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Chapter 1
Work Done and Power
Section (A)
Question No.1 – Blank Type
Fill in the blanks.
- The SI unit of force is ………. .
- The unit of force in SI is ………. .
- The unit ……… is the same as newton meter.
- The unit of work done in British system is ………. .
- A wound clock spring has the ………. energy.
- The energy may be given in terms of ……. .[or the electron volt]
- The unit kilowatt is the unit of ………. .
- The product of the force applied and the ………. can be expressed as power.
- The product of the force and the velocity is equal to ………. .
- The product of the force and velocity is ……….. .
- The …….. is the product of the force and velocity.
- The rate of doing work is defined as ……. .
- The rate of doing work is ………. .
- In British engineering system, the power of motors and engines are also expresses in ….... .
- 1 hp is equal to …..erg s-1.
- One mega watt is equivalent to ……… watt.
- If the work done in 9s is 63 J, the power is ……. .
- There are …….. W in 1 hp.
- 1 kW power is ……… than 1 hp.
- The unit watt is the same as …… .
- The unit one joule per second is equivalent to ……… .
- The mechanical advantage of a machine depends on the ………. present.
- Mechanical advantage is the ratio of the …… to the effort.
- The velocity ratio is usually much greater than ………. .
- If a machine is …….. the mechanical advantage will be equal to the velocity ratio.
26.The ability to retain the original form is called ……… . - The ratio of the stress to the strain is ……… .
- A spring obeys ……… law.
- Within elastic limit ….. is directly proportional to the strain.
- The strain produced is proportional to the ………. .
- The force applied to an elastic body is called ………. .
- The ratio of the load to ……. is defined as mechanical advantage.
- The ……… of a machine is always less than 100%.
- One ……… is equal to a rate of energy transfer of 1 joule per second.
35.The SI unit of power is ……… . - The SI unit of the mechanical power is ……. .
- If the work work is defined as ………. .
Key - newton(N) 2. newton(N) 3. joule(J) 4. foot-pound(ft-lb) 5. potential 6. joule(J)
- power 8. velocity 9. power 10. power 11. power 12. power 13. power
- horse power(hp) 15. 7.46 x 109 16. 106 17. 7 W 18. 746 19. greater
- joule per second(J s-1) 21. one watt 22.friction 23. load 24. one 25. perfect
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