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MD ELEMENTS PER 50 > E5_1-50 > Flashcards

E5_1-50 Flashcards

1
Q
  1. The process of increasing the carbon content to surface of steel by exposing it to hot carbonaceous material above the transformation of 1650 to 17500F.

A. Carbonitriding
B. Case hardening
C. Carburing
D. Induction hardening

A

C. Carburing

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2
Q
  1. In the SAE identification code of steel shafting the 3rd and 4th digits represents the content of:

A. % of manganese in the steel
B. % of alloy
C. % of carbon content
D. % of chromium in the steel

A

C. % of carbon content

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3
Q
  1. It is associated with nickel steel.

A. Magensium
B. Lead
C. Columbium
D. Tin

A

D. Tin

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4
Q
  1. A non-magnetic metal is:

A. Nodular iron
B. Manganese steel
C. Tungsten – molybdenum steel
D. All of these

A

B. Manganese steel

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5
Q
  1. In small quantity this alloy is effective for improvement strength at high temperature.

A. Chromium
B. Manganese
C. Selenium
D. Molybdenum

A

A. Chromium

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6
Q
  1. T of carbon and alloy used in production of precision work tools.

A. Chrome – manganese
B. Titanium
C. High speed steel
D. Chrome – molybdenum

A

C. High speed steel

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7
Q
  1. Powder metallurgy, the process of heating the cold pressed metal powder is called:

A. Deposition
B. Granulation
C. Precipitation
D. Sintering

A

D. Sintering

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8
Q
  1. Electro-forming is especially valuable for:

A. Decorative items
B. Good conductors of electricity
C. Non-ferrous components
D. Thin walled parts requiring a high order of accuracy and internal surface finish

A

D. Thin walled parts requiring a high order of accuracy and internal surface finish

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9
Q
  1. Aluminum alloys for pressure die casting.

A. Must possess considerable fluidity
B. Must not be free from hot shortness
C. Must have iron as one of the constituents
D. Must be light

A

A. Must possess considerable fluidity

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10
Q
  1. In carbon steel castings.

A. The percentage for alloying elements is controlled
B. The percentage of carbon is between 1.7% to 2%
C. The percentage of carbon is less than 1.7%
D. None of the above

A

C. The percentage of carbon is less than 1.7%

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11
Q
  1. The minimum value of numerical combined shock and fatigue factor to be applied in every case to the computed bending moment of the shaft is:

A. 2.0
B. 1.75
C. 1.5
D. 1.3

A

C. 1.5

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12
Q
  1. What is the other name given to short shafts on machines?

A. Spindles
B. Head shafts
C. Cores shafts
D. All of these

A

A. Spindles

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13
Q
  1. The other name given to a line shaft is:

A. Countershaft
B. Main shaft
C. Long shaft
D. Head shaft

A

B. Main shaft

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14
Q
  1. The speed at which the center of mass will be equal the deflecting forces on the shaft, the shaft with its attached bodies will then vibrate violently, since the centrifugal force changes its direction as the shaft turns in.

A. Nominal speed
B. Critical speed
C. Relative speed
D. Mean speed

A

B. Critical speed

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15
Q
  1. An old rule of thumb for transmission shafting is that the deflection should not exceed ____ of length between supports.

A. 0.01 in. per foot
B. 0.08 in. per foot
C. 0.02 in. per foot
D. 0.05 in. per foot

A

A. 0.01 in. per foot

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16
Q
  1. For transmission shafts, the allowable deflection is 1 degree in a length of ____ diameters.

A. 20
B. 25
C. 30
D. 40

A

A. 20

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17
Q
  1. What is the limiting torsional deflection for machinery shafts. If the criteria of limiting torsional deflection vary from 0.080 per foot of length.

A. 10
B. 2.50
C. 20
D. 3.50

A

A. 10

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18
Q
  1. Bevel gears of sizes 5 in. to 15 in. should not be lift or depress more than _____ as Gleason statement.

A. 0.004
B. 0.003
C. 0.002
D. 0.001

A

B. 0.003

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19
Q
  1. What type of key that allows the hub to move along the shaft but prevents the rotation of the
    shaft?

A. Woodruf key
B. Feather key
C. Gibbs key
D. Square key

A

B. Feather key

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20
Q
  1. What is the other name for Kennedy key?

A. Tangential key
B. Woodruf key
C. Saddle key
D. Rollpin

A

A. Tangential key

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21
Q
  1. It has a powerful softening effect on cast iron and its pressure in cast iron reduces the ability of the iron to retain carbon in chemical combination.

