Plant Operator Selection System Mechanical Concepts Questions and Answers

Question 1

In the pulley system shown, a single rope is used to lift a 200 lb weight. Assuming the system is frictionless, what is the minimum force (effort) required at point 'E' to lift the weight?

Accepted Answer

50 lbs

Answer

200 lbs

Answer

100 lbs

Answer

400 lbs

Question 2

A technician needs to tighten a bolt with a specific amount of torque. Which of the following actions would be most effective for increasing the applied torque without increasing the applied force?

Accepted Answer

Using a wrench with a longer handle.

Answer

Using a wrench with a shorter handle.

Answer

Applying the force closer to the bolt head.

Answer

Turning the wrench faster.

Question 3

If Gear A makes one complete clockwise revolution, which of the following statements is true about Gear C?

Accepted Answer

Gear C will make less than one revolution in a clockwise direction.

Answer

Gear C will make more than one revolution in a clockwise direction.

Answer

Gear C will make more than one revolution in a counter-clockwise direction.

Answer

Gear C will make less than one revolution in a counter-clockwise direction.

Question 4

A sealed hydraulic system contains a small piston with an area of 2 square inches and a large piston with an area of 20 square inches. If a force of 100 lbs is applied to the small piston, what is the maximum weight that can be lifted by the large piston?

Accepted Answer

1000 lbs

Answer

10 lbs

Answer

100 lbs

Answer

200 lbs

Question 5

Water is flowing through a pipe that narrows in the middle and then widens again. At which point will the water pressure be the lowest?

Accepted Answer

At the narrowest point.

Answer

At the widest point before the narrow section.

Answer

At the widest point after the narrow section.

Answer

The pressure remains constant throughout the pipe.

Question 6

Which of the following is a classic example of a Class 2 lever?

Accepted Answer

A wheelbarrow

Answer

A seesaw

Answer

A pair of tweezers

Answer

A fishing rod

In the pulley system shown, a single rope is used to lift a 200 lb weight.Assuming the system is frictionless, what is the minimum force (effort) required at point 'E' to lift the weight?

In the pulley system shown, a single rope is used to lift a 200 lb weight.
Assuming the system is frictionless, what is the minimum force (effort) required at point 'E' to lift the weight?