Mechanical Engineering Books Free Download PDF

Mechanical Engineering Book PDF

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Contents in Mechanical Engineering Books Free Download PDF

1.1Prime movers

“Prime mover is a device which uses natural sources to convert their energy into

mechanical energy or useful work (shaft power)”.

1.2 Sources of energy

Prime movers are using various natural sources of energy like fuel, the flow of river

water, atom, biomass, wind, etc.

(i) Fuel: When fuel is burnt, heat energy is liberated. The amount of heat liberated by the burning of

fuel depends upon the calorific value of that fuel. By using a heat engine, heat energy is

converted into mechanical energy (shaft power). Fuel is the most widely used source of

energy.

(ii) The flow of river water: This is another useful source of energy. Water stored at high

elevation contains potential energy. When water starts flowing, potential energy gets

converted to kinetic energy. The hydraulic turbine is a prime mover which converts the kinetic

energy of flowing water into mechanical energy.

(iii) Atoms (Nuclear Energy): Nuclear energy or atomic energy is a recent development. Heat

energy produced by the fission or fusion of atoms may be used to produce shaft power by

heat engines.

(iv)Nonconventional Energy Sources: these energy resources replenish themselves naturally

in a relatively short time and therefore will always be available. Examples of these

resources are solar energy, wind energy, tidal energy, bioenergy, solid wastes, etc. Almost

all nonconventional energy resources offer a pollution-free environment and also help in

maintaining the ecological balance.

Questions And Answers

Q1. दो कारे क्रमशः 60 और 108 कि.मी./ घंटा की गति से शहर A से शहर B तक यात्रा करती है | यदि एक कार यात्रा के लिए दूसरी कार की तुलना में 2 घंटा कम समय लेती है, तो शहर A से शहर B के बीच की दुरी कितनी होगी?

(a) 270 km/ 270 कि.मी.

(b) 324 km/ 324 कि.मी.

(c) 405 km/ 405 कि.मी.

(d) 216 km/ 216 कि.मी.

 

Q2. यदि (4x ­- 5) = (3x -­ 1), तो  का संख्यात्मक मान क्या है?

(a) 16

(b) 64

(c) 32

(d) 8

 

Q3. A किसी काम का 50%, 12 दिन म पूरा करता है,फिर वह B को बुलाता है तथा वे दोनों मिलकर बचा हुआ काम 8 दिन में पूरा करते हैं | पूरा काम अकेले करने में B को कितना समय लगेगा ?

(a) 12 days/ 12 दिन

(b) 24 days/ 24 दिन

(c) 36 days/ 36 दिन

(d) 48 days/ 48 दिन

Q.4  में, D और E क्रमश: AB और AC पर बिंदु हैं। DE, BC के समानांतर है। यदि AD, DB और AE की लंबाई क्रमश: 8 से.मी., 4 से.मी. और 12 से.मी.हैं, तो AC की लंबाई क्या होगी?

(a) 6 cm/ 6 से.मी.

(b) 18 cm/ 18 से.मी.

(c) 9 cm/ 9 से.मी.

(d) 15 cm/ 15 से.मी.

 

Q.5  3.5 से.मी. की त्रिज्या और 27 से.मी. की ऊंचाई वाले एक शंकु को पूरी तरह से पानी से भरा जाता है। इस पानी को 2.1 से.मी. त्रिज्या वाले एक खाली बेलनाकार बर्तन में खाली कर दिया है। इस बर्तन में पानी की ऊंचाई क्या होगी? 

(a) 50 cm/ 50 से.मी.

(b) 25 cm/ 25 से.मी.

(c) 12.5 cm/ 12.5 से.मी.

(d) 37.5 cm/ 37.5 से.मी.