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# Multiple choice question for engineering

## Set 1 1-10. The above given psychrometric chart has been marked with several points from 1-9. Each point represent some specific point or curve or a line.
1. Point 1 represents?
a) % Relative humidity curve
b) 100% Relative humidity
c) Wet bulb line
d) None of the mentioned

Answer: a [Reason:] point 1 represents the % Relative humidity curve.

2. Point 2 represents?
a) Specific humid volume
b) Specific enthalpy values
c) Adiabatic cooling line
d) Relative humidity curve

Answer: c [Reason:] Point 2 represents the Adiabatic cooling line.

3. Point 3 represents?
a) Specific humid volume
b) Specific enthalpy values
c) Adiabatic cooling line
d) Relative humidity curve

Answer: b [Reason:] Point 3 represents the Specific enthalpy values.

4. Point 4 represents?
a) Specific humid volume
b) Specific enthalpy values
c) Adiabatic cooling line
d) Relative humidity curve

Answer: a [Reason:] Point 4 represents the Specific humid volume.

5. Point 5 represents?
a) Dew point temperature
b) Dry bulb temperature
c) Wet bulb temperature
d) None of the mentioned

Answer: b [Reason:] Point 5 represents the dry bulb temperature.

6. Point 6 represents?
a) Dew point temperature
b) Dry bulb temperature
c) Wet bulb temperature
d) None of the mentioned

Answer: c [Reason:] Point 6 represents the wet bulb temperature.

7. Point 7 represents?
a) Dew point temperature
b) Dry bulb temperature
c) Wet bulb temperature
d) None of the mentioned

Answer: a [Reason:] Point 7 represents the dew point temperature.

8. Point 8 represents?
a) % Relative humidity curve
b) 100% Relative humidity
c) Wet bulb line
d) None of the mentioned

Answer: b [Reason:] Point 8 represents 100% Relative humidity.

9. Point 9 represents?
a) Dry point
b) Wet point
c) Dew point
d) None of the mentioned

Answer: c [Reason:] Point 9 represents dew point.

10. Adiabatic cooling lines which are the same (for water vapour only) as the wet bulb or psychrometric line.
The above given statement is
a) True
b) False
c) Depends on wet and dry bulb temperature
d) None of the mentioned

Answer: a [Reason:] Adiabatic cooling lines which are the same (for water vapour only) as the wet bulb or psychrometric line.

## Set 2 1-10. The above given psychrometric chart has been marked with several points from 1-9. Each point represent some specific point or curve or a line.
1. Point 1 represents?
a) % Relative humidity curve
b) 100% Relative humidity
c) Wet bulb line
d) None of the mentioned

Answer: a [Reason:] point 1 represents the % Relative humidity curve.

2. Point 2 represents?
a) Specific humid volume
b) Specific enthalpy values
c) Adiabatic cooling line
d) Relative humidity curve

Answer: c [Reason:] Point 2 represents the Adiabatic cooling line.

3. Point 3 represents?
a) Specific humid volume
b) Specific enthalpy values
c) Adiabatic cooling line
d) Relative humidity curve

Answer: b [Reason:] Point 3 represents the Specific enthalpy values.

4. Point 4 represents?
a) Specific humid volume
b) Specific enthalpy values
c) Adiabatic cooling line
d) Relative humidity curve

Answer: a [Reason:] Point 4 represents the Specific humid volume.

5. Point 5 represents?
a) Dew point temperature
b) Dry bulb temperature
c) Wet bulb temperature
d) None of the mentioned

Answer: b [Reason:] Point 5 represents the dry bulb temperature.

6. Point 6 represents?
a) Dew point temperature
b) Dry bulb temperature
c) Wet bulb temperature
d) None of the mentioned

Answer: c [Reason:] Point 6 represents the wet bulb temperature.

7. Point 7 represents?
a) Dew point temperature
b) Dry bulb temperature
c) Wet bulb temperature
d) None of the mentioned

Answer: a [Reason:] Point 7 represents the dew point temperature.

