Machine elements/parts
Date: 2015-10-07; view: 416.
Answer the following questions.
Match the words with their definitions.
| 1. machine 2. prime mover 3. force 4. work 5. power | a) the rate at which work is performed b) a device that uses force to accomplish something c) an effect that results in motion or physical change d) a machine whose input is a natural source of energy e) a combination of the force and the distance through which it is exerted |
1. What is a simple definition of a machine? What is a more technical definition? What does this definition imply?
2. Describe some very simple machines. Name some complex machines.
3. What do we call machines whose input is a natural source of energy? What natural sources of energy do you know and what machines use them?
4. Why aren't electric motors prime movers?
5. What is force? Give some examples of force.
6. What is work? How can work be expressed mathematically? Give an example.
7. What is power?
8. How is the rate of doing work usually given in the English-speaking countries? Why was the term invented?
9. In what terms is power measured in the metric system?
Word list:
| to move – ðóõàòè(ñÿ) to impact (on) – âïëèâàòè the entire setup– óâåñü ïðèñòð³é a valve – êëàïàí, âåíòèëü a handwheel – ìàõîâè÷îê a shaft – âàë, â³ñü a stem – ñòðèæåíü, âàë gears – øåñòåðí³ bearings – ï³äøèïíèêè to turn – âåðò³òè(ñÿ), êðóòèòè(ñÿ) to transmit – ïåðåäàâàòè torque – îáåðòàëüíèé ìîìåíò to carry – ïåðåíîñèòè friction – òåðòÿ beneath – íèæ÷å; ï³ä to connect – ç'ºäíóâàòè(ñÿ), ñïîëó÷àòè(ñÿ) vehicles – çàñîáè ïåðåñóâàííÿ to incorporate – îá'ºäíóâàòè(ñÿ), ïðèºäíóâàòè(ñÿ), ñïîëó÷àòè(ñÿ) | pistons – ïîðøí³ fluid – ð³äèíà a pipe – òðóáà to obstruct – ïåðåøêîäæàòè (ðóõîâ³) pipeline – òðóáîïðîâ³ä external – çîâí³øí³é a switch – âèìèêà÷; ïåðåìèêà÷ a wheel– çóá÷àñòå êîëåñî, øåñò³ðíÿ pumps – íàñîñè a chamber – êàìåðà to seek – íàìàãàòèñÿ; ïðàãíóòè strength – îï³ð durability – ì³öí³ñòü, ñò³éê³ñòü, òðèâê³ñòü reliably – íàä³éíî to conform – çâàæàòè (íà - to) consideration – ì³ðêóâàííÿ |
Exercises to the subject:
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| Read the text and name the main terms connected with the operation of any machine. | | | Read the text and name machine elements mentioned in it. |