Bundle: Refrigeration And Air Conditioning Technology, 8th + Lab Manual + Lms Integrated For Mindtap Hvac-r, 4 Terms (24 Months) Printed Access Card
8th Edition
ISBN: 9781337087315
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Question
Chapter 2, Problem 22RQ
To determine
The formula for the amount of work accomplished in a particular task.
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Students have asked these similar questions
7. A motor shaft rotating at 1440 r.p.m. has to transmit 15 kW to a low speed shaft rotating at 500 r.p.m.
The teeth are 20° involute with 25 teeth on the pinion. Both the pinion and gear are made of cast iron
with a maximum safe stress of 56 MPa. A safe stress of 35 MPa may be taken for the shaft on which
the gear is mounted. Design and sketch the spur gear drive to suit the above conditions. The starting
torque may be assumed as 1,25 times the running torque.
Ruins 20 LW at 100 nm to another shaft running approxi
6.
A two stage reduction drive is to be designed to transmit 2 kW; the input speed being 960 r.p.m. and
overall reduction ratio being 9. The drive consists of straight tooth spur gears only, the shafts being
spaced 200 mm apart, the input and output shafts being co-axial.
2 A metal block of mass m = 10 kg is sliding along a frictionless surface with an initial speed
Vo, as indicated below. The block then slides above an electromagnetic brake that applies a
force FEB to the block, opposing its motion. The magnitude of the electromagnetic force
varies quadratically with the distance moved along the brake (x):
10
FEB = kx²,
with k
= 5
N
m²
V₁ = 8 m/s
m = 10 kg
FEB
Frictionless surface
Electromagnetic brake
⇒x
Determine how far the block slides along the electromagnetic brake before stopping, in m.
Chapter 2 Solutions
Bundle: Refrigeration And Air Conditioning Technology, 8th + Lab Manual + Lms Integrated For Mindtap Hvac-r, 4 Terms (24 Months) Printed Access Card
Ch. 2 - Matter is a substance that occupies space and has...Ch. 2 - What are the three states in which matter is...Ch. 2 - ________ is the term used for water when it is in...Ch. 2 - In what direction does a solid exert force?Ch. 2 - In what direction does a liquid exert force?Ch. 2 - Vapor exerts pressure in what direction? A....Ch. 2 - Define density.Ch. 2 - Define specific gravity.Ch. 2 - Describe specific volume.Ch. 2 - Why does an object weigh less on the moon than on...
Ch. 2 - The density of tungsten is 1210 lb/ft3. What would...Ch. 2 - The specific volume of red brass is 0.001865...Ch. 2 - Aluminum has a density of 171 lb/ft3. What would...Ch. 2 - Four pounds of a gas occupy 10 ft3. What would be...Ch. 2 - Why is information regarding the specific volume...Ch. 2 - Whose law states that the volume of a gas varies...Ch. 2 - At a constant pressure, how does a volume of gas...Ch. 2 - Describe Dalton's law as it relates to a confined...Ch. 2 - What are the two types of energy most frequently...Ch. 2 - How were fossil fuels formed?Ch. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - If an air-conditioning compressor weighing 300lb...Ch. 2 - Describe horsepower and list the three quantities...Ch. 2 - How many watts of electrical energy are equal to 1...Ch. 2 - How many Btu of heat can be produced by 4 kWh...Ch. 2 - How many Btu/h would be produced in a 12-kW...Ch. 2 - What unit of energy does the power company charge...Ch. 2 - If 3000 ft3 of air is crossing an evaporator coil...Ch. 2 - A gas is compressed inside a compressor's...
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- Q1: Determine the length, angle of contact, and width of a 9.75 mm thick leather belt required to transmit 15 kW from a motor running at 900 r.p.m. The diameter of the driving pulley of the motor is 300 mm. The driven pulley runs at 300 r.p.m. and the distance between the centers of two pulleys is 3 meters. The density of the leather is 1000 kg/m³. The maximum allowable stress in the leather is 2.5 MPa. The coefficient of friction between the leather and pulley is 0.3. Assume open belt drive.arrow_forward5. A 15 kW and 1200 r.p.m. motor drives a compressor at 300 r.p.m. through a pair of spur gears having 20° stub teeth. The centre to centre distance between the shafts is 400 mm. The motor pinion is made of forged steel having an allowable static stress as 210 MPa, while the gear is made of cast steel having allowable static stress as 140 MPa. Assuming that the drive operates 8 to 10 hours per day under light shock conditions, find from the standpoint of strength, 1. Module; 2. Face width and 3. Number of teeth and pitch circle diameter of each gear. Check the gears thus designed from the consideration of wear. The surface endurance limit may be taken as 700 MPa. [Ans. m = 6 mm; b= 60 mm; Tp=24; T=96; Dp = 144mm; DG = 576 mm]arrow_forward4. G A micarta pinion rotating at 1200 r.p.m. is to transmit 1 kW to a cast iron gear at a speed of 192 r.p.m. Assuming a starting overload of 20% and using 20° full depth involute teeth, determine the module, number of teeth on the pinion and gear and face width. Take allowable static strength for micarta as 40 MPa and for cast iron as 53 MPa. Check the pair in wear.arrow_forward
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