Test: Measurement of Pressure, Simple & Differential Manometers - Mechanical Engineering MCQ

Explanation: Pressure at centre of pipe + Pressure at depth 8 cm in left limb = Pressure at depth 22 cm in right limb
P = 13600×9.81×0.22 – 850×9.81×.08
= 2.86 N/cm².

Explanation: Pressure = a/A height × (density of mercury × 9.81-density of fluid × 9.81)+ height in right limb × density of mercury × 9.81 – height in left limb × density of fluid × 9.81
= 5.21 N/cm²
{ Here a/A = 1/ 250}.

Explanation: Total pressure at the datum line in limb A = Total pressure at the datum line in limb B\
0.5*9.81*10000 + 5*9.81*1500 + h*9.81*13600 = 1.2*9.81*10000 + (h+2)*9.81*850
After solving,
h=12.7 cm.

Explanation: Total pressure at the datum line in limb A = Total pressure at the datum line in limb B
Pressure difference between A and B = -0.4*9.81*1000 + 0.2*9.81*750 + 0.4*9.81*1000
= 1471 N/m².

Explanation: In the inverted U-tube Differential manometer, specific gravity of manometric fluid used is less than relative to the fluid flowing in the pipes as the manonmetric fluid is at the top.

Explanation: Single column manometer directly gives the pressure by measuring the height in the other limb and due to large cross sectional area of the reservoir, for any variation in pressure, the change can be neglected.

Explanation: Manometers are the pressure measuring devices which use the principle of pressure due to static fluid (i.e the column height) to measure the pressure difference.

Explanation: The distance moved by liquid will be more in Inclined Single column manometer due to its inclination.

Explanation: Differential manometer gives the pressure difference between the fluid flowing in two pipes with respect to each other.

Explanation: Inverted U-tube Differential Manometer has lighter manometric fluid, Hence it is used for measuring the low pressure difference.