IBEW Aptitude Test Mechanical Principles and Pulleys Questions and Answers 2

Question 1

A block-and-tackle system has 4 rope segments supporting the load. If the load weighs 400 lbs, what force must be applied (ignoring friction)?

Accepted Answer

100 lbs

Answer

50 lbs

Answer

80 lbs

Answer

160 lbs

Question 2

Which type of lever is a wheelbarrow an example of?

Accepted Answer

Second-class lever

Answer

First-class lever

Answer

Third-class lever

Answer

Fourth-class lever

Question 3

Two gears are meshed together. Gear A has 20 teeth and Gear B has 60 teeth. If Gear A rotates at 180 RPM, at what speed does Gear B rotate?

Accepted Answer

60 RPM

Answer

90 RPM

Answer

120 RPM

Answer

540 RPM

Question 4

Which simple machine is a screw considered?

Accepted Answer

A wedge wrapped around a cylinder

Answer

A lever with a rotating fulcrum

Answer

A wheel and axle with grooves

Answer

A pulley with fixed bearings

Question 5

A fixed pulley is used to lift a 200-lb load. What effort force is required?

Accepted Answer

200 lbs

Answer

100 lbs

Answer

150 lbs

Answer

250 lbs

Question 6

If a 6-foot lever is used with the fulcrum 2 feet from the load, and a 300-lb load is placed on the short end, what effort is needed at the other end?

Accepted Answer

150 lbs

Answer

75 lbs

Answer

100 lbs

Answer

200 lbs