Mechanical Engineering Answers

a steel beam (g=77gpa) is applied with torques

A Planar Closed kinematics chain ABCD is formed rigid link AB= 2.0m , BC = 3.0m, CD = 2.5m, and DA = 2.7m with all revolute joint. Which link to be fixed obtain a double rocker mechanism ?

 A spur gear having module 7 mm. The smallest teeth numbers are 10. If the speed is 

1300 r.p.m. Then find out the pitch line velocity

Make a two-handed process chart for a nut-bolt assembly.

A planar closed kinematics chain ABCD is formed with rigid links AB = 2.0m, BC = 3.0m,CD = 2.5m, and DA = 2.7m with all revolute joints. Explain which of the link to be fixed to obtain a double rocker mechanism.

Using Grubler's criterion for plane mechanism, prove that the minimum number of binary links in a constrained mechanism with simple hinges is four.

A pump is driven by an electric motor running at 1145 rpm and the speed of the compressor is 920 rpm. If the diameter of the motor pulley is 160 mm, calculate the diameter of the pump pulley

Two rectangles SO by 50 cm are placed perpendic J arly with a common e Ti 1000 K while surface two balance with 2 large surround ling room at 300 heat lost from the surface at 1000 K to surface number 2.

In a crank and slotted lever mechanism, the distance between the fixed center is 150mm and the driving crank is 75mm long. Determined the ratio of the time taken on the cutting and return strokes .

Questions

1. A bar AB of weight W is hinged to a vertical wall at A

and supported at B by a string BC as shown in Figure. 

Find the magnitude of tensile force in the string BC.

Take α = 300

.

2. A 750 N man stands on the middle rung of a 250 N 

ladder, as shown in figure. Assuming the end B rest on 

the corner of a wall and a stop at A to prevent slipping, 

determine the reaction at A and B.

3. A right angled bar is supported by roller at B and a 

hinge at A, as shown in Figure. Find the reaction at A 

and B due to a load P applied as shown.

4. A roller of radius 100 mm and weight 200 N is to be 

publled over a curb of height 40 mm by a force P 

applied at the center O, as shown in Figure. Find the 

minimum force P required to start the roller over the 

curb.