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Intermediate level 16 During a prony brake test on a motor (see Fig. 4), the following scale and speed read- ings were noted: P2 = 5 lbf P1 = 28 lbf %3D n = 1160 r/min %3D If the diameter of the pulley is 12 inches, calculate the power output of the motor in kilowatts and in horsepower. 17 A motor drives a flywheel having a moment of

Intermediate level 16 During a prony brake test on a motor (see Fig. 4), the following scale and speed read- ings were noted: P2 = 5 lbf P1 = 28 lbf %3D n = 1160 r/min %3D If the diameter of the pulley is 12 inches, calculate the power output of the motor in kilowatts and in horsepower. 17 A motor drives a flywheel having a moment of

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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20 21 temperature of a 50 gallon (U.S.) reservoir to 1 the new [r/min] of to 180°F, tb How many Btus are to raise the If the in 22 is reduce 99 FUNDAMENTALS OF MECHANICS AND HEAT 12 A motor drives a load at cw speed of 1000 r/min. The motor develops a cw torque of 12 N•m, and the load exerts a ccw torque of (Note: The torque exerted by remains the same.) The electric motor in a trolley bu a power output of 80 hp at 1200 r bus moves up a hill at a speed of 3 15 N.m. a. Will the speed increase or decrease? b. If this situation persists for some time, in what direction will the shaft eventually will it take electric hea hour. Assuming that the A large inc per rotate? 25 gear| a. The torque developed by the mon b. The force opposing the motion of metallic b' 13 Referring to Fig. 12, if Ty = 40 N-m, what is the power delivered by the motor? using an a temperatu run hotte %3D [N] snq Calculate the heat [MJ] required to 14 Referring to Fig. 13, if Ty = 40 N-m and = 50 r/min, calculate the power delivered by the motor. 26 An elects n¡ = an area c perature ture is 2 is giver point o to 100°C. 15 Referring to Fig. 14, if Ty = 40 N-m and 50 r/min, calculate the by the motor. Repeat Problem 20 for 100 kg of power received aluminum. 22 The motor in Fig. 23 drives a hoist, Intermediate level During a prony brake test on a motor (see Fig. 4), the following scale and speed read- ings were noted: mass m of 800 kg at a uniform rate of 5 m/s. The winch has a radius of 20 cm Calculate the torque [N-m] and speed [r/min] of the motor. Answers Note: The rounded o are precec ol.W P, = 5 lbf P = 28 lbf %3D %3D 1.392 N 2. 14.5 hp 7a 8.415.7 J 13. zero 1- n = 1160 r/min If the diameter of the pulley is 12 inches, calculate the power output of the motor in kilowatts and in horsepower. 17 A motor drives a flywheel having a moment of inertia of 5 kg•m?. The speed increases from 1600r/min to 1800 r/min in 8 s. Calculate a. the torque developed by the motor [N•m] b. the energy in the flywheel at 1800 r/min [kJ] c. the motor power [W] at 1600 r/min d. the power input [W] to the flywheel at 1750 r/min W Motor Figure 23 Electric hoist, Problem 22. 23 to 1 m/s, calculate the new speed [r/min torque [ft•lbf] of the motor. 18 A dc motor coupled to a large grinder devel- ops 120 hp at a constant speed of 700 r/min. The moment of inertia of the revolving parts is 2500 lb-ft². a. Calculate the torque [N m] developed by the motor. Industrial application How many Btus are required to raise the 24 temperature of a 50 gallon (U.S.) reservo b. Calculate the motor torque [N•m] needed aneed will increase țo 750 of water from 55°F to 180°F, assuming ingulated, How long
Transcribed Image Text:20 21 temperature of a 50 gallon (U.S.) reservoir to 1 the new [r/min] of to 180°F, tb How many Btus are to raise the If the in 22 is reduce 99 FUNDAMENTALS OF MECHANICS AND HEAT 12 A motor drives a load at cw speed of 1000 r/min. The motor develops a cw torque of 12 N•m, and the load exerts a ccw torque of (Note: The torque exerted by remains the same.) The electric motor in a trolley bu a power output of 80 hp at 1200 r bus moves up a hill at a speed of 3 15 N.m. a. Will the speed increase or decrease? b. If this situation persists for some time, in what direction will the shaft eventually will it take electric hea hour. Assuming that the A large inc per rotate? 25 gear| a. The torque developed by the mon b. The force opposing the motion of metallic b' 13 Referring to Fig. 12, if Ty = 40 N-m, what is the power delivered by the motor? using an a temperatu run hotte %3D [N] snq Calculate the heat [MJ] required to 14 Referring to Fig. 13, if Ty = 40 N-m and = 50 r/min, calculate the power delivered by the motor. 26 An elects n¡ = an area c perature ture is 2 is giver point o to 100°C. 15 Referring to Fig. 14, if Ty = 40 N-m and 50 r/min, calculate the by the motor. Repeat Problem 20 for 100 kg of power received aluminum. 22 The motor in Fig. 23 drives a hoist, Intermediate level During a prony brake test on a motor (see Fig. 4), the following scale and speed read- ings were noted: mass m of 800 kg at a uniform rate of 5 m/s. The winch has a radius of 20 cm Calculate the torque [N-m] and speed [r/min] of the motor. Answers Note: The rounded o are precec ol.W P, = 5 lbf P = 28 lbf %3D %3D 1.392 N 2. 14.5 hp 7a 8.415.7 J 13. zero 1- n = 1160 r/min If the diameter of the pulley is 12 inches, calculate the power output of the motor in kilowatts and in horsepower. 17 A motor drives a flywheel having a moment of inertia of 5 kg•m?. The speed increases from 1600r/min to 1800 r/min in 8 s. Calculate a. the torque developed by the motor [N•m] b. the energy in the flywheel at 1800 r/min [kJ] c. the motor power [W] at 1600 r/min d. the power input [W] to the flywheel at 1750 r/min W Motor Figure 23 Electric hoist, Problem 22. 23 to 1 m/s, calculate the new speed [r/min torque [ft•lbf] of the motor. 18 A dc motor coupled to a large grinder devel- ops 120 hp at a constant speed of 700 r/min. The moment of inertia of the revolving parts is 2500 lb-ft². a. Calculate the torque [N m] developed by the motor. Industrial application How many Btus are required to raise the 24 temperature of a 50 gallon (U.S.) reservo b. Calculate the motor torque [N•m] needed aneed will increase țo 750 of water from 55°F to 180°F, assuming ingulated, How long
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