work that can be obtained, if one kg of water at 90 °C is cooled to ambient temperature of 27 °C (Specific heat of water = 4.18 kJ/kg-K).

Question 2

A Carnot refrigerator requires 1.3 kW per tonne of refrigeration to maintain a region at a low temp of -38 °C. The C.O.P. of this device when used as a heat pump:

Question 3

Presence of moisture in a refrigerant affects the working

Question 4

Which one among the following is not the consequence of first law of thermodynamics?

Question 5

A gas expands in a frictionless piston-cylinder arrangement. The expansion process is very slow, and is resisted by an ambient pressure of 100 kPa. During the expansion process, the pressure of the system (gas) remains constant at 300 kPa. The change in volume of the gas is 0.01 m3. The maximum amount of work that could be utilized from the above process is

Question 6

The internal energy of a certain system is a function of temperature alone and is given by formula E = 25 + 0.25 t kJ (where t is the temperature). If this system executes a process for which the work done by it per degree temperature increase is 0.75 kN-m, the heat-interaction per degree temperature increase is _________ kJ.

Question 7

Estimate the entropy(kJ/min-K) produced during heat transfer for a system at 520 K receives 7500 kJ/min from a source at 1100 K. The temperature of atmosphere is 297 K. Assuming that the temperatures of system and source remain constant during heat transfer

Question 8

An amount of 100 kW of heat is transferred through a wall in steady state. One side of the wall is maintained at 127 °C and the other side at 27 °C. The entropy generated (in W/K) due to the heat transfer through the wall is _______

Question 9

An engine working on air standard Otto cycle has a cylinder diameter of 10 cm and stroke length of 15 cm. The ratio of specific heats for air is 1.4. If the clearance volume is 196.3 cc and the heat supplied per kg of air per cycle is 1800 kJ/kg, the work output per cycle per kg of air is

Question 10

In an ideal vapour compression refrigeration cycle, the specific enthalpy of refrigerant (in kJ/kg) at the following states is given as:
Inlet of condenser: 283
Exit of condenser: 116
Exit of evaporator: 232
The COP of this cycle is

Question 11

A steel flask of 0.04 m3 capacity is to be used to store air at 100 bar, 27 °C. The flask is to be protected against excessive pressure by a fusible plug which will melt and allow the air to escape if the temperature rises too high. The temperature at which fusible plug must melt in order to limit the pressure of a full flask to a maximum of 150 bar is ______ ( °C).
[Take air as perfect gas and R = 287 J/kg-K]

Question 12

In the diagram shown, what is the total work done by the gas during the cycle?
  • 2875 attempts
  • 42 upvotes
  • 28 comments
Aug 29ESE & GATE ME