MD ELEMENTS 4

1. The hardness of steel increases if it contains:
   a. Martensite
   b. Pearlite
   c. Austenite
   d. All of the above

A. Martensite

2. How do you call steel with 0.8% carbon and 100% pearlite?
   a. Austenite
   b. Solidus
   c. hyper-eutectoid
   d. eutectoid

D. Eutectoid

3. What is the range of the tensile strength of common varieties of cast iron?
   a. 40-60 Mpa
   b. 150-180 Mpa
   c. 840-1500 Mpa
   d. 1500-1650 Mpa

C. 840-1500 Mpa

4. Fatigue failure occurs when a part is subjected to:
   a. Compressive stress
   b. tensile stress
   c. torsional stress
   d. fluctuating stress

D. Fluctuating stress

5. Paramagnetic alpha iron changes to gamma iron at what temperature?
   a. 440°C
   b. 910°C
   c. 70°C
   d. 1639°C

B. 910°C

6. The diameter of the washer is generally:
   a. Equal to the diameter of the bolt
   b. Slightly more than the diameter of the bolt
   c. Slightly less than the diameter of the bolt
   d. Of any size that suits the application

B. Slightly more than the diameter of the bolt

7. The compression members tend to buckle in the direction of:
   a. Axis of load
   b. Minimum cross-section
   c. least radius of gyration
   d. perpendicular to the axis of load

C. Least radius of gyration

8. A kinematic chain needs a minimum:
   a. 2 links and 2 turning pairs
   b. 3 links and turning pairs
   c. 4 links and 4 turning pairs
   d. 3 links and 2 turning pairs

C. 4 links and 4 turning pairs

9. Which of the following pairs is formed if shaft is revolving in a bearing?
   a. Lower pair
   b. turning pair
   c. sliding pair
   d. cylindrical pair

A. Lower pair

10. How many links are there in a pantograph?
    a. 3
    b. 4
    c. 5
    d. 6

B. 4

11. A pantograph is a mechanism having:
    a. Lower pairs
    b. rolling pairs
    c. spherical pairs
    d. higher pairs

A. Lower pairs

12. Which of the following describes the “slip” in belt drive?
    a. Loss in power
    b. Difference between the angular velocities of two pulley
    c. Difference between linear speed of the rim
    d. Difference between the linear speed of the rim of pulley and the on it

D. Difference between the linear speed of the rim of pulley and the on it

13. Which of the following is the orientation of the axes of the two shafts in cross helical worm?
    a. Parallel
    b. Non-parallel
    c. Intersecting
    d. non-parallel and non-intersecting

D. Non-parallel and non-intersecting

14. In case of gears the addendum is given by:
    a. One module
    b. 2.16 x module
    c. 1.57 x module
    d. 1.25 / module

A. One module

15. How do you call a cam where in the follower reciprocates or oscillates in a plane parallel to its axis?
    a. Circular cam
    b. reciprocating cam
    c. cylindrical cam
    d. oscillating cam

C. Cylindrical cam

16. How are gears for watches generally manufactured?
    a. Die casting
    b. Machining on hobber
    c. power metallurgy process
    d. stamping

D. Stamping

17. Rope brake dynamometer uses what?
    a. Oil as lubricant
    b. No lubricant
    c. grease as lubricant
    d. water as lubricant

B. No lubricant

18. Which of the following could be the effect of cold working?
    a. Increases the fatigue strength
    b. Decreases the fatigue strength
    c. Has no influence on fatigue strength
    d. None of these

A. Increases the fatigue strength

19. In testing a material for endurance strength, it is subjected to:
    a. Completely reversed load
    b. Static load
    c. impact load
    d. dynamic load

A. Completely reversed load

20. Coaxing is the procedure of increasing:
    a. Metal strength
    b. Metal hardness by surface treatment
    c. Metal resistance to corrosion by coating
    d. Fatigue limit by overstressing the metal by successively increasing loadings

