Q.4 Which of the statements given below is/are correct ? (1) Pressure angle is defined as the angle between the direction of follower movement & the normal to the base curve at any point. (2) In case of radial translating roller follower, parabolic motion of the follower is very appropriate for high speed cams. A Only 1 B Only 2 C Both 1 & 2 Neither 1 nor 2

Q.4 Which of the statements given below is/are correct ? (1) Pressure angle is defined as the angle between the direction of follower movement & the normal to the base curve at any point. (2) In case of radial translating roller follower, parabolic motion of the follower is very appropriate for high speed cams. A Only 1 B Only 2 C Both 1 & 2 Neither 1 nor 2

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A cam, with a minimum radius of 25 mm, rotating clockwise at a uniform speed is to be designed to give a roller follower, at the end of a valve rod, motion described below : 1. To raise the valve through 50 mm during 120° rotation of the cam ; 2. To keep the valve fully raised through next 30°; 3. To lower the valve during next 120°; and 4. To keep the valve closed during rest of the revolution i.e. 90° ; The diameter of the roller is 20 mm and the diameter of the cam shaft is 25 mm. Draw the profile of the cam when (a) the line of stroke of the valve rod passes through the axis of the cam shaft, and (b) the line of the stroke is offset 15 mm from the axis of the cam shaft. The displacement of the valve, while being raised and lowered, is to take place with simple harmonic motion. Determine the maximum acceleration of the valve rod when the cam shaft rotates at 100 r.p.m. Draw the displacement, the velocity and the acceleration diagrams for one complete revolution of the cam.
A cam, with a minimum radius of 25 mm, rotating clockwise at a uniform speed is to be designed to give a roller follower, at the end of a valve rod, motion described below : To raise the valve through 50 mm during 120° rotation of the cam To keep the valve fully raised through next 30° To lower the valve during next 120°; and To keep the valve closed during rest of the revolution i.e. 90° ; The diameter of the roller is 20 mm and the diameter of the cam shaft is 25 mm. The displacement of the valve, while being raised and lowered, is to take place with simple harmonic motion. b) Determine the maximum acceleration of the valve rod when the cam shaft rotates at 100 r.p.m.
A cam, with a minimum radius of 25 mm, rotating clockwise at a uniform speed is to be designed to give a roller follower, at the end of a valve rod, motion described below : To raise the valve through 50 mm during 120° rotation of the cam To keep the valve fully raised through next 30° To lower the valve during next 120°; and To keep the valve closed during rest of the revolution i.e. 90° ; The diameter of the roller is 20 mm and the diameter of the cam shaft is 25 mm. The displacement of the valve, while being raised and lowered, is to take place with simple harmonic motion. c) Draw the displacement, the velocity and the acceleration diagrams for one complete revolution of the cam.
Q8:-The following particulars relate to a symmetrical circular flank cam operating a flat- faced follower in 4-stroke engine:- base circle radius=25 mm, nose circle radius=8 mm, lift of the valve=10 mm, total angle of action of the cam=120° and the engine speed=1000 rpm. Determine: - (a) the flank radius, (b) maximum velocity and (c) maximum acceleration and retardation of the follower. If the mss of the follower and valve with which it is in contact is 4 kg, find the minimum force to be exerted by the spring to overcome the inertia of the valve parts.
A cam, with a minimum radius of 30 mm, rotating clockwise at a uniform speed is to be designed to give a roller follower, at the end of a valve rod, motion described below : To raise the valve through 60 mm during 150° rotation of the cam;To keep the valve fully raised through next 30° (Dwell);To lower the valve during next 90°; and To keep the valve closed during rest of the revolution i.e. 90° (Dwell); The diameter of the roller is 20 mm and the diameter of the cam shaft is 30 mm. Draw the displacement, the velocity and the acceleration diagrams for one complete revolution of the cam when the cam shaft rotates at 180 r.p.m. Draw the cam profile when the line of the stroke is offset 20 mm from the axis of the cam shaft. The displacement of the valve, while being raised is to take place with simple harmonic motion and lowered with uniform acceleration.
Qv quality number for camberless straight bevel pinion gear with 20 teeth and a modulus of 4 mmis 6. Made of 1st quality steel, with a hardness of 300 HB, the pinion and the reciprocating gear are completelyhardened. The rotated gear has 60 teeth. Pinion life is 109 cycles and reliabilitycoefficient is 0.999. Shaft angle is 90o, pinion rotation speed is 900 rpm. Tooth width 32 mm andThe normal pressure angle is 20o. Based on AGMA bending strength, the strength of the gear systemcalculate. Load factor Ko =1, safety factor SF =1.
Draw a Cam with uniform motion of follower based on the following data. 45 mm minimum diameter of Cam, 50 mm lift (rise) with uniform velocity, 0º to 90º Rise, 90º to 180º Top dwell, 180º to 270º Fall, 270º to 360º bottom dwell, clockwise rotation. The diameter of Cam Shaft hole is 25mm.
8.7 A pair of involute gears with 16° pressure angle and 6 mm module is in mesh. The number of teeth on pinion is 16 and its rotational speed is 240 r.p.m. When the gear ratio is just 1.75, find, in order that the interference is just avoided, (a) the addenda on pinion and gear wheel (b) the length of path of contact, and (d) the maximum velocity of sliding of teeth on either side of the pitch point. (DAV Indore, 1989) (Ans. a, 9.6 mm; a 4.2 mm; 35.41 mm; V = 95.58 cm/s) %3D
(i) An engine shaft running at 4.5r.p.s. is required to drive a machine shaft by means of a belt. The pulley on the engine shaft is of 3.5m diameter and that of the machine shaft is 2m diameter. If the belt thickness is 9mm.Determine the speed of the machine shaft, when 1. There is no slip 2. There is a slip of 3% (ii) A cam, with a minimum radius of 25 mm, rotating clockwise at a uniform speed is to be designed to give a roller follower made of 20mm diameter at the end of a valve rod, motion described below : 1. To raise the valve through 58 mm during 122° rotation of the cam by simple harmonic motion 2. To keep the valve fully raised through next 32° 3. To lower the valve during next 66° by uniform acceleration and retardation. Determine the maximum velocity and…
In a single-stage gear wheel system with an evolvent profile, the rotating (driveThe number of teeth of the gear is Z1=10, the number of teeth of the rotated gear is Z2=20 and the modulus is m=5 mm; The rotating gear rotates clockwise. d) Prevent undercutting, if it exists on the same shape, by enlarging the grip angle. Calculate the value of the new grip angle and compare it with the new grip angle value you obtained from the drawing.
The figure shows spur gear wheels consisting of two stages with an electric motor used to drive a rope drum. Engine rpm nm = 970 rpm ; desired speed of drum nT = 50 rpm ;since the drum diameter is DT = 40 cm and the load from the rope is Qh = 4000 N: ⦁ (İt) how much is the total cycle rate? ⦁ z4 find the number of teeth of the drum gear, How much is the drum speed realized in this case? ⦁ find the rotation moment on the drum shaft ⦁ since the collection efficiency of the mechanism is nt = 0.82 How much “ Nm " motor power should be
(ii) A cam, with a minimum radius of 25 mm, rotating clockwise at a uniform speed is to be designed to give a roller follower made of 20mm diameter at the end of a valve rod, motion described below : 1. To raise the valve through 58 mm during 122° rotation of the cam by simple harmonic motion 2. To keep the valve fully raised through next 32° 3. To lower the valve during next 66° by uniform acceleration and retardation. Determine the maximum velocity and acceleration of the valve rod when the cam shaft rotates at 104 r.p.m and write the remaining dwell angle.