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Multiple choice question for engineering

Set 1

1. _____________ is used for the measurement of gauge pressure.
a) Manometer
b) Barometer
c) Hydrometer
d) None of the mentioned

Answer: a [Reason:] Manometer is used for the measurement of gauge pressure.

2. The density of liquid A is 1.6 g cm-3 and its height h(A) = 16.9 cm, then the density of oil B of height h(B) = 30 cm in the U-tube is about

a) 0.90 g/cm3
b) 1.12 g/cm3
c) 2.24 g/cm3
d) 3.54 g/cm3

Answer: a [Reason:] Pressure at point ‘b’ = Atmospheric pressure + ρB ghB Pressure at point ‘a’ = Atmospheric pressure + ρAghA Pressures at point ‘a’ = point ‘b’.

3. In the sketch, the height h is equivalent to 150 kPa and the barometer reading is 100 kPa. What is pressure inside the tank that is attached to the manometer?

a) 250 kPa
b) 150 kPa
c) 100 kPa
d) 50 kPa

Answer: a [Reason:] Pressure inside the tank = atmospheric pressure + pressure due to liquid height h.

4-5. For the given manometer

4. The value of d2 and d3 are 2.5 m and 2 m respectively and densities for liquids 2 and 3 are 1.8 and 1.3 kg/m3 respectively. What is the density of the liquid 1?
Assume P1 = P2
a) 1.48
b) 1.58
c) 1.68
d) 1.67

Answer: b [Reason:] P1 + ρ1d1g = P2 + ρ2d2g + ρ3d3g.

5. Find out the incorrect statement if both the liquids 2 and 3 have same height and density 2.5m and 1.7 g/cm3?
Assume: d1 = d2 + d3
a) Density of all three liquids is equal
b) ρ1d1 = ρ2d2 = ρ3d3.
c) ρ1 = 2ρ2 = 2ρ3
d) All statements are incorrect

Answer: d [Reason:] P1 + ρ1d1g = P2 + ρ2d2g + ρ3d3g.

6. Pressure measured above atmospheric pressure is called
a) Absolute pressure
b) Gauge pressure
c) Static pressure
d) None of the mentioned

Answer: b [Reason:] Pressure measured above atmospheric pressure is called absolute pressure.

7. A force opposite to the force required to support a mass in gravitational field is
a) Pressure
b) Weight
c) Gravitational acceleration
d) None of the mentioned

Answer: b [Reason:] A force opposite to the force required to support a mass in gravitational field is weight.

8. A positive pressure less than atmospheric pressure is
a) Absolute pressure
b) Gauge pressure
c) Static pressure
d) Vacuum

Answer: d [Reason:] A positive pressure less than atmospheric pressure is vacuum.

9. Pressure at a point in the liquid is
a) Same in all directions
b) Greater in the upward direction
c) Grater in the downward direction
d) None of the mentioned

Answer: c [Reason:] Pressure ids proportional to the depth.

10. The pressure at a point in a liquid is proportional to the _______ of the liquid and the depth of the point.
a) Gravitational acceleration
b) Density
c) Force
d) Area

Answer: c [Reason:] The pressure at a point in a liquid is proportional to the Density of the liquid and the depth of the point.

Set 2

1. _____________ is used for the measurement of gauge pressure.
a) Manometer
b) Barometer
c) Hydrometer
d) None of the mentioned

Answer: a [Reason:] Manometer is used for the measurement of gauge pressure.

2. The density of liquid A is 1.6 g cm-3 and its height h(A) = 16.9 cm, then the density of oil B of height h(B) = 30 cm in the U-tube is about

a) 0.90 g/cm3
b) 1.12 g/cm3
c) 2.24 g/cm3
d) 3.54 g/cm3

Answer: a [Reason:] Pressure at point ‘b’ = Atmospheric pressure + ρB ghB Pressure at point ‘a’ = Atmospheric pressure + ρAghA Pressures at point ‘a’ = point ‘b’.

3. In the sketch, the height h is equivalent to 150 kPa and the barometer reading is 100 kPa. What is pressure inside the tank that is attached to the manometer?

a) 250 kPa
b) 150 kPa
c) 100 kPa
d) 50 kPa

Answer: a [Reason:] Pressure inside the tank = atmospheric pressure + pressure due to liquid height h.

4-5. For the given manometer

4. The value of d2 and d3 are 2.5 m and 2 m respectively and densities for liquids 2 and 3 are 1.8 and 1.3 kg/m3 respectively. What is the density of the liquid 1?
Assume P1 = P2
a) 1.48
b) 1.58
c) 1.68
d) 1.67

Answer: b [Reason:] P1 + ρ1d1g = P2 + ρ2d2g + ρ3d3g.