D. Fatigue limit by overstressing the metal by successively increasing loadings

21. Up to what percent thickness of plate, edge preparation for welding is not needed?
    a. 2 mm
    b. 4 mm
    c. 8 mm
    d. 12 mm

B. 4 mm

22. Arc blow takes place in:
    a. Gas welding
    b. Arc welding when straight polarity is used
    c. Arc welding when reversed polarity is used
    d. Welding stainless steel

D. Welding stainless steel

23. What is the function clutch in the machine tool?
    a. Alignment of drive
    b. Lowering of drive
    c. To insure that two shafts line up at high speed
    d. To connect shaft so that the driven shaft will rotate with the driving shaft and to disconnect them at all

D. To connect shaft so that the driven shaft will rotate with the driving shaft and to disconnect them at all

24. The height of tooth above the pitch circle or the radial distance between pitch circle and top land of the tooth.
    a. Addendum
    b. Deddendum
    c. top root
    d. top land

A. Addendum

25. How do you call the distance of the tooth which is equal to the sum of the addendum and deddendum?
    a. Full depth
    b. working depth
    c. whole depth
    d. pitch

C. Whole depth

26. Which of the following stresses that is independent of loads?
    a. Shear stress
    b. residual stress
    c. design stress
    d. yield stress

B. Residual stress

27. Which of the following is not used to resemble the shape of tool bit?
    a. Thread cutting
    b. center cutting
    c. square nose
    d. round nose

B. Center cutting

28. What is the recommended best cutting angle of drill for work on steel or cast iron?
    a. 39 degrees
    b. 49 degrees
    c. 59 degrees
    d. 29 degrees

C. 59 degrees

29. Copper and most of its alloys can be hardened by which of the following?
    a. Cold working
    b. Soaking
    c. Patenting
    d. case hardening

A. Cold working

30. Types of V-belts to use in a driving pulley with speed of 360 rpm and transmitting 5 Hp.
    a. Type A belts
    b. type B belts
    c. type C belts
    d. type D belts

B. Type B belts

31. Which of the following is not an angle measuring device?
    a. Bevel protector
    b. Sine bar
    c. combination square
    d. angle iron

D. Angle iron

32. The mould for casting ferrous materials in continuous casting process is made of what material?
    a. Copper
    b. Medium carbon steel
    c. high carbon steel
    d. low carbon steel

A. Copper

33. Clutch slippage while clutch is engaged is especially noticeable:
    a. During idling
    b. A low speed
    c. during acceleration
    d. during braking

C. During acceleration

34. In general, to engage securely and prevent dragging, what is the clearance between release bearing and release collar in the clutch?
    a. 2-3 mm
    b. 4-5 mm
    c. 6-7 mm
    d. 8-9 mm

A. 2-3 mm

35. Piston compression rings are made of what material?
    a. Steel
    b. Bronze
    c. Aluminum
    d. cast iron

D. Cast iron

36. What is the usual value of helix angle of a drill?
    a. 120 degrees
    b. 110 degrees
    c. 60 degrees
    d. 30 degrees

D. 30 degrees

37. What is meant by drossing?
    a. A method of cleaning the casting
    b. An inspection method for casting
    c. A method of deoxidation of molten metal
    d. The formation of oxides on the molten metal surface

D. The formation of oxides on the molten metal surface

38. If the first digit in AISI and SAE designations is one (1), then, it indicates what?
    a. Carbon steel
    b. Nickel steel
    c. molybdenum steel
    d. chromium steels

A. Carbon steel

39. Which of the following where the gear tooth vernier is used to measure?
    a. Module
    b. Gear tooth profile
    c. gear tooth thickness of gear tooth
    d. pitch line thickness of gear tooth

