Question 1

Brakes range in size from approximately 1 inch to inches in diameter.&#10;A)6&#10;B)12&#10;C)30&#10;D)60

Accepted Answer

The largest brake that currently exists is approximately 30 inches in diameter, making option C the correct choice. Options B and D are much larger than the largest existing brake, and option A is too small. Brakes typically range from 1 inch to 30 inches in diameter. Option A is too small, option B is too large, and option D is an extreme overestimation.

Question 2

Electric brakes have been in use since the early 1900s.

Accepted Answer

Electric brakes have been in use since the early 1900s, with the first patent for an electric brake system filed in 1904. Electric brakes were first used in the early 1900s, specifically in the 1910s and 1920s, for railway systems. They have since been adapted for use in various other vehicles and machinery.

Question 3

An electric brake consists of three friction surfaces, or shoes.

Accepted Answer

An electric brake typically consists of two main components: a brake pad (or shoe) and a brake drum or disc, not three friction surfaces or shoes.

Question 4

Series-wound brakes may be used for metal processing applications.

Accepted Answer

Series-wound brakes are commonly used in metal processing to provide high torque and holding power. Series-wound brakes are commonly used in metal processing applications to provide reliable and precise braking control.

Question 5

Magnetic brakes are suitable for loads.&#10;A)high-inertia&#10;B)centrifugal&#10;C)low-inertia&#10;D)centripetal

Accepted Answer

Magnetic brakes are suitable for high-inertia loads because they provide strong and consistent braking force, which is effective in slowing down or stopping heavy or fast-moving objects.

Question 6

The coil leads of an AC magnetic brake are normally connected directly to the motor terminals.

Accepted Answer

The coil leads of an AC magnetic brake are connected directly to the motor terminals, often through a terminal block or a plug-in connector. The coil leads of an AC magnetic brake are indeed normally connected directly to the motor terminals.

Question 7

In a magnetically operated brake, the shoes are held in a released position by a magnet the magnet coil is energized.&#10;A)even if&#10;B)until&#10;C)unless&#10;D)as long as

Accepted Answer

In a magnetically operated brake, the shoes are held in a released position by a magnet as long as the magnet's coil is energized. This means the magnetic force is active and keeps the brake shoes from engaging as long as electricity is supplied to the coil.

Question 8

Electric brakes are also known as magnetic brakes, friction brakes, and brakes.&#10;A)surface&#10;B)mechanical&#10;C)shoe&#10;D)wear

Accepted Answer

Electric brakes are also known as mechanical brakes because they use mechanical components to create friction and slow down or stop motion.

Question 9

For AC shoe brakes, the operating coils are shunt wound for across-the-line connections and series wound for connecting in series with DC motor armatures.

Accepted Answer

For AC shoe brakes, the operating coils are typically designed for direct connection to the AC supply, not specifically shunt or series wound as described. The distinction between shunt and series wound coils applies more directly to DC motors and their control methods, not to the typical design of AC shoe brakes.

Question 10

An advantage of the use of DC brakes for shunt-wound operation is .&#10;A)little AC chatter&#10;B)laminated magnets are used&#10;C)short armature movement&#10;D)armature is cast of iron

Accepted Answer

DC brakes for shunt-wound operation have the advantage of short armature movement, which allows for quick and efficient braking action.

Deck 49: Electric Brakes