Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Pressure and Hydrostatic Head-II”.
1. _____________ is used for the measurement of gauge pressure.
a) Manometer
b) Barometer
c) Hydrometer
d) None of the mentioned
Answer: a
Clarification: 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
Clarification:
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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: The pressure at a point in a liquid is proportional to the Density of the liquid and the depth of the point.