Mechanical Engineering Answers

An epicyclic gear train as shown in figure the number of teeth on gear A,B,C are 48,24,50 respectively. A) If the arm rotates with 340 rpm in clockwise find Speed of C when A is fixed Speed of A when C is fixed B) Speed of B and C when arm is fixed and A is rotating with 340

A cam with minimum radius of 88 mm rotating clockwise is required to give the motion to roller follower. The motion is as described below: 1. To move outward through 70 mm during 100 deg. With Simple harmonic motion of the cam rotaion 2. To dewell for next 80 deg. 3. To return to its starting posistion during next 90 deg with uniform acceleration. 4. To dewell for the next period of a revolution. if the diameter of the roller is 5mm then Draw the cam profile 1.when the line of the stroke of the follower passes through the center of the cam shaft and 2. when the line of the stroke of the follower is off set by 15mm. 

 A pinion having 40 teeth drives a gear having 80 teeth. the profile of the gear is involute with pressure angle 20, 12 mm module and 5 mm addendum. Find the length of contact 1) Arc of contact 2) Contact ratio 3) Ratio of the pitch line velocity to Sliding velocity at start point of contact and end point of the contact 4) Angle of action for pinion and gear

Determine the crippling load for a T-section of dimensions 10 cm. x 10 cm x 2 cm and of length 5 m when it is used as strut with both of its ends hinged. Take Young's modulus, E2.0x10^5 N/mm^2

A welded joint, as shown in Fig. is subjected to an eccentric load of 2500 N.

Find the size of the weld, if the maximum shear stress in the weld is not to exceed

50 N/mm 2

A double riveted double cover butt joint in plates 20 mm thick is made with 25 mm diameter rivets at 100 mm pitch. The permissible stresses are:

= 120MPa T = 100MPa 0 150MPa Find the efficiency of joint, taking the strength of the rivet in double shear as twice than that of single shear.

A double riveted lap joint is made between 15mm thick plates. The rivet diameter and pitch are 25 mm and 75 mm, respectively. If the ultimate stresses are 400 MPa in tension, 320 MPa in shear and 640 MPa in crushing, find the minimum force per pitch which will rupture the joint. If the above joint is subjected to a load such that the factor of safety is 4, find out the actual stresses developed in the plates and rivets.

A plate 60 mm wide and 12.5 mm thick is to be welded to another plate by means of parallel fillet welds. The plates are subjected to a load of 80 kN. Find the length of the weld. Assume allowable shear strength to be 60 MPa.

A plate 60 mm wide and 12.5 mm thick is to be welded to another plate by means of parallel fillet welds. The plates are subjected to a load of 80 kN. Find the length of the weld. Assume allowable shear strength to be 60 MPa.