Part 4 - mdsp

A simply supported beam 9 meters long carries concentrated loads of 100 kN at every one third section, Compute the maximum moment of the beam?

• 450 kN-m*

• 200 kN-m

• 300 kN-m

• 150 kN-m

What is the tensile load if a %" x 4" x 12' steel tie rod experience an 80°F temperature decrease from no stress temperature? (Note: = 6.5 x 10-6/°F)

• 31200 lb (C)*

• 23000 lb (C)

• 424000 lb (C)

• 234000 lb (C)

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.

• 237.4 mm

• 477.2 mm

• 274.7 mm

• 227.4 mm*

A heavy-duty shaft coupling is to be secured with 25-mm bolts at a distance of 150 mm from the shaft center. The shaft transmits 4 330 kW of power at a speed of 1 200 rpm. If the allowable shearing stress for the bolts is 100 MPa, how many bolts are required?

• 3 bolts

• 6 bolts

• 5 bolts*

• 4 bolts

A 1.75-inch-diameter shaft is supported by two sleeve bearings. The total load on the two bearings is 2800 lb. find the friction power loss, in Hp, if the coefficient of friction between shaft and bearing is 0.10 and the shaft rotates 200 rpm.

• 0.88 Hp

• 0.78 Hp*

• 0.98 Hp

• 0.68 Hp

A vertical steel cylinder water tank is 30 m in diameter and 45 m high. The allowable stress of the steel plate is 1224 kg/cm2. Without reinforcing angle bars and rods, what is the thickness of the steel plate?

• 55.15 mm*

• 51.55 mm

• 65.15 mm

• 61.55 mm

What the bursting steam pressure of a hemispherical steel shell with a diameter of 100 inches and made of 0.0635-m thick steel plate, if the joint efficiency is 70 % and the tensile strength is 60 000 psi?

• 4 020 psi

• 4 200 psi*

• 2400 psi

• 2040 psi

What modulus of elasticity in tension is required to obtain a unit deformation of 0.00105 from a load producing a unit tensile stress of 3163.27 kg/cm2?

• 10 psi

• 40 x 10^6 psi

• 43 x 10^6 psi*

• 45 x 10^6 psi

An iron column of annular cross-section has an outer diameter of 200 mm and is subjected to force of 75 KN. Find the thickness of the wall if the allowable compressive stress is 10 Mpa.

• 12.75 mm*

• 15.75 mm

• 16.75 mm

• 17.75 mm

A steel tie rod on bridge must be made to withstand pof 5000 lbs. Find the diameter of the rod assuming a factor of safety of 5 and the ultimate stress of 64,000 psi.

• 0.75 in.

• 0.79 in.

• 0.84 in.

• 0.71 in.*