Compre_Quiz_4

19問 • 1年前

問題一覧

If two parallel shafts are connected by cylinders in pure rolling contact and turning in the same direction, and having a speed ratio of 2.75, what is Center distance of the two shafts assuming that the diameter of the smaller cylinder is 22 cm?

A. 19.25 cm

A flange coupling is to transmit 15,000 in-Ib between two 2.5" diameter shafts. How many ½" diameter bolts in a 6" diameter bolt circle are required if the shear stress in each bolt is limited to 3000 psi?

A. 9 bolts

Determine the Hp lost when a collar is loaded with 2000 lb, rotates at 50 rpm, and has a coefficient of friction of 0.15. The outside diameter of the collar is 4 inches and the inside diameter is 2 inches.

c. 0.3714 hp

A vertical steel cylinder water tank is 30 m in diameter and 45 m high. The allowable stress of the steel plate is 1224 kg/cm'. Without reinforcing angle bars and rods, what is the thickness of the steel plate?

a. 55.15 mm

What is the polar section modulus of a solid shaft with a diameter of 101.6 mm?

c. 205.9 cm

The transmitted torque of a hollow shaft is 3400 N-m at a shearing stress of 55 MPa. If the outside diameter is 1.25 times that of the inside diameter, what is the inside diameter, in mm?

b. 64.87

A roller chain and sprocket is to drive vertical centrifugal discharge bucket elevator. The pitch of chain connecting sprockets is 1.75". The driving sprocket is rotating at 120 pm and has 11 teeth while the driven sprocket is rotating at 38 pm. Determine the number of teeth of driven sprocket.

c. 35 teeth

A 20-tooth motor sprocket, running at 1200 pm, drives a blower at a speed ratio of 4:1. Using the largest permissible chain size and the largest permissible center distance of 80 pitches, what length of chain in pitches is required to connect the sprockets?

b. 212 pitches

A 20° straight-tooth bevel pinion having 14 teeth and a diametral pitch of 6 teeth/inch drives a 42-tooth gear. The two shafts are at right angles and in the same plane. Find the pitch angle of the pinion.

a. 18.4°

Which of the following materials can easily be machined?

b. AISI C1112

A triple-thread worm has a lead angle of 17° and a pitch diameter of 2.2802 inches. Find the center distance when the worm is mated with a wheel of 48 teeth.

a. 6.72 inches

It is an acronym in machining. This process uses an electrode to remove metal from a workpiece by generating electric sparks between conducting surfaces.

c. EDM

If stiffness is the main criterion in selecting a material, which of the following is the most economical choice?

b. SAE 1020

In die casting accurate parts made of steel, what shrinkage allowance in inches per inch is recommended?

b. 0.022

This radial distance in a gear is measured between the addendum and dedendum circle, snd is the sum of the addendum and the dedendum? How do you call this distance?

b. Whole depth

This radial distance of a gear is measured from the clearance circle to the root circle, and is the difference between the dedendum of one gear and addendum of the mating gear. What is this radial distance?

c. Clearance

A precision cut gear transmits 25 Hp at a pitch line velocity of 6000 fpm. If the service is intermittent, find the dynamic load.

b. 274.05 lb

A round steel shaft rotates at 200 rpm and is subjected to a torque of 275 N-m and a bending moment of 415 N-m. Determine the equivalent twisting moment.

b. 497.85 N-m

A 36-tooth pinion turning at 300 rpm drives 120-tooth gear of 14.5° involute full depth pressure angle. Determine the rpm of the driven gear.

c. 90 rpm

Machine Design ( 1st Set )

Jacky Shane Luyas Buhia · 20問 · 2年前

Machine Design ( 1st Set )