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engineering
machine elements in mechanical design

Questions and Answers of Machine Elements In Mechanical Design

Remote, noncontact, temperature sensing is possible by focusing radiation from the source onto a pyroelectric material and by using the charge that appears on its surface as a measure of temperature.
magneto strictive actuator has and active core of length L=20 mm. It is made of Terfenol D, a giant magneto strictive alloy of terbium, dysprosium and iron. If a field sufficiently large to saturate
It is proposed to replace the cast iron casing of a power tool with one with precisely the same dimension molded from nylon. Will the material cost of the nylon casing be greater or less than that
Plastics are sometimes portrayed as environmentally poor because most are synthesize from oil or natural gas, implying a larger embodied energy and carbon footprint than other materials. Is this an
For Problems 1–6, design a bolted joint to join the two members shown in the appropriate figure. Specify the number of bolts, the pattern, the bolt grade, and the bolt size. Figure P20-1 0.50-in
For Problems 1–6, design a bolted joint to join the two members shown in the appropriate figure. Specify the number of bolts, the pattern, the bolt grade, and the bolt size. Figure P20-2 Rigid
For Problems 1–6, design a bolted joint to join the two members shown in the appropriate figure. Specify the number of bolts, the pattern, the bolt grade, and the bolt size. Figure P20-3 2 in- C6 x
For Problems 1–6, design a bolted joint to join the two members shown in the appropriate figure. Specify the number of bolts, the pattern, the bolt grade, and the bolt size. Figure
For Problems 1–6, design a bolted joint to join the two members shown in the appropriate figure. Specify the number of bolts, the pattern, the bolt grade, and the bolt size. Figure P20-5 8
For Problems 1–6, design a bolted joint to join the two members shown in the appropriate figure. Specify the number of bolts, the pattern, the bolt grade, and the bolt size. Figure
For Problems 13–16, design a welded joint to join the two aluminum members shown in the appropriate figure. Specify the weld pattern, the type of filler alloy, and the size of weld. The types of
For Problems 13–16, design a welded joint to join the two aluminum members shown in the appropriate figure. Specify the weld pattern, the type of filler alloy, and the size of weld. The types of
For Problems 13–16, design a welded joint to join the two aluminum members shown in the appropriate figure. Specify the weld pattern, the type of filler alloy, and the size of weld. The types of
For Problems 13–16, design a welded joint to join the two aluminum members shown in the appropriate figure. Specify the weld pattern, the type of filler alloy, and the size of weld. The types of
List eight factors to be considered in the selection of an electric motor.
List six items that must be specified for electric motors.
Define duty cycle.
How much variation in voltage will most AC motors tolerate?
State the relationship among torque, power, and speed.
What does the abbreviation AC stand for?
Describe and sketch the form of single-phase AC power.
Describe and sketch the form of three-phase AC power.
What is the standard frequency of AC power in the United States?
What is the standard frequency of AC power in Europe?
What type of electrical power is available in a typical American residence?
How many conductors are required to carry single-phase power? How many for three-phase power?
Define synchronous speed for an AC motor.
Define full-load speed for an AC motor.
What is the synchronous speed of a four-pole AC motor when running in the United States? In France?
If a four-pole motor operates on 400-Hz AC power, what will its synchronous speed be?
A motor nameplate lists the full-load speed to be 3450 rpm. How many poles does the motor have? What would its approximate speed be at zero load?
If an AC motor is listed as a normal-slip, four-pole/six-pole motor, what will its approximate full-load speeds be?
What type of control would you use to make an AC motor run at variable speeds?
Describe a C-face motor.
Describe a D-flange motor.
What does the abbreviation NEMA stand for?
Describe a protected motor.
Describe a TEFC motor.
Describe a TENV motor.
What type of motor enclosure would you specify to be used in a plant that manufactures baking flour?
What type of motor would you specify for a meat grinder if the motor is to be exposed?
Define locked-rotor torque. What is another term used for this parameter?
What is meant if one motor has a poorer speed regulation than another?
Refer to the AC motor performance curve in Figure P21–34. Data in Figure P21–34.a. What type of motor is the curve likely to represent? b. If the motor is a six-pole type, rated at 0.75
Define breakdown torque.
Name the four most common types of single-phase AC motors.
Figure P21–37 shows the speed/torque curve for a household refrigeration compressor, designed to operate at 3450 rpm. Specify a suitable motor, giving the type, power rating in watts, and number of
A cooling fan for a computer is to operate at 1725 rpm, direct-driven by an electric motor. The speed/torque curve for the fan is shown in Figure P21–36. Specify a suitable motor, giving the type
How is the speed adjusted for a wound-rotor motor?
What is the full-load speed of a 10-pole synchronous motor?
What is meant by the term pull-out torque, as applied to a synchronous motor?
Discuss the reasons that universal motors are frequently used for handheld tools and small appliances.
Why is the adjective universal used to describe a universal motor?
Name four ways to produce DC power.
List 12 common DC voltages.
What is an SCR control? For what is it used?
If a DC motor drive advertises that it produces low ripple, what does the term mean?
If you want to use a DC motor in your home, and your home has only standard 115-V AC, single-phase power, what will you need? What type of motor should you get?
List seven advantages of DC motors with respect to AC motors.
Discuss two disadvantages of DC motors.
Name four types of DC motors.
