Deck 16: Gas Laws and Properties

Question 1

Which of the following is true for an open heater?

A)it is simple, has low cost and low heat transfer capacity
B)a pump is required at each heater
C)both of the mentioned
D)none of the mentioned

Answer 1

a pump is required at each heater

Question 2

Deaerator is a type of open heater.

Answer 2

True

Question 3

Which of the following is true for a closed heater?

A)it requires a single pump regardless of the number of heaters
B)it is costly
C)both of the mentioned
D)none of the mentioned

Answer 3

both of the mentioned

Question 4

The efficiency gain follows the law of diminishing return with the increase in the number of heaters.

Question 5

Which of the following statement is true?

A)in some cases, an increase in feedwater temperature may reduce the boiler efficiency
B)number of heaters are optimized
C)most often, five points of extraction are used
D)all of the mentioned

Question 6

The corrected gas equation is given by

A)(p+a/(v²))(v+b)=rt
B)(p-a/(v²))(v-b)=rt
C)(p-a/(v²))(v+b)=rt
D)(p+a/(v²))(v-b)=rt

Question 7

Which of the following statement is true about the correction terms?

A)the coefficient a was introduced to account for the existence of mutual attraction between the molecules
B)the term a/(v²) is called the force of cohesion
C)the coefficient b was introduced to account for the volumes of the molecules and is known as co-volume
D)all of the mentioned

Question 8

Compressibility factor Z is given by

A)rt/pv
B)pv/rt
C)(rt/pv)²
D)(pv/rt)²

Question 9

For an ideal gas, Z has the value

A)0
B)2
C)1
D)infinity

Question 10

The magnitude of Z at a particular pressure and temperature indicates the extent of deviation of the gas from the ideal gas behaviour.

Question 11

For the ideal gas equation, what assumptions are made?

A)there is little or no attraction between the molecules of the gas
B)the volume occupied by the molecules is negligibly small compared to the volume of the gas
C)both of the mentioned
D)none of the mentioned

Question 12

When does a real gas obey the ideal gas equation closely?

A)at high pressure and low temperature
B)at low pressure and high temperature
C)at low pressure and temperature
D)at high pressure and temperature

Question 13

The real gases deviate from the ideal gas equation when the pressure increases.

Question 14

Real gases conform more closely with the van der Waals equation of state than the ideal gas equation of state.

Question 15

What is the pressure of H2 with compressibility 0.6, molar volume 5 liter/mole at 27oC?

A)2.9 atm
B)5.4 atm
C)9.6 atm
D)14.5 atm view answer

Question 16

What is the pressure of 80 grams of CH4 with compressibility 5, with 10 liter volume at 27oC?

A)10.5 atm
B)28.9 atm
C)44.2 atm
D)61.5 atm view answer

Question 17

What is the compressibility of neon (molar mass = 20) with density 20 g/liter at 27°C and 100 atm?

A)2.1
B)3.5
C)4
D)6.8

Question 18

90 g glucose is filled in a container at 10 atm, if the volume of container is 2 liter, what is the temperature of glucose (z = 1.5)?

A)25.4°c
B)51.7°c
C)76.9°c
D)103.5°c

Question 19

at 1 atm and 27°C?

A)23.4 liter
B)37.5 liter
C)42.1 liter
D)59.6 liter view answer

Question 20

39 grams of benzene (z = 1.4) is filled in a container of volume 10 liter at 27°C, what is the pressure of container?

A)1.7 atm
B)1.9 atm
C)2.2 atm
D)2.5 atm view answer

Question 21

Which of the following relation is correct?

A)du=tds-pdv
B)dh=tds+vdp
C)dg=vdp-sdt
D)all of the mentioned

Question 22

Maxwell's equations consists of   equations.

A)four
B)three
C)two
D)one

Question 23

The first TdS equation is

A)tds=cv*dt + t(?t/?p)dv
B)tds=cv*dt - t(?p/?t)dv
C)tds=cv*dt + t(?p/?t)dv
D)tds=cv*dt - t(?t/?p)dv

Question 24

The second TdS equation is

A)tds=cp*dt + t(?v/?t)dp
B)tds=cp*dt - t(?v/?t)dp
C)tds=cp*dt + t(?t/?v)dp
D)tds=cp*dt - t(?t/?v)dp