8. Point 8 represents?
a) % Relative humidity curve
b) 100% Relative humidity
c) Wet bulb line
d) None of the mentioned

Answer: b [Reason:] Point 8 represents 100% Relative humidity.

9. Point 9 represents?
a) Dry point
b) Wet point
c) Dew point
d) None of the mentioned

Answer: c [Reason:] Point 9 represents dew point.

10. Adiabatic cooling lines which are the same (for water vapour only) as the wet bulb or psychrometric line.
The above given statement is
a) True
b) False
c) Depends on wet and dry bulb temperature
d) None of the mentioned

Answer: a [Reason:] Adiabatic cooling lines which are the same (for water vapour only) as the wet bulb or psychrometric line.

## Set 3

1. The set of physical conditions at which the density and other properties of a liquid and vapour become identical, is called
a) Corresponding state
b) Critical state
c) Equation of state
d) None of the mentioned

Answer: b [Reason:] The set of physical conditions at which the density and other properties of a liquid and vapour become identical is known as Critical state.

2. Critical point occurs at
a) Highest temperature and pressure at which gas and liquid can coexist
b) Lowest temperature and pressure at which gas and liquid can coexist
c) Highest temperature and lowest pressure at which gas and liquid can coexist
d) Lowest temperature and highest pressure at which gas and liquid can coexist

Answer: a [Reason:] Critical point occurs at highest temperature and pressure.

3. Material in a state above its critical point is
a) Critical fluid
b) Supercritical fluid
c) Plasma fluid
d) None of the mentioned

Answer: b [Reason:] Material in a state above its critical point is called Supercritical fluid.

4. “Any compound should have the same reduced volume at the same reduced pressure and reduced temperature.” Is known as
a) Law of corresponding states
b) Law of critical state
c) Law of reduced state
d) None of the mentioned

Answer: a [Reason:] Any compound should have the same reduced volume at the same reduced pressure and reduced temperature law of corresponding states.

5. Compressibility factor z is
a) z = PV/RT
b) z = Pv/RT
c) z = PM/RT
d) z = PV/nT
Where: P – Absolute Pressure of the gas
V – Total volume occupied by the gas
n – Number of moles of the gas
T – Absolute temperature
v – Specific molar volume

Answer: b [Reason:] z = Pv/RT.

6. For an ideal gas, the compressibility factor is
a) 0.5
b) 1.0
c) 1.5
d) 2.0

Answer: b [Reason:] z = Pv/RT = 1, for an ideal gas.

7. A parameter that indicates the degree of nonsphericity of a molecule is called
a) Compressibility factor
b) Acentric factor
c) Holburn factor
d) None of the mentioned

Answer: b [Reason:] A parameter that indicates the degree of nonsphericity of a molecule is called Acentric factor.

8. The summation of each of the partial pressure of the component in a system equals to the total pressure. Is
a) Dalton`s law
b) Boyle`s law
c) Charles`s Law
d) None of the mentioned

Answer: a [Reason:] The summation of each of the partial pressure of the component in a system equals to the total pressure is Dalton`s law.

9. For the Van der Waals real gas equation
Statement I: The unit of constant a is atm.L2/mole2
Statement II: The unit of constant b is L
a) Both statements are false
b) Only one can be true at a time
c) Both statement are true
d) None of the mentioned

Answer: b [Reason:] In the first statement, Specific molar volume is used and in second one, total volume. So for the given equation both statement can not be true at a time.

10. Corrected and normalized conditions of temperature, pressure and volume, normalized by their respective critical conditions is called
a) Reduced variables
b) Corresponding variables
c) Standard condition variables
d) None of the mentioned

Answer: a [Reason:] Corrected and normalized conditions of temperature, pressure and volume, normalized by their respective critical conditions is called Reduced variables.

## Set 4

1. Material that leaves a process unit that is the downstream and is returned to the same unit is called
a) Recycle
b) Purge
c) Bypass
d) None of the mentioned

Answer: a [Reason:] Material that leaves a process unit that is the downstream and is returned to the same unit is called Recycle.

