English for automobile engineering - Unit 3: Rotary system

UNIT 3Lecturer: Lang Van ThangENGLISH FOR AUTOMOBILE ENGINEERINGROTARY SYSTEMPresentation Read the text and complete Practice 1a) D has a number of teeth F.b) B has a diameter C.d) 	 has a faster speed F.g) B has a greater number of teeth than A; the speed of 	 is therefore .e) The speed of is slower than the speed of .f) C has a smaller A, so A has a speed.greatergreaterfasterEBnumber of teeth thanBUsing Figure 3.2 to complete the text below:c) F has a speed .than than thanDslowerthan CSlower than APractice 2a) The ratio of the number of teeth is the size ratio.c) A:C and D:F are .b) The two gear system in Figure 3.2 are	 .d) The movement of A is 	 the movement of B.Choose a, b, c, d or e to complete the sentences. Use Figure 3.2 and Table 3.1 below:e) The speed of B is 	the speed of A.f) The direction of movement of D is 	the direction of movement F.becadbPractice 3Practice 31. If the movement of the bottom pulley is anticlockwise, the movement of the is also .Top pulleyAnticlockwise 2. If is clockwise, the movement of the bottom pulley is also .the movement of the top pulleyclockwise 3. If the movement of the front sprocket is anticlockwise, the movement of .the rear sprocket is also Anticlockwise 4. small gear , the movement of the large gear is .If the movement of theclockwise is anticlockwise5. If large is clockwise, the movement of the small gear is .the movement of theanticlockwise gearPractice 4Read the text following; then complete the second one. Use Figures 2.5 and 2.6.In pulley systems, the diameter of the pulleys is very important. In pulley system in Figure 2.5, the diameter of the top pulley is 20 cm and the diameter of the bottom pulley is 10 cm.If the speed of the top pulley is 100 revolutions per minute (100 rev/min), the speed of the bottom pulley is 200 rev/ min.Practice 4Read the text following; then complete the second one. Use Figures 2.5 and 2.6.Bikes have a sprocket and chain system. The number of teeth on the sprockets is very important. On the bike in Figure 2.6, the has 32 teeth and .If front sprocket is 60 rev/min, the .Therefore:frontsprocketThe rear sprocket has 16 teeththe speed of thespeed of the rear sprocket is 120 rev/minSpeed of rear sprocket Speed of front sprocket teeth of front sprocket teeth of rear sprocket =x Practice Speed of rear sprocket Speed of front sprocket Diameter of front sprocket Diameter of rear sprocket =x