JSS2 school exam

1. Domestic pipeline fitting has the following components, EXCEPT

2. A valve controlling the release of liquid or gas is called

3. Axe is used for

4. Another name for sumo is called

5. The applying of substance to a component to reduce friction is called

6. Methods of reducing friction are as follows EXCEPT

7. Which one is NOT a type of lubricant

8. The turning point of a lever is called

9. One of these is NOT a type of simple machine

10. A fastner characterized by a helical ridge is called

11. Examples of complex machines are as follows EXCEPT

12. A drive mechanism used to transmit mechanical power from one point to another is called

13. When effort balances a load , the ratio of the load to the effort is called

14. The component of a hydraulic and pneumatic machines that encloses a piston is called

15. Site preparation includes the following, EXCEPT

16. A shovel can be used in the following way, EXCEPT

17. One of these is not a mechanical tools for site preparation

18. The following are types of Taps, EXCEPT

19. Upthrust occurs due to

20. Upthrust is a A FORCE, while density is

Subjective (Answer All) 2marks each

1. The two styles of tap are lever tap and _______ tap.

2. Timbering is a tool used during __________

3. Principle of transmissibility of pressure was discovered by _______

4. The type of excavation that involve the use of mechanically operated machine is called ______

5. The similarity between hydraulic and pneumatic machines is that _________________

6. One of the advantage of gear is ________________

7. Chain drive are made up of _______ and _______

8. Belts are used to connect two ___________ together for transmission of energy

9. The helical ridge characterized by a screw is also known as _________

10. In machines, sliding friction can be replaced by rolling friction. This method of friction reduction is termed ____________.

Theory (Answer All)

1a. Define the following terms : (i) Friction (ii) Lubrication

1b. State two advantages of friction

2a. If a gear ⚙️ with 48teeths whose speed of rotation is 12rpm drives another gear with 32teeths . Determine the speed of the 32teeths gear.

2b. Differentiate between hydraulic machine and pneumatic machine.

3a. State the principle of transmissibility of pressure.

3b. A certain uses effort of 50,000g to overcome a load of 200,000g. If the efficiency of the machine is 80%, determine it's velocity ratio.

4. Mention 3 differences between upthrust and density.