PART 5 -MDSP

Determine the thickness of a steel air receiver with 30 in. diameter and pressure load of 120 psi, design stress of 8000 psl.

• 1/4 in*

• 3/8 in.

• 5/8 in.

• 1/2 in.

It is specified that the angular deformation in a shaft should not to exceed 10 in a length of 1.8 m. The allowable shearing stress is 83 MPa. Determine the diameter of the shaft. The shaft material has G= 77 x 106 Pa.

• 342.22 mm

• 232.24 mm

• 222.34 mm*

• 322.24 mm

A 3-inch diameter shaft of material with a yield point value of 50 000 psi has a 0.75 x 0.75 x 5-inch key. What must the minimum yield point value be for the material in the key in order to transmit the torque of the shaft? The factor of safety is equal to 2.

• 47 100 psi*

• 47 500 psi

• 46 100 psi

• 46 500 psi

A 63.5-mm-diameter shaft has a key 16 x 16 mm. The shaft material tests 400 MPa at yield point. The factor of safety equals 2. The shaft fits into a cast-iron hub for which the working stress in compression is 125 MPa. What length of the key in the hub material will be required to carry the torque of the solid shaft? The key material is assumed to be amply strong.

• 148.4 mm

• 158.4 mm*

• 168.4 mm

• 138.4 mm

A 75-mm diameter shaft is transmitting 300 kW at 600 rpm. A flange coupling is used and has 6 bolts, each 18 mm in diameter. Find the required diameter of the bolts circle based on an average shearing stress of 27.5 MPa.

• 277.4 mm*

• 477.2 mm

• 274.7 mm

• 247.7 mm

A flanged coupling is designed to use 6 bolts on a 101.6-mm-diameter bolts circle. The allowable stress in shear is 12000 psi; the maximum torque is 50 ft-lb. Find the diameter of the bolt.

• 0.073 inch*

• 0.037 inch

• 0.370 inch

• 0.730 inch

A vertical steel cylinder water tank is 30 m in diameter and 45 m high. The allowable stress of the steel plate is 120 MPa. Without reinforcing angle bars and rods, determine the thickness of the steel plate.

• 53.2 mm

• 56.2 mm

• 65.2 mm

• 55.2 mm*

A cylinder having an internal diameter if 508 mm and external diameter if 914.4 mm is subjected to an internal pressure of 69 MPa and an external pressure of 14 MPa. Determine the hoop stress at the inner surface of the cylinder.

• 91.11 Mpa

• 91.10 MPa

• 90.11 Mpa*

• 19.10 Mpa

What is the common cutting fluids used for cutting metals?

• Water with soda and borax

• Light mineral oil

• Solube Oil

• All of these*

Good stabilizer in stainless steel.

• Columbium

• Titanium

• Tantalium

• All of these