IDIS 403 - Chapter 2 Questions with Detailed
Verified Answers
What is a hydrodynamic device? Ans: A hydraulic device which uses the kinetic
energy in the liquid to transmit power
Name two ways that create a tendency for a liquid to flow. Ans: Th tendency to cause
flow (or the push) may be supplied by a mechanical pump or by the weight of the fluid
What is a pressure "head"? Ans: Pressure exerted on its container due to internal
energy
Comes from the weight of the fluid above it
How is mercury column supported in a barometer? Ans: When a tube full of mercury
is inverted in a pan of the liquid, the column in the tube will fall only a certain distance
because the atmospheric pressure was supporting the weight of the column with a
perfect vacuum.
What is the formula to convert PSIG to PSIA? Ans: Gauge pressure + 14.7 = Absolute
pressure
What are two ways to measure flow? Ans: Velocity, the average speed of the fluid's
particles past a given point
Average distance the particles travel per unit of time
What happens when a confined liquid is subject to different pressures? Ans: If the
pressure changes at one point, the liquid levels at other points rise only until their
weight is sufficient to makeup the difference in pressure
Pump working pressure is the sum of which individual pressures? Ans: Pressure
required to move the oil mass and overcome friction plus pressure needed to move
the load
Verified Answers
What is a hydrodynamic device? Ans: A hydraulic device which uses the kinetic
energy in the liquid to transmit power
Name two ways that create a tendency for a liquid to flow. Ans: Th tendency to cause
flow (or the push) may be supplied by a mechanical pump or by the weight of the fluid
What is a pressure "head"? Ans: Pressure exerted on its container due to internal
energy
Comes from the weight of the fluid above it
How is mercury column supported in a barometer? Ans: When a tube full of mercury
is inverted in a pan of the liquid, the column in the tube will fall only a certain distance
because the atmospheric pressure was supporting the weight of the column with a
perfect vacuum.
What is the formula to convert PSIG to PSIA? Ans: Gauge pressure + 14.7 = Absolute
pressure
What are two ways to measure flow? Ans: Velocity, the average speed of the fluid's
particles past a given point
Average distance the particles travel per unit of time
What happens when a confined liquid is subject to different pressures? Ans: If the
pressure changes at one point, the liquid levels at other points rise only until their
weight is sufficient to makeup the difference in pressure
Pump working pressure is the sum of which individual pressures? Ans: Pressure
required to move the oil mass and overcome friction plus pressure needed to move
the load
