Mechanical Engineering Answers

Axes Q2 and Q4 are fixed. Q2A = 1 1/2 inches., AB = 3 inches., Q4B= 2 inches., and Q2Q4=3 inches. crank 2 is the driver turning counterclockwise. the proportions are such that, while 2 makes a complete revolution , 4 oscillates through a certain angle. Find the two extreme positions of the center line Q4B of crank 4.

What welding process will you recommend to weld the circumferential weld holding the bottom attachment ( weld 2) . Design the welding geometry to weld the cylinder body to ( weld 2) the bottom plate. Assume cylinder wall thickness to be 0.5” and the bottom plate thickness to be 1 inch. Show the welding symbol. Assume cylinder diameter to be 2 inches

a 65 mm diameter solid shaft is to be welded to a flat plate by a fillet weld around the circumference of the shaft. determine the size of the weld if the torque on the shaft is 3 kn m. the allowable shear stress in the weld is 70 mpa.

a 125 x 95 x 10 mm angle is joined to a frame by two parallel fillet welds along the edges of 150 mm leg. the angle is subjected to a tensile load of 180 kn. find the lengths of weld if the permissible static load per mm weld length is 430 n 

A balloon is rising vertically upward with a uniform velocity 'u' as shown At a certain instant, a ball No. 1 is dropped trom it, which takes a 4 seconds to reach the ground. The moment this ball strikes the ground, another ball is dropped from the balloon and this 2nd ball takes 5 seconds to reach the ground. Find the velocity of the balloon 'u' and height from which both the balls must have been dropped.

A continuous cable (diameter 6 mm) with tension force T is attached to a horizontal frame member at B and C to support a sign structure, Fig. 1. The cable passes over a small pulley at D. The wire is made of a copper alloy, and the stress-strain relationship for the wire is (a) Find the axial normal strain in the cable and its elongation due to the load W = 6.8 kN (b) If the forces are removed, what is the permanent set of the cable. Hint: Start with constructing the stress-strain diagram and determine the modulus of elasticity, E and the 0.2% offset yield stress.

In a Diesel engine inlet pressure and temperature are 1 bar and 17 oC respectively. Pressure at the end of adiabatic compression is 35 bar. The ratio of expansion i.e. after constant pressure heat addition is 5. Calculate the heat addition, heat rejection and the efficiency of the cycle. Assume Cv = 0.717 kJ/ kg K, 𝛾=1.4 

Deduce an expression for Air-standard efficiency of Otto cycle. A diesel engine has a

compression ratio of 22 and cut-off take place at 7% of the stroke. Find the efficiency

 Slider crank mechanism as shown in the figure calculate the i) Acceleration of the slider B ii) Acceleration of the point E iii) Angular acceleration of the link AB OA rotates at (30+X) rad/s in counter clockwise direction (<b><i>10 marks</i></b>) X is the last digit of the student roll no. for example if the student roll no is <b><i>36</i></b> then X=36 and ω=30+36=66 rad/s. Draw the neat and clean diagram with proper scale. Rough drawings will not be considered

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Slider crank mechanism as shown in the figure calculate the

i) Acceleration of the slider B

ii) Acceleration of the point E

iii) Angular acceleration of the link AB

OA rotates at (30+X) rad/s in counter clockwise direction