問題一覧
1
Which of the following is recovered by simple process of heating highly crushed ore.
Native copper
2
What's number 5 in Mohs circle?
Apatite
3
When a column is subjected to an eccentric load, the stress induced in the column will be _______
Both direct and bending stress
4
A hand tool which is commonly used for cutting or twisting wire and chipping small parts and not to be used for tightening or loosening bolts and nuts.
Pliers
5
Flux is used in soldering to
Prevent formation of oxides
6
It is a process of welding by local fusion with or without the use of a filler. It is the further developed way of welding and was used in building ships in the world War 1
Fusion welding
7
It is an age harden able wrought alloy which has mechanical properties comparable to those of heat treated alloy steel of the same order of hardness and resistance to corrosion similar to that of monel. What is this alloy of nickel
K monel
8
Before starting the brazing process, cleaning of parts is necessary to avoid which of the following?
Corrosion
9
In arc welding, the temperature of the arc is
Above 3500C
10
It is a device that opposes motion and dissipates energy. An example of which is automobile shock absorber
Dashpot
11
______ is polymer of chloroprene of the monovinly acetylene type
Neoprene
12
In sulfuric acid, which of the following is suitable for handling acid in concentrations up to 50% and at a temperature including the boiling point?
Hastelloy A
13
The working temperature range for soldering process is
180 to 250 C
14
A milling machine operation which is machining two opposite sides of the metal at the same time
Straddle milling
15
Forging possesses the following disadvantage
Cast iron components can be forged
16
Electrical conductor grade aluminum consist of approximately what percent of aluminum?
99.45%
17
Most of the non recycled aluminum produced today is produced electrochemical. What do you call this process?
Bayer process
18
Along with chromium and vanadium the main constituent of high speed steel is which of the following?
Tungsten
19
Mechanical impact devices that accept material smaller than approximately 4 inches
Fine impact mills
20
Which of the following is an example of accelerated strain aging in steel?
Blue brittleness
21
In welding, weld spelter means
Electrode coating
22
Which of the following is a unique form of cast iron with worm-shaped graphite particles?
Compacted graphitic iron
23
A type of welding which is an arc welding process which produces a uniting of metals by heating them with an arc between a tungsten (non-consumable) electrode and the work piece. Shielding of the weld area is obtained from a gas usually argon or helium
Gas tungsten arc welding
24
In steels that have been deoxidized with aluminum (eg medium carbon and alloy steels) no grain growth occurs until the _______ is reached, which is well above critical temperature
Coarsening temperature
25
Which of the following device is used for transmitting energy in CNC machine tools?
Recirculating ball screw nut assembly
26
Spelter is another name for
Zinc
27
Which of the following consists of a number of parallel strands of fiber, the strands are side by side (not interwoven or twisted together), forming a flat ribbon
Roving
28
One of the three basic ways of using a file which is performed by grasping the file at the end and pushing and drawing across the workpiece
Draw filing
29
Is an acceleration parameter (with units of gravities) that depends on the natural frequency and the change in velocity due to shock
Shock transmission
30
An overload condition that occurs near large concentrated load
Local buckling
31
Why are Plasticizers added to plastics?
To increase flexibility of materials
32
Borax is applied to parts to be brazed in order to
Dissolve oxides and form strong joint when work is heated
33
Which of the following has 40% to 60% copper, the rest nickel, with high electrical resistance and is used in thermocouples
Constantan
34
A place in metal parts are cut to the size required and put together to form mechanical units of machines, the machine so made to be used directly or indirectly in the production of the necessities and luxuries of civilization
Machine shop
35
Flux is used in soldering to
Prevent formation of oxides
36
Degrees of polymerization for commercial plastics are usually less than
1000
37
The commonly used gases in tungsten arc welding are
Helium and argon
38
Y-alloy is an alloy of aluminum and which of the following metals?
Copper
39
A type of pliers which is used for cutting wires and holding flat round stock
Slip joint combination pliers or mechanical pliers
40
Which of the ff is the ratio of the fatigue strength without a stress concentration to the fatigue stress with a stress concentration?
Fatigue stress concentration factor
41
Which of the following is a finishing process?
Sintering
42
sino tong qpal na ito?
Chino santos