ETD 363 Practice Exam 2 Problems_Spring 2023

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In the shown connection, the coefficient of friction is 0.05. Calculate the minimum allowable tightening torque to carry the load F=1000N. If high tensile bolt 9.8, calculate the design factor of safety.

Figure 8-19 is a cross-section of ASTM A36. A total of N bolts are to be used to resist a separating force of 7258.97N is one bolt. A) Determine kb,km, and C B) Determine the realized load factor for overload, the yielding factor of safety, and the load factor of joint separation.

= It is required to design a split muff coupling to transmit 60 kW power at 140 rpm. The shafts, key 420 N/mm²). The yield strength in and clamping bolts are made of plain carbon steel (σyt compression is 160% of the tensile yield strength. The factor of safety for shafts, key and bolts is 5. The number of clamping bolts is 8. The coefficient of friction between sleeve halves and the shaft is 0.3. (i) Calculate the diameter of the shaft. (ii) Specify the length and outer diameter of the sleeve halves. (iii) Find out the diameter of clamping bolts. (iv) Specify the size of key and check the dimensions for shear and compression criteria

A chain sprocket system is designed to drive a shaft. Assume the following conditions: Use SAE1018 steel for the key (which is the weakest material in comparison to other components) The chain sprocket has a bore diameter of 2.5" and the hub length of 3.125". The sprocket delivers 110 horsepower to a shaft with the rotation of 1700 rpm. Safety factor of 3 Determine 1). The dimensions of the square key: Width: in Minimum length (so the key will not fail): in 2). The minimum contact length on the hub (so the hub will not fail): in

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QUESTION 11 If a spring is made of OQ&T wire and has a wire diameter of 0.1 inch, what is ultimate strength in psi of the spring materials? QUESTION 12 A plain and ground helical compression spring has a free length of 6 inch. Calculate the pitch in inch if the spring has total 12 coils. QUESTION 13 Which of the following is not a recommended design condition for a helical compression spring? O a. E≤ 0.15 Ob.4≤ C≤ 12 Ocn 21.2 Od.3≤ ≤15

A. PROBLEM ON TOPIC "KEYS AND COUPLINGS": A coupling with material AISI C1045 as rolled transmits 65.5 HP at 1750 rpm. The material of the 1.75 inch shaft... is also AISI C1045 as rolled and the key is cold drawn AISI C1020. N= 2.5. Determine the following: 1. Size of bolt (dia.) if there are 6 bolts made of AISI C1045 as rolled at a bolt circle of 5 inches. Note: Select standard bolt diameter from AT14 of DOME by Faires (see Lecture on fasteners for this Table) Calculated Dia: Standard Size to use: 2. Required b and t if a flat or rectangular key is used: Answer: 3. Required length of key, if a flat or rectangular key is used: Note: Calculate for two type of stresses on key, then select your answer. Length Based on shear length Based on compression: Length to use: 4. Required bif a square key is used: Answer: 5. Required length of key, if a square key is used: Note: Calculate for two type of stresses on kev, then select your answer. Length Based on shear length Based on compression:…

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b) Fig. 6 shows the simplest form of an epicyclic gear train. The properties of both pinion and gear are listed in Table 1. The power transmitted is 11 kW at pinion speed of 1200 rev/min. If the module is 4 mm and has a face width of 50 mm, find the contact stress. Assume a normal pressure angle of 20° and full depth teeth. A Fig. 6 B -Arm C Parameter Material Number of Pinion (A) Gear (B) steel Cast iron 22 60 teeth Table 1

1) Find the factor of fatigue safety using Goodman failure criterion

An SAE 1050 Cold drawn steel is to be used for a square or rectangular key.  The shaft is made of SAE 4340 OQT400 and the diameter is 2.5 inches.  The torque transmitted by shaft is 15,000 lb-in. Design factor, N=2. The hub is made of SAE4340 OQT400and the  length of hub  is designed to be 3 inches.  Which one of the following square keys can be used for this design? Note: How do I determine answer if the diameter is between two values?   (a)  0.375 in x 0.375 in    (b)  0.500 in x 0.500 in    (c)  0.625 in x 0.625 in   (d)  0.750 in x 0.750 in

The following data relate to a screw jack: Pitch of the threaded screw = 8 mm Diameter of the threaded serew = 40 mm Coefficient of friction between screw and nut =0. Load = 20 kN Assuming that the load rotates with the screw determine the ratio of torques required to raise and lower the load (ii) efticiency of the machine,

Need help with condition#3 can you start from the begin please ?

A narrow V-belt (wedge belt) transmits power from an internal combustion engine operating at 700 rpm to the shaft of a dough mixer (medium duty) operating at 50 rpm. The internal combustion engine develops a nominal power of 50 kW and the dough mixer operates for no more than 8 hours per day. Which of the following belts can be used for this application? Hint: First determine the design load by using an appropriate service factor from page F12 in Appendix H in the Design Manual. SPC only SPB or SPC SPA or SPB SPB only

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Answer this ASAP plz A ball bearing operates with an equivalent radial load of 3,000 N at 750 rpm for 30% of the time, 7,000 N at 1,400 rpm for 40% of the time, 5,000 N at 900 rpm for 30% (40%) time. If the dynamic load of the bearing is 16,600 N, determine: 1. Average round, 2. Equivalent radial load (W) 3. Bearing age (L90) in units of hours.

According to " shigley's Mechanical Engineering Design " what are the missing words ?

480 ft-lbf First Gear (2.66) Final Drive (3.42) Figure 2 - Corvette Z06 and its transmission schematic. You start by measuring the 60-0 mph braking performance, which is accomplished along 30.56 m. The test weight (including the driver) was found to be 1510.5 kgf. Peak torque (@4800 rpm) 1st gear reduction Axle Torque Thrust Force After the braking test, you are asked to determine the maximum acceleration in the first gear. Consulting the manufacturer, you find out the following technical data: Final drive (differential) reduction Rolling radius of the rear tyres % weight on the rear tyres Table 1 - Technical data for the Corvette Z06 480 lbf-ft 2.66 3.42 0.327 m 65% 1) Assuming the maximum traction capacity of the tyres has been determined in the braking test, CALCULATE the maximum traction generated by the rear tyres in first gear. CALCULATE the available thrust force (i.e. traction) from the torque on the wheels.

What is the coefficient of critical damping?

how does a belt drive's velocity ratio affect performance when some slip occurs between the belt and the two pulleys?

Q(1) :A helical compression spring is to be cycled between 150 lbf and 300 lbf with a 1-in stroke.The number of cycles is low, so fatigue is not an issue. The coil must fit in a 2.1-in diameter hole with a 0.1-in clearance all the way around the spring. Use unpeened oil tempered wire with squared and ground ends. (CLO1) (i) Determine a suitable wire diameter, using a spring index of C=7.(ii) Determine a suitable mean coil diameter.(iii) Determine the necessary spring constant.(iv) Determine a suitable total number of coils.(v) Determine the necessary free length so that if the spring were compressed to its solid length, there would be no yielding.

V-belt calculation

What forces exist in series spring systems?

Key number for a woodruff key is 2428.  The nominal diameter of the key is:   (a)  28 in   (b)  24 in   (c)  3.5 in   (d)  3/4 in