FCTC FCTC Test Applying Mechanical Reasoning Questions and Answers 5

Question 1

A screw has 20 threads per inch. If you turn it 5 full rotations, how far does it advance into the material?

Accepted Answer

0.25 inches

Answer

Advance = rotations / threads per inch = 5 / 20 = 0.25 inches.

Question 2

Two shafts are connected by a chain and sprocket. The drive sprocket has 15 teeth and the driven sprocket has 45 teeth. The drive shaft turns at 600 RPM. What is the output RPM?

Accepted Answer

200 RPM

Answer

Output RPM = input RPM × (drive teeth / driven teeth) = 600 × (15/45) = 200 RPM.

Question 3

What type of stress acts on a bolt that holds two plates being pulled apart?

Accepted Answer

Tensile stress

Answer

When plates are pulled apart, the bolt is stretched along its length, placing it under tensile stress.

Question 4

A pump impeller spins faster when its motor speed increases. What happens to the fluid pressure it generates?

Accepted Answer

Pressure increases

Answer

Centrifugal pump pressure output increases with impeller speed; doubling the speed roughly quadruples the pressure.

Question 5

A steel rod is heated. Which dimension changes the most proportionally?

Accepted Answer

All dimensions expand proportionally

Answer

Thermal expansion is isotropic in steel, meaning all dimensions expand by the same fractional amount.

FCTC Test Practice Test

FCTC Test Practice Test

FCTC FCTC Test Applying Mechanical Reasoning Questions and Answers 5