What happens to a series-wound DC motor if the load on the motor falls to nearly zero?
Assume that a permanent magnet DC motor can exert a torque of 15.0 N · m when operating at 3000 rpm. What torque could it exert at 2200 rpm?
List 10 functions of a motor control.
What size motor starter is required for a 10-hp, three phase motor, operating on 220 V?
A single-phase, 110-V AC motor has a nameplate rating of 1.00 kW. What size motor starter is required?
What does the term plug stopping mean, and how is it accomplished?
Why is a fuse an inadequate protection device for an industrial motor?
What type of motor control enclosure would you specify for use in a car wash?
What could you do to the control circuit for a standard series DC motor to give it a controlled no-load speed?
What happens if you connect a resistance in series with the armature of a shunt-wound DC motor?
What happens if you connect a resistance in series with the shunt field of a shunt-wound DC motor?
Specify the required torque rating for a clutch to be attached to a motor shaft running at 1750 rpm. The motor is rated at 5.0 hp and is of the design B type.
Specify the required torque rating for a clutch to be attached to an electric motor shaft running at 1150 rpm. The motor is rated at 0.50 hp and drives a light fan.
Specify the required torque rating for a clutch to be attached to a diesel engine shaft running at 2500 rpm. The engine is rated at 75.0 hp.
An alternative design for the system described in Problem 1 is being considered. Instead of putting the clutch on the motor shaft, it is desired to place it on the output shaft of a speed reducer
Specify the required brake torque rating for each of the conditions in Problems 1–4 for average industrial conditions. Data in Problems 1–4,An alternative design for the system described in
Specify the required torque rating for a clutch in N · m if it is attached to a design B electric motor shaft rated at 20.0 kW and rotating at 3450 rpm.
The assembly shown in Figure P22–9 is to be stopped by a brake from 775 rpm to zero in 0.50 s or less. Compute the required brake torque.Data in Figure P22–9, Coupling 11 Hub- Bearing 2.25- 3.00
Compute the required clutch torque to accelerate the system shown in Figure P22–10 from rest to a motor speed of 1750 rpm in 1.50 s. Neglect the inertia of the clutch. Data in Figure P22–10,
A clutch-brake module is to be connected between a design C electric motor and a speed reducer. The motor is rated at 50.0 kW at 900 rpm. Specify the required torque ratings for the clutch and the
Compute the torque required to accelerate a solid steel disc from rest to 550 rpm in 2.0 s. The disc has a diameter of 24.0 in and is 2.5 in thick.
A winch, sketched in Figure P22–11, is lowering a load at the speed of 50 ft/min. Compute the required torque rating for the brake on the winch shaft to stop the system in 0.25 s. Data in
Figure P22–12 shows a tumbling barrel being driven through a wormgear reduction unit. Evaluate the torque rating required for a clutch to accelerate the barrel to 38.0 rpm from rest in 2.0 s,Data
Compute the dimensions of an annular plate-type brake to produce a braking torque of 75 lb · in. Air pressure will develop a normal force of 150 lb between the friction surfaces. Use a coefficient
The solid steel cylinder shown in Figure P22–22 is used as a guide roller for a paper processing system. In normal operation, it rotates at an angular velocity of 800 rpm. A disc caliper brake is
Design a short shoe drum brake to produce a torque of 100 lb · ft. Specify the drum diameter, the configuration of the actuation lever, and the actuation force.
Design a long shoe drum brake to produce a friction torque of 100 lb · ft to stop a load from 480 rpm. Specify the friction material, the drum size, the shoe configuration, pivot locations, and
Design a band brake to exert a braking torque of 75 lb · ft while slowing a drum from 350 rpm to rest. Specify a material, the drum diameter, the band width, the angle of coverage of the friction
See Figure P12–1. The shaft rotating at 550 rpm carries a spur gear B having 96 teeth with a diametral pitch of 6. The teeth are of the 20°, full-depth, involute form. The gear receives 30 hp from
See Figure P12–2. The shaft rotating at 200 rpm carries a spur gear C having 80 teeth with a diametral pitch of 8. The teeth are of the 20°, full-depth, involute form. The gear delivers 6 hp to a
See Figure P12–3. The shaft rotating at 480 rpm carries a spur pinion B having 24 teeth with a diametral pitch of 8. The teeth are of the 20°, full-depth, involute form. The pinion delivers 5 hp
See Figure P12–4. The shaft rotating at 120 rpm carries a spur gear A having 80 teeth with a diametral pitch of 5. The teeth are of the 20°, full-depth, involute form. The gear receives 40 hp from
See Figure P12–5. The shaft rotating at 240 rpm carries a spur gear D having 48 teeth with a diametral pitch of 6. The teeth are of the 20°, full-depth, involute form. The gear receives 15 hp from
See Figure P12–6. The shaft rotating at 310 rpm carries a spur pinion E having 36 teeth with a diametral pitch of 6. The teeth are of the 20°, full-depth, involute form. The pinion delivers 20 hp
See Figure P12–7. The shaft rotating at 480 rpm carries a spur gear C having 50 teeth with a diametral pitch of 5. The teeth are of the 20°, full-depth, involute form. The gear receives 50 hp from
See Figure P12–7. The shaft rotating at 480 rpm carries a spur pinion A having 30 teeth with a diametral pitch of 6. The teeth are of the 20°, full-depth, involute form. The pinion delivers 30 hp
See Figure P12–9. The shaft rotating at 220 rpm carries a spur pinion C having 60 teeth with a diametral pitch of 10. The teeth are of the 20°, full-depth, involute form. The pinion delivers 5 hp
See Figure P12–9. The shaft rotating at 220 rpm carries a spur gear D having 96 teeth with a diametral pitch of 8. The teeth are of the 20°, full-depth, involute form. The gear receives 12.5 hp
See Figure P12–9. The shaft rotating at 220 rpm carries a spur pinion F having 60 teeth with a diametral pitch of 10. The teeth are of the 20°, full-depth, involute form. The pinion delivers 5 hp

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