Problem_Solving_05

20問 • 1年前

問題一覧

Compute the speed of the gear mounted on a 52.5 mm diameter shaft receiving power from a driving motor with 250 Hp.

C. 2 265 rpm

A set screw is necessary to fastened a pulley to a 2 in. shaft while transmits 3 Hp and rotates at 150 rpm? Find the torque on the set screw.

A. 105 ft-lb

A flexible shaft consists of a 5-mm diameter steel wire encased in a stationary tube that fits closely enough to impose a frictional torque of 2 N m/m. Determine the maximum length of the shaft if the shearing stress is not to exceed 140 Mpa.

B. 1.718 m

A cast iron flywheel with a mean diameter of 36 inches changes speed from 300 rpm to 280 rpm while it gives up 8000 ft-lb of energy. What is the coefficient of fluctuation.

A. 0.069

What is the natural frequency of an oscillating body whose period of oscillation is 1.8 s?

C. 3.49 rad/s

Determine the minimum whole depth of spur gear of 14.5° involute type with diametral pitch of 24 and circular pitch of 0.1309 inch.

B. 0.0899 inch

What is the cutting speed of a 12-in. diameter milling milling cutter turning at 190 r/min?

A. 2.9 m/s

An 8-in long steel has a cross section area of 0.25 in². After a load of 5000 lb has been applied the length is found to be 8.0065 in. Compute Stress.

C. S = 20,000 psi

A 2 in. solid shaft is driven by a 36 in. gear and transmit power at 120 rpm. If allowable shearing stress is 12 ksi, what horsepower can be transmitted ?

C. 35.89 Hp

The root diameter of a double square thread is 0.55 in. The screw has a pitch of 0.20 in. Compute the lead.

A. 0.40

What force P is required to punch a half - inch hole on a 0.25 in. thick plate if the ultimate shearing stress of the plate is 44,000 psi?

D. 17,279 lb

Find the torsional deflection of a solid steel shaft 4 inches in diameter and 48 inches long, subjected to a twisting moment of 24,000 inch-pounds.

A. 0.23 deg

A mass weighing 11.5 kg fails a distance of 1.5 m upon the top of a helical compression spring having a spring constant of 3.6 kg/cm. Determine the velocity of the mass after it has compressed the spring 203 mm.

A. 5.78 m/s

Given the modulus of elasticity ( E = 207 Gpa ) and Poisson's ratio ( μ = 0.28 ), calculate the modulus of elasticity (G).

C. 80.8 Gpa

If the circular pitch of the spur gear is 0.75 in per tooth, then the clearance is:

A. 0.0375

A helical-coil spring has a mean coil diameter of 1 inch and a wire diameter of 1/8 inch. Compute the value of Bergstrassar factor of the spring.

A. 1.172

A flywheel has a diameter of 1.5 m, and mass of 800 kg. What torque in N-m, is needed to produce an angular acceleration of 100 revolutions per minute, per second?

D. 2356

An open belt drive connects a 450 mm driving pulley to another driven pulley 1400 mm in diameter. The belt is 300 mm wide and 10 mm thick. Determine the arc of contact between the belt and the pulley considering that the center distance is 4 m.

A. 3 radians

Young modulus of a material is 200 GPa. What is its rigidity modulus if Poisson's ratio of the material is 0.3 ?

A. 76.9 × 10³ Mpa

A triple threaded worm has a pitch diameter of 3 inches. The wheel has 25 teeth and a pitch diameter of 5 inches. Compute the helix angle of the gear. Note: Material for both the wheel and the wheel is phosphor bronze.

A. 11.31°

Machine Design ( 1st Set )

Jacky Shane Luyas Buhia · 20問 · 2年前

Machine Design ( 1st Set )