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Reviewer C > Thermo Concepts Ref: Indiabix, ARC > Flashcards

Thermo Concepts Ref: Indiabix, ARC Flashcards

1
Q

Which law is the basis for the manufacture of thermometers?

A

Zeroth Law of Thermodynamics

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2
Q

How many degrees of freedom has each of the following systems?
14. Liquid water in equilibrium with its vapor

A

one

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3
Q

Liquid water in equilibrium with a mixture of water vapor and nitrogen.

A

two

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4
Q

A liquid solution of alcohol in water in equilibrium with its vapor.

A

two

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5
Q

Energy is added to the water as work but is extracted from the water
as heat was performed by

A

joule

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6
Q

These properties depend on the current state of the system and not
on how the system reaches that state.

A

state functions

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7
Q

Which of the following statement is correct?
a. The standard heat of formation of an element is negative.
b. Since △H = △U + △PV and can never be equal to △U.
c. Q and W are state functions.
d. Q + W is a state function.

A

Q + W is a state function.

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8
Q

The amount of heat absorbed when CO2 gas reacts with a solid CaO
to form solid CaCO3 is measured in a bomb calorimeter at constant
volume. The data obtained give a direct measure of

A

△U

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9
Q

For a constant pressure reversible process, the enthalpy (∆H)
change of the system is

A

. ∫CpdT

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10
Q

Cv is given by

A

(∂U/ ∂T)v

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11
Q

Equation which relates pressure, volume, and temperature of a
gas is called

A

Equation of state

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12
Q

The equation, PV = nRT is best obeyed by gases at

A

low pressure and high temperature

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13
Q

Compressibility factor of a gas is

A

unity, if it follows PV = nRT

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14
Q

Cp – Cv = R is valid for

A

ideal gases

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15
Q

For monoatomic gases, Cp / Cv equals

A

1.67

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16
Q

Isobaric process means a constant

A

pressure process

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17
Q

For an isothermal process the internal energy of a gas

A

remains unchanged

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18
Q

In an adiabatic process

A

heat transfer is zero

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19
Q

From PVn = C, when n = 0, the process is

A

isobaric

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20
Q

From PVn = C, the process is isochoric if n equals

A

∞

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21
Q

A solid is transformed into vapor without going through the liquid
phase at

A

a. below triple point c. triple point

22
Q

Determine whether water is compressed liquid, superheated
vapor, saturated liquid, saturated vapor, or a mixture of saturated
liquid and saturated vapor, in each case. If the state is determined
to be a mixture, determine the quality.
(i) At 10 MPa and an entropy of 3.3 kJ/kg-K
(ii) At 320 0C and 5.6 MPa
(iii) With specific volume of 0.10 m3
/kg at 1 MPa
a. subcooled, superheated, mixture (0.50)
b. mixture (0.40), superheated, subcooled
c. superheated, mixture (0.60), subcooled
d. subcooled, mixture (0.30), superheated

A

subcooled, superheated, mixture (0.50)

23
Q

Work output of turbine is __ the work input to the pump

A

greater than

24
Q

The efficiency of Carnot cycle is ___ the efficiency of Rankine

A

greater than

25
Q

The losses in condenser are

A

small

26
Q

Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.

A

ISOTHERMAL

27
Q

Internal energy change of a system over one complete cycle in a cyclic process is

A

Zero

28
Q

Heating of water under atmospheric pressure is an __________ process.

A

Isobaric

29
Q

Van Laar equation deals with the activity co-efficients in

A

binary solutions

30
Q

High __________ is an undesirable property for a good refrigerant.

A

Viscosity

31
Q

Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the

A

low pressure and low temperature

32
Q

Entropy is a measure of the __________ of a system.

A

Disorder

33
Q

A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is

A

Negative

34
Q

Fundamental principle of refrigeration is based on the __________ law of thermodynamics.

A

Second

35
Q

A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?

A

Carnot refrigeration cycle

36
Q

A refrigerator may be termed as a

A

Heat pump

37
Q

Entropy of an ideal gas depends upon its

A

Pressure and temperature

38
Q

Isobaric process means a constant process.

A

Pressure

39
Q

No work is done by the system, when a reaction occurs at constant

A

Volume

40
Q

If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

A

Clayperon-Claussius equation

41
Q

Equilibrium constant decreases as the temperature

A

increases, for an exothermic reaction.

42
Q

Compressibility factor for almost all the gases are approximately same at the same

A

reduced pressure and reduced temperature.

43
Q

Free energy change at equilibrium is

A

Zero

44
Q

The temperature at which both liquid and gas phases are identical, is called the __________ point

A

Critical

45
Q

Any substance above its critical temperature exists as

A

Gas

46
Q

Isentropic process means a constant __________ process.

A

Entropy

47
Q

In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when

A

n=1

48
Q

A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.

A

Subcooled

49
Q

At absolute zero temperature, all substances have the same

A

heat capacity

50
Q

Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be

A

1160 - using PVN/rt
N=58
V= 448 L ~ 0.448 m3
r= 8.314
K= 273.15
P= 101325

Reviewer C (19 decks)

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