MD ELEMENTS TEST 13

D. stainless steels

The phenomenon of "weld decay" is associated with:
A. brass
B. manganese steels
C. aluminum alloys
D. stainless steels

A. mulberry

Which of the following timber is used for sports goods?
A. mulberry
B. mahogany
C. sal
D. deodar

B. Pyramidal form

A knoop indenter is a diamond ground to a:
A. Prismoidal form
B. Pyramidal form
C. Cylindrical form
D. Needle form

B. injection moulding

The process commonly for thermoplastic materials is:
A. die-casting
B. injection moulding
C. shell moulding
D. cold forming

D. carbon

The most important element that controls the physical properties of steel is:
A. silicon
B. manganese
C. tungsten
D. carbon

A. dislocation

The imperfection in the crystal structure of metal is known as:
A. dislocation
B. slip
C. fracture
D. impurity

D. thermosetting plastics

Polyesters belong to the group of:
A. thermoplastic plastics
B. phenolics
C. all of the above
D. thermosetting plastics

D. to increase strength and ductility

The effect of alloying zinc to copper is:
A. to increase hardness
B. to impart free-machining properties
C. to improve hardness and strength
D. to increase strength and ductility

B. multi spot welding process

Projection welding is:
A. continuous spot welding process
B. multi spot welding process
C. used to form
D. used to make mesh

C. after the weld cools

In resistance welding, the pressure is released:
A. just at the time of passing the current
B. during heating period
C. after the weld cools
D. after the completion of currents

D. oxy-acetylene

Grey cast iron is best welded by:
A. MIG
B. submerged arc
C. TIG
D. oxy-acetylene

D. screw threads

A plug gauge is used to measure
A. taper bores
B. cylindrical bores
C. spherical holes
D. screw threads

D. aluminum

Choose the one that will have the highest cutting speed:
A. cast iron
B. tool steel
C. brass
D. aluminum

D. magnetic chuck

When large number of components are turned and parted off from a bar, the chuck generally used is:
A. four jaw chuck
B. two jaw chuck
C. collet chuck
D. magnetic chuck

A. gear tooth profile

Gear tooth vernier is used for measuring:
A. gear tooth profile
B. module
C. pitch line thickness of gear tooth
D. gear tooth thickness

C. cutting form the base of a work piece

A. an operation of cutting extreme deep groove
B. an operation of cutting a groove next to a shoulder on a piece of work
C. cutting form the base of a work piece
D. an operation of cutting extreme wide threads

D. electronic industry

Laser welding is widely used in:
A. Process industry
B. structural work
C. heavy industry
D. electronic industry

A. control of pressure and current

Unlike materials or materials of different thickness can be butt welded by:
A. control of pressure and current
B. adjusting time duration of current
C. adjusting initial gap
D. all of the above

C. size of the electrode

In arc welding operations the current value is decided by:
A. thickness of plate
B. voltage across the plate
C. size of the electrode
D. length of welded portion

D. welding stainless steel

Arc blow takes place in:
A. gas welding
B. arc welding when straight polarity is used
C. arc welding when reverse polarity is used
D. welding stainless steel

C. 11%

For a completely corrosion-resistant stainless steel, what minimum percentage of chromium in the alloy is required?
A. 3.2%
B. 7.3%
C. 11%
D. 15%

D. a measuring tool

What for is a rammer used?
A. a tool used in welding for cleaning purpose
B. a tool used in press work to lift the pressure components
C. a tool used in foundry to pack the sank in mould
D. a measuring tool

D. a tool used in foundry for repairing the mould

What for is a swab used?
A. a tool used on shaper
B. a tool used in foundry for moistening the sand
C. the tool used in foundry for smoothening the mould
D. a tool used in foundry for repairing the mould

C. a tool used in foundry for cleaning of castings

What for is a gagger used?
A. a tool used in clearing welds
B. a tool used in clearing material before welding
C. a tool used in foundry for cleaning of castings
D. a shaped metal accessory

D. Used in foundry for smoothening and cleaning out depression in the mould.

What for are bellows used?
A. Used in foundry in moistening the mould
B. Used in foundry for cleaning of castings
C. Used in foundry for blowing loose sand
D. Used in foundry for smoothening and cleaning out depression in the mould.