5. Find out the incorrect statement if both the liquids 2 and 3 have same height and density 2.5m and 1.7 g/cm3?
Assume: d1 = d2 + d3
a) Density of all three liquids is equal
b) ρ1d1 = ρ2d2 = ρ3d3.
c) ρ1 = 2ρ2 = 2ρ3
d) All statements are incorrect

Answer: d [Reason:] P1 + ρ1d1g = P2 + ρ2d2g + ρ3d3g.

6. Pressure measured above atmospheric pressure is called
a) Absolute pressure
b) Gauge pressure
c) Static pressure
d) None of the mentioned

Answer: b [Reason:] Pressure measured above atmospheric pressure is called absolute pressure.

7. A force opposite to the force required to support a mass in gravitational field is
a) Pressure
b) Weight
c) Gravitational acceleration
d) None of the mentioned

Answer: b [Reason:] A force opposite to the force required to support a mass in gravitational field is weight.

8. A positive pressure less than atmospheric pressure is
a) Absolute pressure
b) Gauge pressure
c) Static pressure
d) Vacuum

Answer: d [Reason:] A positive pressure less than atmospheric pressure is vacuum.

9. Pressure at a point in the liquid is
a) Same in all directions
b) Greater in the upward direction
c) Grater in the downward direction
d) None of the mentioned

Answer: c [Reason:] Pressure ids proportional to the depth.

10. The pressure at a point in a liquid is proportional to the _______ of the liquid and the depth of the point.
a) Gravitational acceleration
b) Density
c) Force
d) Area

Answer: c [Reason:] The pressure at a point in a liquid is proportional to the Density of the liquid and the depth of the point.

Set 3

1. ________________ is the solution of appropriate process material and energy balances.
a) Flow sheeting
b) Flow processing
c) Flow Solving
d) None of the mentioned

Answer: a [Reason:] Flow sheeting is the solution of appropriate process material and energy balances.

2. Process simulator is the computer code used in ________________
a) Flow sheeting
b) Flow processing
c) Flow Solving
d) None of the mentioned

Answer: a [Reason:] Process simulator is the computer code used in flow sheeting.

3. Calculation of _____________ is the fundamental of flow sheeting codes.
a) Mass balance
b) Mole balance
c) Energy balance
d) None of the mentioned

Answer: a [Reason:] Calculation of mass balance is the fundamental of flow sheeting codes.

4. Which of the following is a feature of process simulator?
a) Equipment sizing functions
b) Import and export data
c) Scheduling of batch operations
d) All of the mentioned

Answer: d [Reason:] All a, b, c are the features of a process simulator.

5. What is the product enthalpy of 1 mole of the product? The feed of a process simulator is 1 mole with enthalpy 2 J/mole, the heat input is 4 J, and the work performed is 5 J.
a) 1 J/mole
b) 2 J/mole
c) 3 J/mole
d) 5 J/mole

Answer: c [Reason:] Energy balance, H = 2 + 4 – 5 = 1 J/mole.

6. What is the product enthalpy of a process simulator if the feed is 15 J, the heat input is 10 J, and the work performed is 5 J?
a) 10 J
b) 15 J
c) 20 J
d) 25 J

Answer: c [Reason:] Energy balance, H = 15 + 10 – 5 = 20 J.

7. The interconnection equations are for a _____________ model.
a) Mixing
b) Splitting
c) Process
d) All of the mentioned

Answer: a [Reason:] Mixing model is for interconnection equations.

8. While solving a process simulation, required balance is?
a) Material balances
b) Equilibrium relations
c) Energy balances
d) All of the mentioned

Answer: d [Reason:] All three are required for solving process simulator.

9. The input mass in a process simulator is X Kg and output mass is Y Kg. Then
a) X = Y
b) X > Y
c) X < Y
d) None of the mentioned

Answer: a [Reason:] Mass balance, product mass = feed mass.

10. The input mass in a process simulator is 2 Kg and output mass is ______ Kg.
a) 1
b) 2
c) 3
d) 4

Answer: b [Reason:] Mass balance, product mass = feed mass.

Set 4

1. A chart showing the humidity versus temperature along with all the other properties of moist air is called
a) Relative humidity chart
b) Psychrometric chart
c) Air vapour phase chart
d) None of the mentioned

Answer: b [Reason:] A chart showing the humidity versus temperature along with all the other properties of moist air is called psychrometric chart.

2. The representation on the humidity chart of the energy balance in which the heat transfer to water from the air is assumed to equal the enthalpy of vaporization of liquid water is Wet Bulb Line.
The above given statement is
a) True
b) False
c) Not defined well
d) None of the mentioned

Answer: a [Reason:] The representation on the humidity chart of the energy balance in which the heat transfer to water from the air is assumed to equal the enthalpy of vaporization of liquid water is Wet Bulb Line.

