Problem_Solving_03 | 暗記メーカー

暗記メーカー

Problem_Solving_03

11問 • 1年前

Jacky Shane Luyas Buhia

問題一覧

1

The shaft whose torque vanes from 2000 to 6000 in-lbs has 1 1/2 inches in diameter and 60,000 psi yield strength. Compute for the shaft mean average stress.

A. 6036 psi

2

A rectangular key is used in a pulley connected to a line shaft at 15 KW and 600 rpm. If shearing of key is 230 Mpa, determine the force acting on key length if key width is one-fourth of shaft diameter and key length is 1 inch

C. 45 KN

3

A rectangular key is used in a pulley to transmit 100 KW at 1000 rpm on 50 mm shaft diameter. Determine the force required to remove the shaft from the hub if friction is 0.4.

D. 30.55 kN

4

A steel pulley with a mean rim radius of 120 mm is rotated at a speed of 1100 rpm. If the mass of the rim is 5 kilograms, what is the centrifugal force?

B. 7961.50 N

5

A body weighing 28 Ibs rests on a horizontal surface. The force required to keep it in motion along the surface is 7 Ibs. Find the coefficient of friction.

C. 0.25

6

Compute the cutting speed in fpm of a workpiece with 2 inches diameter and running at 100 rpm.

A. 52

7

Determine the average time to cut by automatic oxygen-acetylene (machine) crosswise a 4 ft x 8 ft x 4 in thick steel plate.

B. 318 sec

8

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

A. 0.069

9

It is found that the shearing machine requires 205 joules of energy to shear a specific gauge of sheet metal. The mean diameter of the flywheel is to be 76.2 cm. the normal operating speed is 200 rpm and slow down to 180 rpm during shearing process. The rim width is 30.48 cm and the weight of cast iron is 7,196.6 kg/m^3, find the thickness of the rim, assuming that the hub and arm account for 10% of the rim weight concentrated on the mean diameter.

C. 0.587 cm

10

A flywheel rim which weighs 800 pounds has a mean diameter of 48 inches. The speed is to be maintained between 100 and 120 rpm. Considering that the effect of the arms and hub accounts for 12% of the rim weight, determine the capacity of the flywheel. Express your answer in ft-Ib.

B. 2685.7 ft-lb

11

A shearing machine requires 2000 ft-lbs of kinetic energy to operate. The mean diameter of its flywheel is 36 in. The rated speed is 66 fps at the mean diameter. The coefficient of fluctuation is 0.20. Compute the weight of the rim is needed if the effects of the flywheel arms and hubs are neglected.

A. 73.92 lbs

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問題一覧

1

The shaft whose torque vanes from 2000 to 6000 in-lbs has 1 1/2 inches in diameter and 60,000 psi yield strength. Compute for the shaft mean average stress.

A. 6036 psi

2

A rectangular key is used in a pulley connected to a line shaft at 15 KW and 600 rpm. If shearing of key is 230 Mpa, determine the force acting on key length if key width is one-fourth of shaft diameter and key length is 1 inch

C. 45 KN

3

A rectangular key is used in a pulley to transmit 100 KW at 1000 rpm on 50 mm shaft diameter. Determine the force required to remove the shaft from the hub if friction is 0.4.

D. 30.55 kN

4

A steel pulley with a mean rim radius of 120 mm is rotated at a speed of 1100 rpm. If the mass of the rim is 5 kilograms, what is the centrifugal force?

B. 7961.50 N

5

A body weighing 28 Ibs rests on a horizontal surface. The force required to keep it in motion along the surface is 7 Ibs. Find the coefficient of friction.

C. 0.25

6

Compute the cutting speed in fpm of a workpiece with 2 inches diameter and running at 100 rpm.

A. 52

7

Determine the average time to cut by automatic oxygen-acetylene (machine) crosswise a 4 ft x 8 ft x 4 in thick steel plate.

B. 318 sec

8

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

A. 0.069

9

It is found that the shearing machine requires 205 joules of energy to shear a specific gauge of sheet metal. The mean diameter of the flywheel is to be 76.2 cm. the normal operating speed is 200 rpm and slow down to 180 rpm during shearing process. The rim width is 30.48 cm and the weight of cast iron is 7,196.6 kg/m^3, find the thickness of the rim, assuming that the hub and arm account for 10% of the rim weight concentrated on the mean diameter.

C. 0.587 cm

10

A flywheel rim which weighs 800 pounds has a mean diameter of 48 inches. The speed is to be maintained between 100 and 120 rpm. Considering that the effect of the arms and hub accounts for 12% of the rim weight, determine the capacity of the flywheel. Express your answer in ft-Ib.

B. 2685.7 ft-lb

11

A shearing machine requires 2000 ft-lbs of kinetic energy to operate. The mean diameter of its flywheel is 36 in. The rated speed is 66 fps at the mean diameter. The coefficient of fluctuation is 0.20. Compute the weight of the rim is needed if the effects of the flywheel arms and hubs are neglected.

A. 73.92 lbs