15 questions. Tap an option to check it instantly, then read the solution.
Practice SSC JE and state AE/JE civil engineering exam questions on Measurement of Pressure: piezometers, simple U-tube manometers (positive gauge and vacuum pressures), differential manometers (two-fluid, inverted U-tube, micromanometers), inclined manometers, mercury barometers and altitude variations, Bourdon tube mechanical gauges, Pitot-static tubes for stagnation and static pressure, and unit conversions between Pascals, bars, standard atmospheres, and liquid column heads. Tap an option to check it, then open the comprehensive step-by-step explanation with high-resolution engineering diagrams.
Question 1Easy
The right limb of height h₂ in the simple u tube manometer containing mercury is open to atmosphere, while the left limb of height h₁ is connected to pipe in which a liquid of specific gravity 1 is flowing with uniform speed with h₁ < h₂. This condition gives ______ kind of pressure.
When the pipe pressure forces mercury down in the left limb and up in the right open limb (h₂ > h₁), the pipe pressure exceeds atmospheric pressure, indicating positive gauge pressure.
Question 2Easy
A simple U-tube manometer connected to a pipe in which liquid is flowing with a uniform speed will give ______.
A simple U-tube manometer has one limb open to the atmosphere, so it directly measures pressure relative to atmospheric pressure, which is gauge pressure.
Question 3Easy
Which of the following is NOT an advantage of the manometer?
Having a small operating range is a disadvantage and limitation of a liquid column manometer, not an advantage.
Question 4Easy
A manometer is an instrument used for measuring the pressure acting on a column of fluid, which consists of a U-shaped tube of liquid in which the difference in pressures acting in the two arms of the tube causes the liquid to reach different heights in the two arms. Which of the following is NOT a limitation of the manometer?
Manometers have simple and straightforward construction (consisting merely of bent glass tubing and fluid); therefore, 'difficulty in construction' is NOT a limitation.
Answer: C. difference of pressure between two points
Differential manometers are specifically designed to measure the difference of pressure (Δp = p_A − p_B) between two points.
Question 6Easy
A horizontal pipeline AB of diameter d conveys water, flowing from A to B. The U-tube manometer with mercury as manometric liquid can be used for the measurement of :
Answer: B. difference in the pressure head between two points A and B
For a uniform horizontal pipe (where velocity and elevation are constant), a differential U-tube manometer directly measures the difference in pressure head between points A and B.
Question 7Easy
To measure the static pressure in a pipe, one uses a pressure gauge connected to :
Static pressure in a pipeline is measured by connecting a gauge to a piezometer tapping drilled flush into the pipe wall.
Question 8Hard
At the base of a mountain, a mercury barometer reads 700 mm whereas at the top it reads 500 mm of Mercury. The density of air is 1.23 kg/m³, is assumed constant. Determine the height of the mountain. (Take specific gravity of mercury as 13.6, and the density of water as 1000 kg/m³)
Gauge pressure measures pressure relative to the local atmospheric pressure, so atmospheric pressure is marked as 0 on the scale.
Question 14Medium
A pressure gauge fitted on the side of a tank filled with liquid reads 50 kPa and 100 kPa at height of 5 m and 10 m. What is the approximate density of the liquid (in kg/m³)? (take g = 10)