Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 2, Problem 34R
Why is it important to have a planned maintenance program for tools and equipment?
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Chapter 2 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 2 - What is the key to preventing accidents in a...Ch. 2 - Who is ultimately responsible for the welder’s...Ch. 2 - Describe the three classifications of burns.Ch. 2 - What emergency steps should be taken to treat...Ch. 2 - List the three types of light that may be present...Ch. 2 - Which type of light is the most likely to cause...Ch. 2 - What can be done on the job site to reduce the...Ch. 2 - What is the name of the eye burn that can occur in...Ch. 2 - In what two ways can ultraviolet light burn the...Ch. 2 - Why is it important to seek medical treatment for...
Ch. 2 - What fabric(s) are the best choice to wear as...Ch. 2 - Describe the ideal work shirt, pants, boots, and...Ch. 2 - Why is it unsafe to carry butane lighters or...Ch. 2 - What special protective items can be worn to...Ch. 2 - Why must eye protection be worn at all times in...Ch. 2 - What types of injuries can occur to the ears...Ch. 2 - What types of protection are available to protect...Ch. 2 - What types of information should be covered in a...Ch. 2 - Name two types of respirators and describe how...Ch. 2 - List the materials that can give off dangerous...Ch. 2 - Why must metal that has been used before be...Ch. 2 - Under what conditions can natural ventilation be...Ch. 2 - Name two advantages of recycling scrap metal.Ch. 2 - When must forced ventilation be used?Ch. 2 - Who must be provided with safety data sheets...Ch. 2 - Describe an acceptable storage area for a cylinder...Ch. 2 - How must high-pressure gas cylinders be stored so...Ch. 2 - What should be done with a leaking cylinder if the...Ch. 2 - Why is it important for acetylene cylinders to not...Ch. 2 - What is hot work?Ch. 2 - How far away should highly combustible materials...Ch. 2 - When is a fire watch needed?Ch. 2 - List the four types of fire extinguishers and the...Ch. 2 - Why is it important to have a planned maintenance...Ch. 2 - Why is it important to keep a welding area clean?Ch. 2 - What should you do if you have to leave a piece of...Ch. 2 - Why must a mushroomed chisel or hammer be...Ch. 2 - What causes most electric shock in the welding...Ch. 2 - According to the Welding Safety Checklist in...Ch. 2 - What can happen if too much power is being carried...Ch. 2 - Why must equipment be turned off and unplugged...Ch. 2 - According to Table 2-2, what gauge wire size would...Ch. 2 - What is a GFCI?Ch. 2 - List five safety tips for safe extension cord use.Ch. 2 - List 10 safety rules for the safe use of portable...Ch. 2 - Why is it important to not weld when everything is...Ch. 2 - List two types of grinders used by welders.Ch. 2 - How close to the grinding stone face should the...Ch. 2 - Name metal cutting machines used in the welding...Ch. 2 - Describe how a person should safely lift a heavy...Ch. 2 - List the things that should be inspected on a...Ch. 2 - List and explain five ladder use safety rules.
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- 20 3. 2-233 2520 Тр Gears 1079 A pair of helical gears consist of a 20 teeth pinion meshing with a 100 teeth gear. The pinion rotates at Ta 720 r.p.m. The normal pressure angle is 20° while the helix angle is 25°. The face width is 40 mm and the normal module is 4 mm. The pinion as well as gear are made of steel having ultimate strength of 600 MPa and heat treated to a surface hardness of 300 B.H.N. The service factor and factor of safety are 1.5 and 2 respectively. Assume that the velocity factor accounts for the dynamic load and calculate the power transmitting capacity of the gears. [Ans. 8.6 kWarrow_forward4. A single stage helical gear reducer is to receive power from a 1440 r.p.m., 25 kW induction motor. The gear tooth profile is involute full depth with 20° normal pressure angle. The helix angle is 23°, number of teeth on pinion is 20 and the gear ratio is 3. Both the gears are made of steel with allowable beam stress of 90 MPa and hardness 250 B.H.N. (a) Design the gears for 20% overload carrying capacity from standpoint of bending strength and wear, (b) If the incremental dynamic load of 8 kN is estimated in tangential plane, what will be the safe power transmitted by the pair at the same speed?arrow_forwardDetermine the stress in each section of the bar shown in Fig. when subjected to an axial tensile load shown in Fig. The central section is 30 mm hollow square cross- section; the other portions are of circular section, their diameters being indicated What will be the total deformation of the bar? For the bar material E = 210GPa. 20mi О 30mm 30mmm 2.6 15mm 30kN 1 2 10kN - 20kN 3 -329 91mm 100mm 371mmarrow_forward
