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1. An electrical transformer must produce 12 V a.c. output from 240 V a.c. input. The primary has 2000 turns. How many turns are needed on the secondary? 2. A pressure intensifier must increase the pressure from 10 bar to 100 bar. What must be the ratio of the piston diameters? 3. A lever must magnify the movement of a mechanism from 0.1 mm to 2 mm. What must be the ratio of the lengths either side of the fulcrum? 4. A pair of simple gears must magnify the rotation angle by 4/1. If there are 20 teeth on the small gear, how many must there be on the large gear?

1. An electrical transformer must produce 12 V a.c. output from 240 V a.c. input. The primary has 2000 turns. How many turns are needed on the secondary? 2. A pressure intensifier must increase the pressure from 10 bar to 100 bar. What must be the ratio of the piston diameters? 3. A lever must magnify the movement of a mechanism from 0.1 mm to 2 mm. What must be the ratio of the lengths either side of the fulcrum? 4. A pair of simple gears must magnify the rotation angle by 4/1. If there are 20 teeth on the small gear, how many must there be on the large gear?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter9: Components For Electric Motors
Section: Chapter Questions
Problem 12RQ
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1. An electrical transformer must produce 12 V a.c. output from 240 V a.c. input. The primary has 2000 turns. How many turns are needed on the secondary? 2. A pressure intensifier must increase the pressure from 10 bar to 100 bar. What must be the ratio of the piston diameters? 3. A lever must magnify the movement of a mechanism from 0.1 mm to 2 mm. What must be the ratio of the lengths either side of the fulcrum? 4. A pair of simple gears must magnify the rotation angle by 4/1. If there are 20 teeth on the small gear, how many must there be on the large gear?
Transcribed Image Text:1. An electrical transformer must produce 12 V a.c. output from 240 V a.c. input. The primary has 2000 turns. How many turns are needed on the secondary? 2. A pressure intensifier must increase the pressure from 10 bar to 100 bar. What must be the ratio of the piston diameters? 3. A lever must magnify the movement of a mechanism from 0.1 mm to 2 mm. What must be the ratio of the lengths either side of the fulcrum? 4. A pair of simple gears must magnify the rotation angle by 4/1. If there are 20 teeth on the small gear, how many must there be on the large gear?
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