Engineering Answers

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 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.

10.Determine the maximum mean diameter of a taper in for use to fix a lever to a

shaft. If it transmit a maximum torque of 750 in-lb. The shaft diameter is 3in.

5. An 18mm diameter rivet is used to fasten two 22mm thick plate. If the

shearing stress is 60 MPA. What tensile force applied each plate to shear the

bolt?

( Ans F=15.27KN )

3. A 4.3in diameter by 3in long journal bearing is to carry a 6600lb load at 4600

r[, isomg SAE 40 lube oil at 200 through a single hole at 25 psi. Compute

the bearing pressure. Bearing pressure is the same as bearing stress.

( Ans Sb=511.63psi )

2. If the ultimate shear strength of a steel plate is 35000psi, what force is

necessary to punch a 0.35 in. diameter hole in a 0.255 in. thick plate?

( Ans F=9813.55 lb )

1. A steel tie rod on bridge be made withstand a pull of 3500lbs. find the

diameter of the rod assuming a factor of safety of 2.5 and ultimate stress of

5700psi.

( Ans d=1.398 in. )

A barite composed of 100% BaSO4 is fused with carbon in the form of coke containing 6% ash (which is infusible). The composition of the fusion mass is

BaSO4 11.1%

BaS 72.8

C 13.9

Ash 2.2

_____

100%

Reaction:

BaSO4 + 4C → BaS + 4CO

Find the excess reactant, the percentage of the excess reactant, and the degree of completion of the reaction. 

A steady stream of air enters a horizontal compressor at the rate of 0.02 kg/s. The air temperature is 10o C at entry and 300o C at exit. The velocity of the air is 30 m/s at entry and 6 m/s at exit. During its passage through the compressor, the air experiences a heat loss of 105 kJ/kg of air. Calculate:

(a) The change in kinetic energy per kg of air

(b) The change in enthalpy per kg of air

(c) The work done per kg of air

(d) The power required to drive the compressor

(e) The volume of air entering the compressor per second

(f) The flow area of the entry pipe if the entry pressure is 1 bar Take R = 0.287 kJ/kgK and cp = 1.005 kJ/kgK