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# Applied Mechanics AM 3rd Sem/Common/Dec 2018 Diploma Paper

## SECTION-C

#### Q3. Attempt any three questions.                                                       3×10=30

1. Find the magnitude and direction of the resultant of the following force
1. 30 N due
2. 35 N due north-west.
• 15 N due
1. 16 N due 450 west of south
2. 32 N due 750 North
1. An electric light fixture weighing 50N hangs from a point c, by two strings AC and BC. The string Ac is inclined at 600 to horizontal and BC at 450 to the vertical. Determine the forces in string AC and
2. What do you mean by force? Explain Force
3. Derive an equation for equilibrium of a body lying on a rough inclined plane when the motion is in downward direction and force is acting parallel to the

## applied Mechanics 3rd Sem/Civil/dec 2018 Diploma Solved Question Paper

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### Section a applied Mechanics 3rd Sem/Civil/dec 2018 Diploma Solved Question Paper

Weight is a _____________ quantity The forces passing through the same point are called __________ force. The angle of friction is always _________ than 90 degree. The ___________ effect of the force is called moment. C.G. is a term used for the bodies having _______ Only.  Axis passing through the centroid of the plane lamina is called ___________ axis. Rolling friction is always __________ than sliding friction.  In an ideal machine, velocity ratio = ___________________ Coefficient of friction is = _________ / _____________ The unit of moment in SI system is __________________  A couple cannot be replaced by a __________ Force. A machine is said to be irreversible if its efficiency is __________ than 50%. One kilogram force is equal to _______________ N Efficiency ___________ as the load decreases.

### Section B :applied Mechanics 3rd Sem/Civil/dec 2018 Diploma Solved Question Paper

Differentiate between center of gravity and centroid.

Comparison between center of gravity and centroid.

Explain the concept of rigid body and free body diagram.

Concept of rigid body and free body diagram.

Define Triangle Law of forces and Lami`s theorem.

Triangle Law of forces and Lami`s theorem.

Where the C.G. does lies of sphere, circular cone, and right circular cylinder?

Where the C.G. does lies of sphere, circular cone, and right circular cylinder

What do mean by moment center and moment arm and moment of a couple?

Define moment center and moment arm and moment of a couple

Define friction. Give merits and demerits of friction.

Friction. Give merits and demerits of friction.

Establish a relation between efficiency, mechanical advantage and velocity ratio of a machine.

Relation between efficiency, mechanical advantage and velocity ratio of a machine.

## applied Mechanics 3rd Sem/Civil /dec 2018 Diploma Solved Question Paper

### Section c :-applied Mechanics 3rd Sem/Civil/dec 2018 Diploma Solved Question Paper

Find Angle between two forces of magnitude Numerical.

Angle between two forces of magnitude Numerical.

Explain the methods of reducing friction.

Methods of reducing friction.

Define the following a. Mechanical advantage