Which type of brake applies the braking force tangentially?

Band brakes

In a shoe brake, the frictional force is proportional to the applied force according to the equation f_fr = μ' F. What does μ' represent?

The coefficient of friction

True or False: A single shoe brake is self-locking for both clockwise and anticlockwise rotation.

False. A single shoe brake can be self-locking for clockwise rotation but not for anticlockwise rotation.

Riddle: I grip tightly when engaged, my force depends on friction's rage. With two shoes, I share the load, who am I?

Double shoe brake

Fill-in-the-blanks: In a disc brake, the frictional torque is given by ______, where μ is the coefficient of friction and r is the radial distance.

T = μ × F × r

What is the primary function of friction materials in mechanical brakes?

To provide a high and reproducible coefficient of friction.

Which equation relates the tensions in a band brake to the angle of wrap and coefficient of friction?

T1/T2 = e^(μα)

In an external expanding shoe brake, the pressure is assumed to be proportional to ______ from the pivot point.

The perpendicular distance

True or False: The analysis for internal expanding shoe brakes is completely different from that of external expanding shoe brakes.

False. The analysis for internal and external expanding shoe brakes is similar.

What is the effect of wear on the frictional contact pressure in a disc-type axial clutch?

It causes the axial force required to transmit the same torque to increase.