Flow Measurement Objective Type Questions and Answers

1. For accurate operation, orifice plate flowmeters require
a) Laminar flow
b) Fully-developed turbulent flow
c) Swirls and eddies in the flow stream
d) Transitional flow
Answer : Fully-developed turbulent flow
2. A flag flapping in the breeze illustrates what type of dynamic fluid effect?
a) Cavitation
b) Vortex shedding
c) Transitional flow
d) Coriolis effect
Answer : Vortex shedding
3. A ∆P transmitter calibrated for a range of 0 to 100 ”H2O measures liquid flow through an orifice plate from 0 to 1200 GPH. Calculate the new calibration range for the transmitter if we desire to decrease the flow measurement range to 0 to 700 GPH, using the same orifice plate.
a) 0 to 34.03” H2O
b) 0 to 76.38” H2O
c) 0 to 171.4” H2O
d) 0 to 293.9” H2O
Answer : 0 to 34.03” H2O
4. Identify which of the following flowmeters inherently measures mass flow rate
a) Thermal
b) Magnetic
c) Flow nozzle
d) Vortex
Answer : Thermal
5. As an incompressible fluid moves through a restriction
a) Velocity decreases and pressure increases
b) Velocity increases and pressure increases
c) Velocity increases and pressure remains the same
d) Velocity increases and pressure decreases
Answer : Velocity increases and pressure decreases
6. Which of the following flow-measuring elements is inherently linear and requires no signal characterization (e.g. sqaure-root extraction) anywhere in the loop?
a) Target
b) Turbine
c) Orifice plate
d) Pitot tube
Answer : Turbine
7. The purpose for providing ample straight-pipe lengths before and after a flowmeter is to
a) Dampen pipe vibrations generated near elbows
b) Stabilize the flow profile within the flowmeter
c) Amplify the coriolis effect for better range
d) Prevent cavitation
Answer : Stabilize the flow profile within the flowmeter
8. Bernoulli’s Equation is a mathematical expression of
a) The ratio of kinetic to viscous forces in a flow stream
b) Friction loss as fluid moves through a rough pipe
c) Potential and kinetic energies in a flow stream
d) Fluid density and compressibility in a restriction
Answer : Potential and kinetic energies in a flow stream
9. A magnetic flowmeter will not properly measure the flow rate of
a) Dirty water
b) Milk
c) Oil
d) Caustic
Answer : Oil
10. As an incompressible fluid moves through a restriction Velocity increases and pressure decreases
a) True
b) False
Answer: True