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GATE 2019: Thermodynamics Rapid Quiz-1 (App update required to attempt this test)

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Question 1

Polytropic index n is given by

Question 2

When air expands from initial pressure P1 and volume V1 to final volume 5V1 following the law PVn=C

Question 3

In an adiabatic process 4000 J of work is performed on a system. In the nonadiabatic process by which the system returns to its original state 1000J of heat is added to the system. What is the work done during non-adiabatic process?

Question 4

The unit of power in S.I. units is:

Question 5

During a constant pressure expansion of a gas, 33.3% heat is converted into work while the temperature rises by 20 K. The specific heat of the gas at constant pressure as a proportion of work, W is

Question 6

Which of the following statements are correct for a throttling process?
1) It is an adiabatic steady flow process
2) The enthalpy before and after throttling is same
3) In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity

Question 7

Consider the following conditions for the reversibility of a cycle:
1) The P and T of the working substance must not differ appreciably, from those of the surroundings at any state in the process.
2) All the processes, taking place in the cycle, must be extremely slow.
3) The working parts of the engine must be friction-free.
Which of the following conditions are correct?

Question 8

What will be the temperature (oC) corresponding to the thermometric property of 3.5 on Celsius scale. If at the ice point and steam point the thermometric properties are found to be 2.5 and 8.5 respectively.
A temperature scale of certain thermometer is given by the relation:
t = a ln p + b
Where a and b are constants and p is the thermometric property of the fluid in the thermometer.

Question 9

Evaluate the change in internal energy and the work done for a closed system of constant volume experiences a temperature rise of 30 °C when a certain process occurs. The specific heat at constant volume for the pure substance comprising the system is 1.2 kJ/kg °C and the system contains 2.5 kg of this substance.

Question 10

The given figure shows the variation of force in an elementary system which undergoes a process during which the plunger position
changes from 0 to 3 m. lf the internal energy of the system at the end of the process is 6.5 J higher, then the heat absorbed during the
process is:
force
                                                   displacement

Question 11

A new scale B of temperature is divided in such a way that freezing point of ice is 80o B and boiling point is 320o B. The temperature at which both the Celsius and new temperature scale reading would be same is

Question 12

Air contains 79% N2 and 21% O2 on a molar basis. Methane (CH4 ) is burned with 50% excess air than required stoichiometrically. Assuming complete combustion of methane, the molar percentage of N2 in the products is ________________.
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