A. capacity to hold moisture

Permeability of a foundry sand is:
A. capacity to hold moisture
B. porosity to allow the escape of gases
C. distribution of binder in sand
D. fineness of sand

D. large scale production of castings

What for arc metal patterns used?
A. precision castings
B. small castings
C. large castings
D. large scale production of castings

C. moulding sand characteristics

An important factor to be considered while designing a core print is:
A. pattern material
B. type of mould
C. moulding sand characteristics
D. pouring temperature

C. all of the above

Which of the following metals can be suitably welded by TIG welding?
A. aluminum
B. magnesium
C. all of the above
D. stainless steel

D. welding defect

Weld spatter refers to:
A. welding electrode
B. filler material
C. shield
D. welding defect

A. a tool used in mould repairing

A sprue is:
A. a tool used in mould repairing
B. a process of cleaning castings
C. a chemical that is added to molten materials for sound castings
D. a vertical passage through the cope

D. a vent hole to allow for the hot gases to escape

What is a gate?
A. a passage through which metal is poured into the mould
B. a passage through which metal rises when the mould is filled
C. a passage that finally leads molten metal from the runner into the mould cavity
D. a vent hole to allow for the hot gases to escape

C. to form seat to support and hold the core

What for are core prints provided?
A. to form trade marks of company on castings
B. to produce castings with specific surface design
C. to form seat to support and hold the core
D. to direct the flow of molten material during pouring

D. centrifugal blower

The equipment that is used in pit for supply of air is known as:
A. fan
B. hand blower
C. air cylinder
D. centrifugal blower

A. clean the surface of small parts

Tumbling is done so as to:
A. clean the surface of small parts
B. stress reliever the components
C. get surface finish
D. to plate the surface

D. to modify the structure and properties of a cast metal

The purpose of inoculation is:
A. To clean the casting
B. to decrease the melting temperature of a cast metal
C. to change the chemical composition of a cast metal
D. to modify the structure and properties of a cast metal

C. white cast iron

Least shrinkage allowance is provided in the case of which of the following?
A. brass
B. cast iron
C. white cast iron
D. aluminum

C. less

The draft allowance on metallic pattern as compared to wooden one is:
A. more
B. same
C. less
D. more or less depending on size

D. angle iron

Select one that is not an angle measuring device.
A. bevel protector
B. sine bar
C. combination square
D. angle iron

C. fineness

Dilatometer is used to find out which property of moulding sand?
A. permeability
B. hot strength
C. fineness
D. moisture content

D. copper

The mould for casting ferrous materials in continuous casting process is made of:
A. low carbon steel
B. high carbon steel
C. medium carbon steel
D. copper

D. flow of liquids and gases

What is rotameter used?
A. rpm of engines
B. rotation of shafts
C. twist due to torque applied on shafts
D. flow of liquids and gases

C. high

The impedance of piezo-electric crystals is:
A. negligible
B. low
C. high
D. very low

B. measuring velocity of air stream

Hot wire anemometers are generally for:
A. measuring pressure of fluids
B. measuring velocity of air stream
C. measuring temperature of moving fluid
D. measuring thermal conductivity of solids

C. gravity casting

Ornaments are cast by:
A. die casting
B. pressed casting
C. gravity casting
D. continuous casting

B. a fine spray of metal

During MIG welding the metal is transformed in the form of:
A. continuous flow of molten metal
B. a fine spray of metal
C. solution
D. electron beam

D. Laser welding

A collimated light beam is used for producing heat in:
A. MIG welding
B. TIG welding
C. Plasma welding
D. Laser welding

C. connecting load pipes by soldering alloy

Wipping is the process of:
A. cleaning the welded surface after the welding operation is over
B. applying flux during welding process
C. connecting load pipes by soldering alloy
D. low temperature welding

D. Water jet machining

In which of the following process hydraulic fluid acts as transfer media?
A. Electron beam machining
B. Electro-discharge machining
C. Iron beam machining
D. Water jet machining

B. uniform symmetrical shape

Sweep pattern is used for moulding parts having
A. rectangular shape
B. uniform symmetrical shape
C. complicated shape having intricate details
D. none of the above

D. the formation of oxides on the molten metal surface

Drossing
A. a method of cleaning the castings
B. an inspection of method for castings
C. a method of deoxidation of molten metal
D. the formation of oxides on the molten metal surface

C. 30°

The usual value of helix angle of a drill is:
A. 110°
B. 120°
C. 30°
D. 60°

D. shank, material and diameter

A twist drill is specified by:
A. its diameter and lip angle
B. its shank and diameter
C. shank, material and flute size
D. shank, material and diameter

