competence 8.1

45問 • 1年前

問題一覧

1. When drilling blind holes with standard drill press, the proper method of stopping the progress of the drill boring through the work is by_

•using a depth stop

2. What is the end of shaft condition before the maintenance repair is carried out?

•chamfered

3. Why should two pipe joints be properly aligned before being connected?

•Misalignment of the joints will result to excessive strain.

4. What precaution should be followed when using a chisel having a mushroom head?

•Removed the ragged edges by grinding

5. The blade for a power hacksaw should be installed with the teeth:

•pointing toward the motor end of the machine

6. Which of the following types of files would produce a fine finish when draw filing?

•Mill cut

7. Which of the following hand taps are recommended in cutting internal threads on a blind hole?

•Pilot and Intermediate

8. Which of the followwing indicator is used to determine the hardness of a grease?

•Penetration number

9. Knowing the construction and the operating action of the milling machine will lessen the chance of the machine from being

•damaged serously.

10. Diesel engine piston ring ends can be machined in different shapes. The step-cut ring end offers the advantage of:

•a decreased possibility of ring seizure

11. Hacksaw cutting is more effective when pressure is applied on the ?

•foreward stroke

12. A follower rest should make use of a lathe to machine.

•threads on long slender shafts

13. Which of the files listed is commonly referred to as a "rat-tail"file?

•Small round

14. When drilling hole in a piece of work chuked in a lathe you should mount the drill chunk in the_

•tailstock

15. What should you do when using a chisel with a mushroom head?

•Remove the ragged edges by grinding.

16. What is the theoretical lift of a pump handling fresh water at atmospheric pressure?

•10.35 m

17. The lower water seal on a diesel engine wet cylinder liner must allow for liner expansion and contraction. This seal is most commonly a

•neoprene o-ring

18. What is the complete process when copper plates are used for making gaskets that is usually annealed by heating red cherry color?

•Cooling slowly in air

19. What is this kind of metal which is light, strong and corrosion -resistant used as the plate material in plate-type heat exchanger ?

•titanium

20. Which of the files listed will have coarsely spaced teeth?

•Bastard cut

21. How do you call a welding process with the work in the positive pole and the electrode in the negative pole?

•Straight polarity welding circuit

22. When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by.

•renewing both driving and driven gears as a set

23. Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?

•Replaceable impeller and casing wearing rings

24. What hand tool is commonly used in drilling, reaming, hand tapping, and die threading processes?

•Vise grip

25. What type of tooth set on a hacksaw blade where every third tooth remains straight, while the other two are alternately set?

•Rake

26. What operation is used in smoothing and squaring the surface of a round hole ?

•counterboring operation

27. How do you make it easier for a hand hacksaw to cut a work piece?

•it will dig into the work piece and tend to whirl around

28. What is the primary used of a soft faced hammer or mallet?

•For striking a surface without causing damage

29. When repacking a stuffing box fitted with a lantern ring, which of the following precautions should be observed?

•Replace all the packing rings

30. A micrometer screw has a pitch of?

•50 thread per inch

31. When using centre lathe, why should you short sleeves or close fitting sleeves be worn?

•to prevent sleeves being caught up on work piece or chuck

32. Before using an all-purpose electric measuring instrument (multimeter) utilizing internal batteries to supply power for resistance measurements, you should first

•select the proper resistance range,

33. A centrifugal pump vibrates excessively during operation, Upon dissasembling the pump it is found that the impeller is out of balance. Without an available spare, you should

•remove metal from the heavy side by machining in a lathe

34. What metal is used as an alloying material in the manufacture of varius special steels ?

•vanadium

35. The term refering to the number of teeth per inch on a hacksaw blade is known as the ?

•pitch

36. After removing an old set of of rings, which of the following conditions is indicated if a bright spot is found on each end of a broken piston ring?

•insufficient gap clearance

37. Stainless steel is an alloy composed mainly of ?

•chronium and steel

38. What size circular bar is required to make a hexagonal nut of 16mm sides along the:

•16 mm

39. What is the ultimate stress of mild steel used in boiler plates?

•30 tons/sq.m

40. What is the purpose of annealing the steel?

•to make it softerr

41. This method is used for joining sheet metal and for attaching studs, rods and busses, etc. to plates.

•Resistance welding

42. Monel metal is an alloy composed mainly of ?

•nickel and copper

43. When replacing packing rings in the stuffing boxes of reciprocating pump piston rods, the ends of the rings should be cut ?

•square

44. Which of the listed numeric values represents the smallest size drill?

•#80

45. Temporary repairs to an open DC propulsion armature coilcan be made by .

•disconnecting coil ends, insulating each, and short circuiting the two commutator bars

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