Structural Engineering III MCQ with Answers

71) Dynamic friction as compared to static friction is

Answer is:

less

Explanation:

Static Friction The friction experienced by a body, when it is at rest is known as static friction.

Dynamic Friction The friction experienced by a body, when it is in motion is called dynamic friction. Dynamic friction is also called as kinetic friction.

Dynamic friction always less than static friction.
The ratio of static friction to dynamic friction is always greater than one.

Dynamic friction as compared to static friction is

72) Tangent of angle of friction is equal to

Answer is:

coefficient of friction

73) Kinetic friction is the

Answer is:

the friction force acting when the body is in motion

Explanation:

Static Friction The friction experienced by a body, when it is at rest is known as static friction.

Dynamic Friction The friction experienced by a body, when it is in motion is called dynamic friction. Dynamic friction is also called as kinetic friction.

74) The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to

Answer is:

Wtan(a + <)>)

75) A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is \i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Answer is:

71) Dynamic friction as compared to static friction is

less

72) Tangent of angle of friction is equal to

coefficient of friction

73) Kinetic friction is the

the friction force acting when the body is in motion

74) The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to

Wtan(a + <)>)

slant down towards direction of pull