C. semi-skilled operators can be employed

Broaching operation is generally used in automobile industry as:
A. it is an automatic machine
B. it is a mass production machine
C. semi-skilled operators can be employed
D. operations is completed in one stroke

A. gear shaving

Select the one that is gear finishing process:
A. gear shaving
B. gear shaping
C. gear hobbing
D. gear milling

C. all of the above

Formed milling operation of cutting gears can be used for cutting which type of gears?
A. spur
B. worm
C. all of the above
D. bevel

D. 90 - 180 m/min

Water should be run at a speed of
A. 70 - 90 m/min
B. 40 to 120 m/min
C. 300 m/min
D. 90 - 180 m/min

A. milling machine

A machine tool in which metal is removed by means of a revolving cutter with many teeth, each tooth having a cutting edge which removes its share of the stock.
A. milling machine
B. lathe
C. drill
D. grinder

C. brazing

Welding operation in which a non-ferrous filler metal melts at a temperature below that of the metal joined but is heated above 450°C.
A. fillet weld
B. soldering
C. brazing
D. TIG welding

B. Knurling

The process of checking or producing checkers on the surface of a piece by rolling checkered depressions into the surface.
A. Indexing
B. Knurling
C. Quenching
D. Soldering

A. annealing

Steels can be strengthened all of the following, EXCEPT:
A. annealing
B. quenching and tempering
C. work hardening
D. age precipitation

B. a measure of the material's ability to store strain energy

Modulus of resilience is:
A. the same as the modulus of elasticity
B. a measure of the material's ability to store strain energy
C. reciprocal of modulus of elasticity
D. measure of the deflection of a member

C. 0%

Percentage reduction of area while performing tensile test on cast iron may be of the other of:
A. 50%
B. 25%
C. 0%
D. 15%

D. all of the above

Belt slip may take place because of:
A. loose load
B. driving pulley too small
C. heavy belt
D. all of the above

C. involute

The curve that is generally used as the profile of gear teeth:
A. hypoid
B. epicycloid
C. involute
D. cycloid

A. 30 to 50

In roller chain drive, the center-to-center distance between the sprockets, as a general rule, should be between ________ times the pitch.
A. 30 to 50
B. 45 to 65
C. 60 to 80
D. 75 to 95

B. the bearing encloses less than 360 deg of the journal

A partial bearing is one in which:
A. the bearing is supplied with less oil than full bearing
B. the bearing encloses less than 360 deg of the journal
C. the bearing is slightly loaded
D. the bearing is supplied with oil intermittently

A. 10 to 15 deg

Aluminum has a rake angle of ________.
A. 10 to 15 deg
B. 12 to 18 deg
C. 14 to 20 deg
D. 16 to 22 deg

A. ½

In general the length of engagement is more than _______ times the nominal diameter a 50 to 55 percent thread is satisfactory.
A. ½
B. ¾
C. 4/5
D. 2

A. Reaming

Is recommended for the larger thread diameters and for some fine pitch threads.
A. Reaming
B. Piercing
C. Hobing
D. none of these

D. electro-discharge machine

Broken tap can be removed by ________.
A. chamfering
B. deleting
C. damaging
D. electro-discharge machine

B. bevel gear

Are conical gears, that is, gears in the shape of cones, and are used to connect shafts having intersecting axes.
A. helical gear
B. bevel gear
C. spur gear
D. worm gear

A. curve tooth type

Bevel gears may be classified as being either of the straight-tooth type or the _________.
A. curve tooth type
B. helical tooth type
C. square tooth type
D. none of these

C. zerol bevel gears

The teeth of gears are curved but lie in the same general direction as the teeth of straight bevel gears.
A. straight bevel gears
B. worm gears
C. zerol bevel gears
D. helical gears

D. hypoid gear

Is the same as spiral gears, except that the axis of the pinion is offset relative to the gear axis.
A. bevel gears
B. trochoid gears
C. ratchet gear
D. hypoid gear

B. 1000 fpm

Zerol bevel gears for maximum smoothness and quietness should be run at _______.
A. 900 fpm
B. 1000 fpm
C. 1200 fpm
D. 1400 fpm

C. 8000 fpm

For peripheral speeds above _______, ground gears should be used.
A. 6000 fpm
B. 7000 fpm
C. 8000 fpm
D. 9000 fpm