2. The stream containing the recycled material is known as
a) Recycle stream
b) Purge stream
c) Bypass stream
d) None of the mentioned

Answer: a [Reason:] The stream containing the recycled material is known as Recycle stream.

3. A recycle system include _________ recycle stream.
a) One or more than
b) Only one
c) Only two
d) None of the mentioned

Answer: a [Reason:] A recycle system include one or more than recycle stream.

4. The feed stream that enters a reactor, usually used in a process with a reactor and recycle, is
a) Process feed
b) Overall process
c) Overall product
d) None of the mentioned

Answer: a [Reason:] The feed stream that enters a reactor, usually used in a process with a reactor and recycle, is process feed.

5. The objective of material balance is to assess the
a) Input-output
b) Conversion efficiency
c) Losses
d) All of the mentioned

Answer: d [Reason:] The objective behind the material balance fulfils all the a, b, c purpose.

6. Recycle product is
a) Input to process
b) Output to process
c) Both output and input
d) All of the mentioned

Answer: a [Reason:] Recycle product is input to process.

7-10. For the given process 7. The correct statement is
a) F + W = G + R
b) F + W = G -R
c) F + R = W + G
d) All of the mentioned

Answer: c [Reason:] For the recycle process, use total balance for first part of the process.

8. The correct statement is
a) G = P + R
b) G = P – R
c) GP = R
d) All of the mentioned

Answer: a [Reason:] For the recycle process, use total balance for second part of the process.

9. The correct statement is
a) F = W – P
b) G = P – R + W
c) F = W + P
d) F = W – P

Answer: d [Reason:] For the recycle process, use total balance for whole process.

10. In the block diagram, the recycle stream is shown by
a) F
b) G
c) R
d) W

Answer: c [Reason:] Material that leaves a process unit that is the downstream and is returned to the same unit is called Recycle.

## Set 5

1. Antoine equation is a relation between
a) Vapour pressure and partial pressure
b) Vapour pressure and Temperature
c) Vapour pressure and absolute pressure
d) None of the mentioned

Answer: b [Reason:] Antoine equation is a relation between Vapour pressure and Temperature.

2. Correct representation of the Antoine equation is
a) ln(p*) = A-B/(C+T)
b) log(p*) = A-B/(C-T)
c) ln(p*) = A+B/(C+T)
d) log(p*) = A-B/(C+T)
Where: p* & T are Vapour pressure and Temperature respectively and A, B & C are constants.

Answer: b [Reason:] ln(p*) = A-B/(C+T) is the correct representation of Antoine equation.

3. The temperature at which the vapour just start to condense at a specified pressure is
a) Critical temperature
b) Boiling point
c) Dew point
d) Triple point

Answer: c [Reason:] The temperature at which the vapour just start to condense at a specified pressure is Dew point.

4. At dew point the partial pressure of the is equal to the partial pressure of the volatile liquid.
The above given statements is
a) Always correct
b) Incorrect
c) Depends on the properties of the liquid
d) None of the mentioned

Answer: b [Reason:] At dew point the partial pressure of the is equal to the vapour pressure of the volatile liquid.

5-7. Assume water in air at 600 mm of Hg at 51 Degree Celsius. (Vapour pressure = 98 mm Hg)
5. What is the pressure of Air?
a) 502 mm Hg
b) 402 mm Hg
c) 302 mm Hg
d) 202 mm Hg

Answer: a [Reason:] Pair = Ptotal – p*.

6. What is the composition of vapour?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367

Answer: a [Reason:] yH2O = 98/600.

7. What is the composition of vapour?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367

Answer: d [Reason:] yAir = 502/600.

8. Dew point of water at standard conditions is?
a) 100 K
b) 273 K
c) 373 K
d) 473 K

Answer: c [Reason:] Dew point of water at standard condition = 100 Degree Celsius.

9-10. Water vapour of 5 KPa at 300 K is saturated with air in a system.
9. What is the mole fraction of air?
a) 0.952
b) 0852
c) 0.259
d) 0.291