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MD ELEMENTS PER 50 v2 > E7_2 > Flashcards

E7_2 Flashcards

1
Q
  1. What pressure is required for punching a hole 2” dia thru ¼” steel plates?

A. 40 tons
B. 45 tons
C. 50 tons
D. 35 tons

A

A. 40 tons

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2
Q
  1. What is the working strength of a 2” bolt which is screwed up tightly in a packed joint when the allowable working stress is 12,000 psi.

A. 20.4 ksi
B. 23.4 ksi
C. 22.4 ksi
D. 18 ksi

A

A. 20.4 ksi

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3
Q
  1. Determine the bursting steam pressure of a steel shell with diameter of 10 inches and made of ¼” thick steel plate. The joint efficiency is at 60% and the tensile strength is 60 ksi.

A. 4200 psi
B. 42.8 ksi
C. 10.5 ksi
D. 8500 psi

A

A. 4200 psi

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4
Q
  1. Commonly used by steel melter as deoxidizer because of its easy availability and cheap price.

A. Silicon
B. Zinc
C. Aluminum
D. Manganese

A

C. Aluminum

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5
Q
  1. Curve formed by the path of a point on a straight line as it rolls along a convex base curve. The base curve is usually a circle and generally used as the profile of gear tooth.

A. Axial plane
B. Arc of recess
C. Involute
D. Arc of action

A

C. Involute

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6
Q
  1. Resultant of two or more component forces is called:

A. Composition of forces
B. Component
C. Resultant
D. Collinear of forces

A

A. Composition of forces

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7
Q
  1. A material having a high electrical resistance and should not be used for conductor of electric current.

A. Alloyed magnesium
B. Nickel
C. Silicon base alloy
D. Zinc

A

B. Nickel

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8
Q
  1. It improves red hardness of steel.

A. Silicon
B. Cobalt
C. Lead
D. Manganese

A

B. Cobalt

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9
Q
  1. Designated pipe color used in communication.

A. Silver gray
B. Bare
C. Aluminum gray
D. White

A

D. White

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10
Q
  1. The design stress and factor of safety are related in the following manner.

A. Design stress = ultimate stress/factor of safety
B. Ultimate stress = factor of safety/design stress plus concentration factor
C. Factor of safety = Design stress/ultimate stress
D. Design stress = factor of safety/times stress concentration factor

A

A. Design stress = ultimate stress/factor of safety

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11
Q
  1. The process commonly used over thermo-plastic materials is

A. Cold forming
B. Die casting
C. Injection molding
D. Shell molding

A

C. Injection molding

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12
Q
  1. A space lattice found in alpha – iron is called the

A. Body centered cubic space lattice
B. Close packed hexagonal space lattice
C. Face centered cubic space lattice
D. None of these

A

A. Body centered cubic space lattice

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13
Q
  1. A unit cell contains nine atoms is known as the

A. Body centered cubic space lattice
B. Close packed hexagonal space lattice
C. Face centered cubic space lattice
D. None of these

A

A. Body centered cubic space lattice

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14
Q
  1. A knoop indenter is a diamond ground to a ________.

A. Cylindrical form
B. Needle form
C. Prismoidal from
D. Pyramidal form

A

D. Pyramidal form

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15
Q
  1. Which of the following timber is used for sports goods?

A. Deodar
B. Mahogany
C. Mulberry
D. Sal

A

C. Mulberry

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16
Q
  1. Super conductors

A. Are non – crystalline
B. Are the purest forms of metal
C. Are the densest materials is
D. Exist at temperature below 10oK

A

D. Exist at temperature below 10oK

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17
Q
  1. Select the that has the highest specific gravity.

A. Aluminum
B. Brass
C. High carbon steel
D. Lead

A

D. Lead

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18
Q
  1. For heavy loads in aircraft bearings the material used with lead to reduce the risk of seizure is

A. Iron
B. Silver
C. Tin
D. Zinc

A

B. Silver

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19
Q
  1. Age – hardening is related with:

A. Cast iron
B. Duralumin
C. German silver
D. Stainless steel

A

B. Duralumin

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20
Q
  1. Which of the following has highest specific strength of all structural materials?

A. Chromium alloys
B. Magnesium alloys
C. Titanium alloys
D. None of these

A

C. Titanium alloys

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21
Q
  1. Not adaptable to welding due to low tensile strength and poor ductility etc.

A. Copper parts
B. Aluminum parts
C. Cast iron materials
D. Bronze parts

A

B. Aluminum parts

22
Q
  1. Bearing surface that completely surrounds the journal is also called:

A. Offset bearing
B. Centrally loaded bearing
C. Full bearing
D. Babbitt bearing

A

C. Full bearing

23
Q
  1. The purpose of lubrication is as mentioned, except:

A. To lighten the load
B. Prevent adhesion
C. Prevent corrosion/oxidation
D. Cool the moving elements

A

B. Prevent adhesion

24
Q
  1. Tools usually used in wood pattern making in foundry shop.

A. Saws and chisels
B. Knives and drills
C. Band saw
D. Drill machine

A

A. Saws and chisels

25
Q
  1. It is a plane perpendicular to the axial plane and to the pitch plane in gears the parallel axes and the plane of rotation coincides.