- Calculate the load that will make point A move to the left by 6mm, E=228GPa. The diameters of the rods are as shown in fig. below. 2P- PA 80mm B 200mm 2P 0.9m 1.3m.arrow_forwardIf the rods are made from a square section with the dimension as shown. Calculate the load that will make point A move to the left by 6mm, E=228GPa. 2P- P A 80mm B 200mm 2P 0.9m 1.3marrow_forward3. 9. 10. The centrifugal tension in belts (a) increases power transmitted (b) decreases power transmitted (c) have no effect on the power transmitted (d) increases power transmitted upto a certain speed and then decreases When the belt is stationary, it is subjected to some tension, known as initial tension. The value of this tension is equal to the (a) tension in the tight side of the belt (b) tension in the slack side of the belt (c) sum of the tensions in the tight side and slack side of the belt (d) average tension of the tight side and slack side of the belt The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (d) is given by 60° (a) p=d sin (c) p=d sin (120° T where T Number of teeth on the sprocket. 90° (b) p=d sin T 180° (d) p=d sin Tarrow_forward
- OBJECTIVE TYPE QUESTIONS 1. The maximum fluctuation of energy is the 2. (a) sum of maximum and minimum energies (b) difference between the maximum and minimum energies (c) ratio of the maximum energy and minimum energy (d) ratio of the mean resisting torque to the work done per cycle In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called (a) fluctuation of energy (b) maximum fluctuation of energy (c) coefficient of fluctuation of energy (d) none of the above Chapter 16: Turning Moment Diagrams and Flywheel 611 The ratio of the maximum fluctuation of speed to the mean speed is called 3. (a) fluctuation of speed (c) coefficient of fluctuation of speed 4. (b) maximum fluctuation of speed (a) none of these The ratio of the maximum fluctuation of energy to the.......... is called coefficient of fluctuation of energy. (a) minimum fluctuation of energy (b) work done per cycle The maximum fluctuation of energy in a flywheel is equal to 5.…arrow_forwardOBJECTIVE TYPE QUESTIONS 1. The velocity ratio of two pulleys connected by an open belt or crossed belt is 2. (a) directly proportional to their diameters (b) inversely proportional to their diameters (c) directly proportional to the square of their diameters (d) inversely proportional to the square of their diameters Two pulleys of diameters d, and d, and at distance x apart are connected by means of an open belt drive. The length of the belt is (a)(d+d₁)+2x+ (d₁+d₂)² 4x (b)(d₁-d₂)+2x+ (d₁-d₂)² 4x (c)(d₁+d₂)+ +2x+ (d₁-d₂)² 4x (d)(d-d₂)+2x+ (d₁ +d₂)² 4x 3. In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then (a) open belt drive is recommended (b) cross belt drive is recommended (c) both open belt drive and cross belt drive are recommended (d) the drive is recommended depending upon the torque transmitted Due to slip of the belt, the velocity ratio of the belt drive 4. (a) decreases 5. (b) increases (c) does not change When two pulleys…arrow_forwardQ3: (10 MARKS) A piston with a weight of 29.4 N is supported by a spring and dashpot. A dashpot of damping coefficient c = 275 N.s/m acts in parallel with the spring of stiffness k = 2400 N/m. A fluctuating pressure p = 960 sin 30t N/m² acts on the piston, whose top surface area is 0.05 m². Determine the steady-state displacement as a function of time and the maximum force transmitted to the base. P=Po sin cot Warrow_forward
- 9. Design a spur gear drive required to transmit 45 kW at a pinion speed of 800 r.p.m. The velocity ratio is 3.5 : 1. The teeth are 20° full-depth involute with 18 teeth on the pinion. Both the pinion and gear are made of steel with a maximum safe static stress of 180 MPa. Assume a safe stress of 40 MPa for the material of the shaft and key. 10. Design a pair of spur gears with stub teeth to transmit 55 kW from a 175 mm pinion running at 2500 r.p.m. to a gear running at 1500 r.p.m. Both the gears are made of steel having B.H.N. 260. Approximate the pitch by means of Lewis equation and then adjust the dimensions to keep within the limits set by the dynamic load and wear equation.arrow_forward7. 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 approxiarrow_forward6. 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.arrow_forward
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