A. Aluminum
B. Carbon
C. Silicon
D. Sulphur

A

C. Silicon

22
Q
  1. Cyaniding is the process of:

A. Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
B. Dipping steel in cyanide bath
C. Obtaining cyanide salts
D. Reacting steel surface with cyanide salts

A

A. Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

23
Q
  1. An engineer’s hammer is made of

A. Cast iron
B. High speed steel
C. Forged steel
D. Mild steel

A

C. Forged steel

24
Q
  1. A cold chisel is made of:

A. Cast iron
B. High carbon steel
C. High speed steel
D. Mild steel

A

B. High carbon steel

25
Q
  1. Eutectoid steel the percentage of carbon is:

A. 0.02%
B. 0.30%
C. 0.63%
D. 0.80%

A

D. 0.80%

26
Q
  1. Machining properties of steel can be improved by adding:

A. Chromium, nickel
B. Silicon, aluminum, titanium
C. Sulfur, lead, phosphorus
D. Vanadium, aluminum

A

C. Sulfur, lead, phosphorus

27
Q
  1. The ability of a material to absorb energy when deformed elastically and to return it when unloaded is known as:

A. Creep
B. Fatigue strength
C. Hardness
D. Resilience

A

D. Resilience

28
Q
  1. A ductile fracture is characterized by

A. Appreciable plastic deformation prior to propagation of crack
B. Fragmentation into more than two pieces
C. Negligible deformation
D. Rapid rate for crack propagation

A

A. Appreciable plastic deformation prior to propagation of crack

29
Q
  1. Of metals where in strength of metal is increased and the ductility increases the heating at a relatively low temperature after cold working.

A. Cluster
B. Screw dislocation
C. Solid solution hardening
D. Strain aging

A

D. Strain aging

30
Q
  1. The material recovers its original dimensions, when the load is removed, it is called:

A. Annealed
B. Brittle
C. Elastic
D. Plastic

A

C. Elastic

31
Q
  1. What type of fits used for involute spline?

A. Close fit
B. Press fit
C. Sliding fit
D. All of these

A

D. All of these

32
Q
  1. It is used for permanent fits and similar to involute splines except that the pressure angle is 14.50.

A. Separation load
B. Spline shaft
C. Stub serrations
D. Involute serrations

A

D. Involute serrations

33
Q
  1. It is used a coupling, or in addition to another couplings where in case of overload, there is danger of injury to machine or to material in process.

A. Shear pin
B. Flange coupling
C. Involute serrations
D. King pin

A

A. Shear pin

34
Q
  1. What is the maximum shaft angle for a single Hooke’s coupling?

A. 100
B. 170
C. 150
D. 200

A

C. 150

35
Q
  1. What are the two principal parts of a journal bearing?

A. Bearing and journal
B. Shaft and Babbitt
C. Clearance and fitted
D. Shaft and cylinder

A

A. Bearing and journal

36
Q
  1. When the line of action of the load bisects the arc of partial bearing, the bearing is said to be:

A. Eccentrically loaded
B. Fully loaded
C. Centrally loaded
D. Partially loaded

A

C. Centrally loaded

37
Q
  1. What is the difference in radii of the bearing and journal?

A. Even clearance
B. Clearance ratio
C. Odd clearance
D. Radial clearance

A

D. Radial clearance

38
Q
  1. When radii of both the bearing and the journal are the same, then the bearing is said to be:

A. Fitted bearings
B. Clearance bearing
C. Full bearing
D. Ambiguous bearing

A

A. Fitted bearings

39
Q
  1. What is the line that passes through the centers of the bearing and the journal?

A. Line of action
B. Line of centers
C. Line of symmetry
D. Tangent line

A

B. Line of centers

40
Q
  1. Which of the following is considered advantageous for bearing materials?

A. Conformability
B. Compatibility
C. Embeddability
D. All of these

A

D. All of these

41
Q
  1. A body having identical properties all over is called:

A. Ductile
B. Elastic
C. Homogeneous
D. Isentropic

A

C. Homogeneous

42
Q
  1. Points of arrest of iron correspond to:

A. Stages at which allotropic forms change
B. Stages at which further heating does not increase temperature for sometime
C. Stages at which properties do not change with increase in temperature
D. There is nothing like points of arrest

A

A. Stages at which allotropic forms change

43
Q
  1. Delta iron occurs at:

A. Temperature above melting point
B. Temperature between 14000C and 15390C
C. Temperature between 10000C and 14000C
D. Room temperature

A

B. Temperature between 14000C and 15390C

44
Q
  1. Gamma iron exists at the temperature range.

A. Between 9100C and 14000C
B. Between 14000C and 15390C
C. Near melting point
D. Room temperature

A

A. Between 9100C and 14000C

45
Q
  1. Ferromagnetic alpha iron exists in temperature range of:

A. Below 7230C
B. 700 – 9100C
C. 1000 – 14400C
D. 1400 – 15390C

A

A. Below 7230C

46
Q
  1. The mould for casting ferrous materials in continuous melting process is made of:

A. Low carbon steel
B. Medium carbon steel
C. High carbon steel
D. Copper

A

D. Copper

47
Q
  1. A silver refers to

A. The pointed location spot silver plated
B. The point on an instrument dial a reading beyond which may be dangerous for the system
C. The temperature at which silver melts
D. The temperature of equilibrium between solid silver and liquid silver at normal atmospheric pressure

A

D. The temperature of equilibrium between solid silver and liquid silver at normal atmospheric pressure

48
Q
  1. Piston compression rings are made of

A. Aluminum
B. Bronze
C. Cast iron
D. White metal

A

C. Cast iron

49
Q
  1. One of the materials used for making surface plate is

A. Brass
B. Granite
C. Stainless steel
D. Wood

A

B. Granite

50
Q
  1. Cast iron contains _____% carbon

A. 0.05 to 0.30
B. 0.30 to 0.60
C. 0.60 to 1.30
D. 2 to 4

A

D. 2 to 4

MD ELEMENTS PER 50 (10 decks)

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