B. Gear tooth profile

40. A cold chisel is made of what?
    a. Mild steel
    b. German silver
    c. high carbon steel
    d. cast iron

C. High carbon steel

41. It is the ability of a material to absorb energy when deformed elastically and return it when unloaded.
    A. Creep
    B. fatigue strength
    C. resilience
    D. toughness

C. Resilience

42. Which of the following cams where the follower reciprocates or oscillates in a plane parallel to the axis of rotation?
    a. Cam curves
    b. radial cam
    c. cylindrical cam
    d. tangential cam

C. Cylindrical cam

43. Which of the following cams where the follower reciprocates or oscillates in a plane perpendicular its axis of rotation?
    a. Tangential cam
    b. cam curves
    c. radial cam
    d. cylindrical cam

C. Radial cam

44. During tensile test, which of the following stress-strain curve(s) fits for a glass rod?
    a. A straight line
    b. A parabola
    c. an irregular curve
    d. a sudden break

D. A sudden break

45. In case of a knuckle joint, the pin is most likely to fail in:
    a. Shear
    b. Tension
    c. Compression
    d. double shear

D. Double shear

46. A single ply leather belt running at a belt velocity of 300 ft/min is likely to transmit per inch of width:
    a. 2.5 Hp
    b. 3.0 Hp
    c. 4.0 Hp
    d. 5.0 Hp

C. 4.0 Hp

47. At what temperature range where ferromagnetic alpha iron exists?
    a. Below 723°C
    b. 700-910°C
    c. 1000-1440°C
    d. above 1539°C

A. Below 723°C

48. How do you call a body having identical properties all over?
    a. Heterogeneous
    b. Homogeneous
    c. Elastic
    d. Ductile

B. Homogeneous

49. How is the material described if it recovers its original dimensions when the load is removed?
    a. Elastic
    b. Plastic
    c. Brittle
    d. Malleable

A. Elastic

50. What is the percentage of carbon in Eutectoid steel?
    a. .02%
    b. 0.30%
    c. 0.63%
    d. 0.80%

D. 0.80%

51. The presence of sulphur in pig iron makes:
    a. The casting unsound
    b. It brittle
    c. it hard
    d. it is easy machinable

A. The casting unsound

52. What is the effect of alloying zinc to copper?
    a. Increases hardness
    b. Impart free-machining
    c. Improve hardness and strength
    d. Increases strength and ductility (if added up to 10-30%)

D. Increases strength and ductility (if added up to 10-30%)

53. The imperfection in the crystal structure of metal is:
    a. Impurity
    b. fracture slip
    c. slip
    d. dislocation

D. Dislocation

54. When is the pressure release in resistance welding?
    a. After the weld cools
    b. During heating period
    c. After completion of current
    d. Just at the time of passing the current

A. After the weld cools

55. If t is the thickness of sheet to be spot welded, then electrode tip diameter is equal to _.
    a. t2
    b. 2 sq rt. of t
    c. sq. rt. of t
    d. 1.5 sq. rt. of 1

B. 2 sq rt. of t

56. A twist drill specified by which of the following?
    a. Its shank and diameter
    b. Shank, material and flute size
    c. its diameter and lip angle
    d. shank, material and diameter

D. Shank, material and diameter

57. Which of the following is used to measure the clearance between the value and tappet of an automobile engine?
    a. Shape gauge
    b. slip gauge
    c. feeler gauge
    d. vernier scale

C. Feeler gauge

58. Speedometer drive is generally taken from:
    a. Gear box
    b. fan belt
    c. flywheel
    d. front wheel

D. Front wheel

59. What is the usual percentage of cut on the return stroke of hacksaw blade?
    a. 0
    b. 5
    c. 7
    d. 9

A. 0

60. Which of the following will best describe sunken key?
    a. The keyway is helical along shaft
    b. The keyway is cut in shaft only
    c. The keyway is cut in hub only
    d. The key is cut in both shaft and hub

