Basic Technology JSS 2 Third Term Examination

Third Term Examination

Class : JSS 2

Subject : Basic Technology

Name : ______________________________________

Instruction : Answer all questions correctly.

Section A : Objectives Questions

1. Which of these is Not used in rescue operation? (a) digger  (b) shovel  (c) whistle  (d) trowel

2. The following are metal work machines found in the workshop EXCEPT  (a) circular saw  (b) Milling machine  (c) central lathe  (d) shaping machine

3. The air used for pneumatic tools is supplied by __________.  (a) pump  (b) wind mill  (c) compressor  (d) fan

4. Which of these is Not an example of a drive machine?  (a) Gear  (b) Chain  (c) Pulley  (d) Steering

5. Which of the following causes wears and tears of machine part?  (a) Friction  (b) Heat  (c) Pressure  (d) Corrosion

6. First aid helps an injured person in the following ways EXCEPT __________.  (a) It makes the injured person happy  (b) prevents loss of life   (c) treat the victim before doctor’s attention  (d) stop condition from worsening

7. A plane figure bounded by ten straight line is called _________.  (a) hexagon  (b) nonagon  (c) decagon  (d) octagon

8. Chain drives are used in the following machine EXCEPT   (a) bicycle  (b) motorcycle  (c) sewing machine  (d) elevators

9. Pneumatic devices make use of __________  (a) air  (b) solar  (c) oil  (d) diesel

10. Gear drives are used to transmit _______  (a) force  (b) energy  (c) work  (d)  power

11. Friction is a force which _______________.  (a) opposes motion  (b) causes movement   (c) generates energy   (d) increases motion

12. Which of these saws is used for cutting complex shapes in woodwork?  (a) Tenon saw  (b) Dovetail saw  (c) Coping saw  (d) Fret saw

13. The function of a brake system is to ___________.  (a) minimize motion  (b) stop motion  (c) stabilize motion  (d) control motion

14. Site preparation includes the following  except ___________.  (a) cutting of grass  (b)moulding of blocks  (c)uprooting of trees  (d) removal of top soil

15. Which of the following is used in the transmission of power in a bicycle?   (a) Spoke  (b) Gear  (c) Chain  (d) Pedal

16. Which of the following is Not a type of belt?  (a) Flat belt  (b) Open belt drive  (c) V-belt  (d) Timing belt

17. The following are applications of belt drives Except ___________. (a) Refrigerators  (b) Pepper grinder  (c) Motorcycle  (d) Sewing machine

18. A __________ can be defined as a series of links connected by pin joints.  (a) Belt  (b) Chain  (c) Gear  (d) Pulley

19. Chain drives are classified into the following Except ____________.  (a) Hauling chains  (b) Power transmission chains  (c) Load lifting chains  (d) Sliding chains

20. The following are advantages of belt drives Except ___________.  (a) Longer life is not possible  (b) No lubrication is needed  (c) Simple in construction  (d) They are used where slip is important

21. _________ is the gear that transmits speed to the other gear.  (a) Bevel gear  (b) Driving gear  (c) Gear ratio  (d) Driven gear

22. _________ simply means the engagement of the teeth of the gears.  (a) Driving gear  (b) Gearing  (c) Meshing of gears  (d) Gear ratio

23. __________ can be defined as a relationship between two gears in which it shows how much larger the speed of one gear is than the other.  (a) Gear ratio  (b) Driven gear  (c) Driving gear  (d) Bevel gear

24. _________ is the arrangement of gears on shaft. (a) Chain drives  (b) Gearing  (c) Belt drives  (d) Meshing

25. In the gearbox, if the driving gear has 12 teeth and evolves at 60revolurion/ minute. What is the speed of the driven gear with 80 teeth?   (a)160 revolution/ minute  (b) 90 revolution/ minute  (c) 60 revolution/ minute  (d) 40 revolution/ minute

26. The following are reasons for lubricating gears  Except ___________.  (a) resist friction   (b) increase heat  (c) prevent wear  (d) protect against rust

27. An equipment may breakdown due to the following Except ___________.  (a) Lack of maintenance  (b) Bad operating method  (c) Poor installation of the equipment  (d) Regular maintenance

28. In a gear drive, if the driving gear has 30 teeth and revolves at 120rev/ min, how many teeth has the driven gear that revolves at 90 rev/ min?  (a) 30  (b) 40  (c) 60  (d) 180

29. The tool used for taking out nails in the wood is _________.  (a) gouge  (b) pincer  (c)  hammer  (d) pliers

30. A plane is a woodwork tool used for __________.  (a) cutting  (b) camping  (c) joining  (d) smoothing

31. Pneumatic system is applied in the following Except _________.  (a) Sewing machine  (b) Tyre bay equipment  (c) Dentist’s drill  (d) Pipe organ

32. The system that slows down when leakage occurs is the _________.  (a) Pneumatic system  (b) Hydraulic system  (c) Gear system  (d) Belt system

33. Which of the following is needed for lifting heavier loads?  (a) Pneumatic system  (b) Hydraulic system  (c) Pump system  (d) Belt system

34. Which of the following is Not  a component of hydraulic machine?  (a) Actuator  (b) Reservoir  (c) Compressor  (d) Control valve

35. Gear, belt and chain drives are used for the following Except __________.  (a) Changing direction  (b) Transmitting power   (c) Producing speed  (d) Connecting two parts together

36. __________ is a mechanical energy transmission system of transmitting power with the use of toothed edges wheel that mesh with one another.  (a) Gear drive  (b) Chain drive  (c) Belt drive  (d) Electric movers

37. The following are categories of gears Except __________.  (a) Parallel axes  (b) Non- parallel axes   (c) Perpendicular axes  (d) Intersecting axes

38. The types of gear introduced when gears need to move in the same direction is known as ___________.  (a) Driver  (b) Pulley  (c) Sprocket  (d) Idler

39. Chain drives are used in the following machines Except __________.  (a) Sewing machine  (b) Bicycles  (c) Motorcycles  (d) Conveyors

40. The device used for converting fluid power into mechanical power to do useful work is known as _________.  (a) Filter  (b) Reservoir  (c) Compressor  (d) Actuator

 

Section B : Theory

Answer any two questions from this section.

1a. Define Friction

1b. Give two advantages and two disadvantages of friction

1c. Explain the methods of reducing friction

2a. Define the following :

i.) Belt drives

ii. ) chain drives.

2b. Give three examples of each machine that uses belt and chain drive

2c. Mention two examples of each:

i. Belt drive : ________________,  ______________

ii. Chain drive : ______________, ______________

3a. Define pressure and state it unit

3b. With the aid of a neat sketch, describe a force pump.

3c. A pressure of 100N/m² acts on a piston of 5m². Calculate the force extended on the piston