MAE 277 Test 2

What is the strain of a 6-m long wire with a diameter of 1.5 mm that stretches by 3 mm when a load is applied?

5x10^-4

Fluid flowing down a drainage pipe with a constant diameter attains an average fluid velocity of 3 m/s. What is the maximum velocity reached by any part of the fluid?

6 m/s

______ is the upward force on an object that is immersed in a fluid, even if the object and fluid are stationary.

Buoyancy

When a stationary ship is floating in water, what two forces are balanced?

Buoyancy and Weight

A loading situation where an attachment is stressed in shear across two loaded planes simultaneously is known as __.

Double Shear loading

Relative motion between a fluid and an object creates what kind of force acting parallel to the direction of the fluid flow?

Drag

If a fluid flows faster as it passes through a narrow horizontal section of a tube, according to Bernoulli's principle, the pressure will _____.

Drop

Which of these statements correctly describes Hooke's Law?

Extension is directly proportional to force in the elastic region.

Brittle metals, unlike ductile metals, exhibit a considerably large plastic deformation before sudden failure.

False

Having an ultimate strength greater than that of the applied stress will prevent yielding.

False

In fluid dynamics, turbulent flow is generally characterized by smooth fluid movement and a Reynolds number below 2000.

False

Which point/limit is the odd one out in the following list?

Fracture point

Drag force is calculated by finding one half of the coefficient of drag multiplied by the fluid density, ______ , and velocity squared.

Frontal area

Which law relates flow rate with viscosity, pipe length, and pressure difference?

Poiseuille's Law

What parameter determines the behavior of viscous flow patterns?

Reynolds number

Which of the following parameters is not dimensionless?

Rod stiffness

What do all these parameters have in common: Mach number, Reynolds number, coefficient of drag, and coefficient of lift?

They are dimensionless

The measure of a fluid's resistance to flow is known as

Viscosity

A(n) __ is an engineered material made from two or more constituent metals which do not remain separate and distinct on a macroscopic level.

alloy

A rod which undergoes plastic deformation will __.

become permanently deformed.

Which of the following quantities can be measured in Poise?

iv only (viscosity)

The yield point in a stress-strain graph of a wire represents

the point when the wire starts to undergo plastic deformation.