3. The humidity chart is formally known as the psychrometric chart. The statement is
a) True
b) False
c) Not defined well
d) None of the mentioned

Answer: a [Reason:] The humidity chart is formally known as the psychrometric chart.

4. Psychrometric chart is plotted between the parameters
a) Humidity and temperature
b) Humidity and pressure
c) Humidity and volume of the dry air
d) None of the mentioned

Answer: a [Reason:] Psychrometric chart is plotted between Humidity and temperature.

5. The idea of wet bulb temperature is based on the equilibrium between the rates of energy transfer to the ______ and the evaporation of ______
a) Water and vapour
b) Bulb, water
c) Bulb and vapour
d) None of the mentioned

Answer: b [Reason:] The idea of wet bulb temperature is based on the equilibrium between the rates of energy transfer to the bulb and the evaporation of water.

6. Humidity measurement is done with
a) Thermometer
b) Hygrometer
c) Barometer
d) None of the mentioned

Answer: b [Reason:] Humidity measurement is done with Hygrometer.

7. Absolute humidity is the ______ amount of water vapour that the air could hold at certain temperature.
a) Equal
b) Lowest
c) Greatest
d) None of the mentioned

Answer: c [Reason:] Absolute humidity is the greatest amount of water vapour that the air could hold at certain temperature.

8. For saturated air, relative humidity is
a) 100%
b) 50%
c) 0%
d) None of the mentioned

Answer: a [Reason:] For saturated air, relative humidity is 100%.

9. The degree of saturation is the ratio of the ______ humidity to the _______ humidity at the same __________
a) Actual specific, saturated specific, temperature
b) Saturated specific, actual specific, pressure
c) Actual specific, saturated specific, pressure
d) Saturated specific, actual specific, temperature

Answer: a [Reason:] The degree of saturation is the ratio of the actual specific humidity to the saturated specific humidity at the same temperature.

10. Find out the correct statement
a) The degree of saturation varies between 1 to infinity
b) The degree of saturation varies between 0 to infinity
c) The degree of saturation varies between 0 and 1
d) None of the mentioned

Answer: c [Reason:] The degree of saturation varies between 0 to 1.

Set 5

1. A chart showing the humidity versus temperature along with all the other properties of moist air is called
a) Relative humidity chart
b) Psychrometric chart
c) Air vapour phase chart
d) None of the mentioned

Answer: b [Reason:] A chart showing the humidity versus temperature along with all the other properties of moist air is called psychrometric chart.

2. The representation on the humidity chart of the energy balance in which the heat transfer to water from the air is assumed to equal the enthalpy of vaporization of liquid water is Wet Bulb Line.
The above given statement is
a) True
b) False
c) Not defined well
d) None of the mentioned

Answer: a [Reason:] The representation on the humidity chart of the energy balance in which the heat transfer to water from the air is assumed to equal the enthalpy of vaporization of liquid water is Wet Bulb Line.

3. The humidity chart is formally known as the psychrometric chart. The statement is
a) True
b) False
c) Not defined well
d) None of the mentioned

Answer: a [Reason:] The humidity chart is formally known as the psychrometric chart.

4. Psychrometric chart is plotted between the parameters
a) Humidity and temperature
b) Humidity and pressure
c) Humidity and volume of the dry air
d) None of the mentioned

Answer: a [Reason:] Psychrometric chart is plotted between Humidity and temperature.

5. The idea of wet bulb temperature is based on the equilibrium between the rates of energy transfer to the ______ and the evaporation of ______
a) Water and vapour
b) Bulb, water
c) Bulb and vapour
d) None of the mentioned

Answer: b [Reason:] The idea of wet bulb temperature is based on the equilibrium between the rates of energy transfer to the bulb and the evaporation of water.

6. Humidity measurement is done with
a) Thermometer
b) Hygrometer
c) Barometer
d) None of the mentioned

Answer: b [Reason:] Humidity measurement is done with Hygrometer.

7. Absolute humidity is the ______ amount of water vapour that the air could hold at certain temperature.
a) Equal
b) Lowest
c) Greatest
d) None of the mentioned

Answer: c [Reason:] Absolute humidity is the greatest amount of water vapour that the air could hold at certain temperature.

8. For saturated air, relative humidity is
a) 100%
b) 50%
c) 0%
d) None of the mentioned

Answer: a [Reason:] For saturated air, relative humidity is 100%.

9. The degree of saturation is the ratio of the ______ humidity to the _______ humidity at the same __________
a) Actual specific, saturated specific, temperature
b) Saturated specific, actual specific, pressure
c) Actual specific, saturated specific, pressure
d) Saturated specific, actual specific, temperature