A. 1000 fpm

Spiral bevel and hypoid gears are recommended for applications where peripheral speeds exceed ________.
A. 1000 fpm
B. 1200 fpm
C. 1300 fpm
D. 1400 fpm

D. all of these

Hypoid gears are recommended for industrial applications:
A. when maximum smoothness of operation is desired
B. for high reduction ratios where compactness of design, smoothness of operation, and maximum strength are important.
C. for non-intersecting shafts
D. all of these

C. A and B

________ gears may be used for both speed-reduction and speed-increasing drives.
A. bevel gears
B. hypoid gears
C. A and B
D. worm gears

B. whole depth of tooth

As a general rule, the amount of metal under the root should be equal to the _______.
A. partial depth of tooth
B. whole depth of tooth
C. twice the tooth
D. thrice the tooth

B. 1/3

On webless type ring gears, the minimum stock between the root line and the bottom of tap drill holes should be ______ of the tooth deep.
A. ½
B. 1/3
C. ¼
D. 3/4

B. oil tight

Spiral bevel and hypoid gears should, in general, be mounted on anti-friction bearings in an ______ case.
A. water tight
B. oil tight
C. soluble tight
D. rubber tight

B. 80%

For both straddle mounted and overhung mounted gears the spread between bearings should never be less than ______ of the pitch diameter of the gear.
A. 70%
B. 80%
C. 90%
D. 100%

B. 2 ½ times

On overhung mounted gears the spread should be at least ______ the overhung.
A. ½ times
B. 2 ½ times
C. 3 times
D. 4 times

D. 20 deg

The basic pressure angle of bevel gears is ______.
A. 5 deg
B. 10 deg
C. 15 deg
D. 20 deg

C. 16 or more

For basic pressure angle of 20 degrees, the number of teeth for no undercut are ______ teeth in the pinion.
A. 14 or more
B. 15 or more
C. 16 or more
D. 17 or more

B. 35 deg

Spiral angle of spiral bevel gears is ______.
A. 30 deg
B. 35 deg
C. 40 deg
D. 45 deg

C. 0.006 in

To assure successful operation, bevel gears must be rigidly mounted within the housing such that the deflection of one gear relative to the other does not exceed ______ either axially or tangential to the pitch diameters.
A. 0.004 in
B. 0.005 in
C. 0.006 in
D. 0.007 in

A. 45 deg

In general, the same tooth proportions used for Gleasons System spiral bevel gears may be used for spiral bevel gears with spiral angle of from, say, 20 to ______.
A. 45 deg
B. 60 deg
C. 14.5 deg
D. 90 deg

A. clockwise direction

The direction of rotation of a bevel gear is determined as ______.
A. clockwise direction
B. counter clockwise
C. opposite direction
D. the same direction

C. 1.25

Spiral angle should be selected to give a face contact ratio of ______ to assure smooth tooth action and quiet gears.
A. 1.10
B. 1.20
C. 1.25
D. 1.30

B. tooth surface

The axial thrust load produced on the bearings of a bevel gear is equal to the axial component of the normal load on the ______.
A. tooth thickness
B. tooth surface
C. tooth angle
D. none of these

D. steel

The material most commonly used in the manufacture of bevel gears is
A. alloy
B. stainless
C. wrought iron
D. steel

D. 12-tooth

There are 8 cutters in the series for each diametral pitch to cover the full range from ______ pinion to a crown gear.
A. 18-tooth
B. 16-tooth
C. 14-tooth
D. 12-tooth

B. 2000 fpm

Class A Bevel gears - Precision gears recommended for peripheral speeds above ______.
A. 1000 fpm
B. 2000 fpm
C. 3000 fpm
D. 4000 fpm

B. 3 times

The face width should not normally exceed one-third of the pitch cone distance or ______ the pitch.
A. 2 times
B. 3 times
C. 4 times
D. 5 times

C. 20 degrees

Pressure angle of worm gears is ______.
A. 10 degrees
B. 15 degrees
C. 20 degrees
D. 25 degrees

B. 2 inch

The minimum recommended worm pitch diameter is 0.25 inch and the maximum is ______.
A. 1 inch
B. 2 inch
C. 3 inch
D. 4 inch

C. 40 deg

The shape of the worm thread in the normal plane is defined as that which is produced by a symmetrical double-conical cutter or grinding wheel having a straight elements and an included angle of ______.
A. 30 deg
B. 35 deg
C. 40 deg
D. 45 deg