A. Tangent plane
B. Tranverse
C. Straight plane
D. Reference plane

A

B. Tranverse

26
Q
  1. A 36 tooth pinion with a turning speed of 300 rpm drives 120 tooth gear of 14 ½0 d involute full depth pressure angle. What would be the speed of the driven gear?

A. 1000 rpm
B. 90 rpm
C. 100 rpm
D. 140 rpm

A

B. 90 rpm

27
Q
  1. Several forces which can be combined are called:

A. Resultants
B. Components
C. Composition of forces
D. Collinear forces

A

B. Components

28
Q
  1. The surface along the fillet curves or between the fillets radius of the two adjacent teeth or a gear.

A. Bottom land
B. Fillet
C. Flank
D. Top land

A

A. Bottom land

29
Q
  1. Ideal herringbone gear helix is in the range of:

A. Bottom land
B. Fillet
C. Flank
D. Top land

A

A. Bottom land

30
Q
  1. Ideal herringbone gear helix is in the range of:

A. 30 to 45
B. 25 to 30
C. 35 to 50
D. 15 to 20

A

A. 30 to 45

31
Q
  1. Addition to lead and bismuth to aluminum will produce:

A. An improvement of casting characteristics
B. An improvement of corrosion resistance
C. One of the best known age and precipitation hardening system
D. An improvement in machinability

A

D. An improvement in machinability

32
Q
  1. Hastalloy contains:

A. Aluminum and nickel
B. Copper and aluminum
C. Nickel and copper
D. Nickel and molybdenum

A

D. Nickel and molybdenum

33
Q
  1. In compression, a prism of brittle material will break.

A. By forming a bulge
B. By shearing along oblique plane
C. In a direction along at the direction of load
D. Into large number of piece

A

B. By shearing along oblique plane

34
Q
  1. The maximum hardenability of any steel depends on _______.

A. The alloying elements present
B. The carbon content
C. The chemical composition
D. The grain size

A

B. The carbon content

35
Q
  1. Steel with 0.80% carbon and 100% pearlite is known as

A. Austenite
B. Eutectoid
C. Hyper – Eutectoid
D. Solidous

A

B. Eutectoid

36
Q
  1. Substance that can increase the machinability of steel

A. Phosphorous
B. Phosphorous and aluminum
C. Silicon and sulfur
D. Sulfur graphite and aluminum

A

A. Phosphorous

37
Q
  1. Compressive strength of gray cast iron in tons per cm2 is of the order of:

A. 3 – 5
B. 5 – 7
C. 7 – 10
D. 15 – 22

A

B. 5 – 7

38
Q
  1. The presence of sulphur in pig iron makes ______.

A. It brittle
B. It easily machinable
C. It hard
D. The casting unsound

A

D. The casting unsound

39
Q
  1. The hardness of steel increase it contains ______.

A. Austenite
B. Pearlite
C. Stalactite
D. Martensite

A

D. Martensite

40
Q
  1. Which one is different from the group?

A. Cyaniding
B. Nitriding
C. Flame hardening
D. Electroplating

A

D. Electroplating

41
Q
  1. A three extension coil spring are hooked in series that support a single weight of 1000 kgs. The first spring is rated at 0.400 kg/mm and the other 2 lower spring is rated at .64 kg/in. Compute the total deflection.

A. 263 mm
B. 156 mm
C. 268 mm
D. None of these

A

D. None of these

42
Q
  1. The lack of backlash in a spur gear design/operation may result to:

A. Overloading
B. All of these
C. Jamming
D. Overheating

A

B. All of these

43
Q
  1. The distance from a point on a screw thread to a corresponding point on the next thread measure along the axis.

A. Flank
B. Crest
C. Lead
D. Pitch

A

D. Pitch

44
Q
  1. As recommended the center to center distance between a sprockets should not be less than ____ times the bigger sprocket.

A. 2.216
B. 1 ½
C. 1 ¾
D. 2.59

A

B. 1 ½

45
Q
  1. Machine shop instrument for checking the flatness of plane surface to 10ths of thousandths of a centimeter.

A. Blade type micrometer
B. Planimeter
C. Dial caliper
D. Micrometer

A

B. Planimeter

46
Q
  1. Molybdenum steel standard designation SAE.

A. 88xx
B. 40 xx
C. 48xx
D. 46xx

A

B. 40 xx

47
Q
  1. Also called eccentrically loaded bearing is:

A. Full bearings
B. Partial bearings
C. Offset bearings
D. Fitted bearings

A

C. Offset bearings

48
Q
  1. In the selection of wire rope, regular lay means wires and strands are arranged in the following manner.

A. Twisted in the same direction
B. Twisted in opposite direction
C. Twisted in any direction
D. Twisted in along direction

A

B. Twisted in opposite direction

49
Q
  1. In involute teeth, the pressure angle is often defined as the angle between the line of action and the line of tangent to the pitch circle. It is also termed as:

A. Helix angle
B. Angle of obliquity
C. Angle of recess
D. Arc of action

A

B. Angle of obliquity

50
Q
  1. Instantaneous center is also called:

A. Centro
B. Virtual center
C. Rotopole
D. All of these

A

B. Virtual center

MD ELEMENTS PER 50 v2 (10 decks)

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