D. The key is cut in both shaft and hub

61. Which of the following where turn buckle has?
    a. Left hand threads on one end and right hand threads on other end
    b. Right hand threads on both ends
    c. Left hand threads on both ends
    d. No threads

A. Left hand threads on one end and right hand threads on other end

62. Which of the following is the best process for butt welding of two plates each of which is 25 mm thick?
    a. Electro slag welding
    b. Gas welding
    c. submerge arc welding
    d. steam welding

A. Electro slag welding

63. Which of the following statement(s) is correct for an oil less bearing:
    a. The oil film is maintained by supplying oil under pressure
    b. The oil film pressure is produced only by rotation of the journal
    c. Do not need external supply of lubricant
    d. Grease is needed to be applied after some intervals

C. Do not need external supply of lubricant

64. The working load P for a chain for crane applications is expressed in terms of diameter of link “d” in cm as follows.
    a. P=1.5d2
    b. P=25d2
    c. P=50d2
    d. P=500d2

D. P=500d2

65. The column splice is used for increasing:
    a. Cross-sectional area of the column
    b. Length of the column
    c. strength of the column
    d. All of the above

B. Length of the column

66. At what temperature those Gamma irons exist?
    a. Between 910°C and 1400°C
    b. Between 1400°C and 1539°C
    c. Near melting point
    d. Room temperature

A. Between 910°C and 1400°C

67. The behavior of metals where in strength of a material is increased and the ductility is decreased on heating at a relatively low temperature after cold working is called:
    a. Clustering
    b. Twinning
    c. screw dislocation
    d. strain aging

D. Strain aging

68. Which of the following statement(s) is correct in “carbon steel castings”?
    a. the percentage of carbon is less than 1.7%
    b. the percentage of carbon is between 1.7% to 2%
    c. the percentage for alloying elements is controlled
    d. none of the above

A. The percentage of carbon is less than 1.7%

69. Aluminum alloys for pressure die casting:
    a. Must not be free from hot shortness
    b. Must have iron as one of the constitutions
    c. Must not posses considerable fluidity
    d. Must be light

C. Must not posses considerable fluidity

70. Which of the following is the maximum in 18 4-1 high speed steel?
    a. Tungsten
    b. Chromium
    c. Argon
    d. iron

D. Iron

71. Super conductors:
    a. Exist at temperature below 10K
    b. Are the dense metals without voids
    c. Are non-metallic substances
    d. Are the purest forms of metals

A. Exist at temperature below 10K

72. When large number of components ate turned and parted off from a bar, the chuck generally used is:
    a. Two jaw chuck
    b. Four jaw chuck
    c. collet chuck
    d. magnetic chuck

D. Magnetic chuck

73. Cutting speed for some materials are as under which one of the following could be cutting speed for brass?
    a. 30 m/min
    b. 40 m/min
    c. 80 m/min
    d. 50 m/min

B. 40 m/min

74. If V is the volume of metal in casting and A is its surface area, then the time of solidification will be proportional to:
    a. V2 , 1/A
    b. 1/V2 , A2
    c. V , 1/A2
    d. V2 , 1/A2

D. V2 , 1/A2

75. The draft allowance on metallic pattern as compared to wooden ones is:
    a. More
    b. Same
    c. Less
    d. more or less depending on size

C. Less

76. Arc metal patterns are used for:
    a. Precision castings
    b. Small castings
    c. Large castings
    d. Large scale production of castings

D. Large scale production of castings

77. What tool is used in foundry for repairing the mould?
    a. Swab
    b. Gagger
    c. Bellows
    d. rammer

A. Swab

78. What tool is used in foundry for smoothening and cleaning out depression in the mould?
    a. Swab
    b. Gagger
    c. Bellows
    d. rammer

C. Bellows

79. Which of the following does not have to be lubricated when drilling?
    A. Brass
    B. Steel
    C. Monel
    D. mild steel

A. Brass

80. The tool used in precision work to smooth or enlarge holes is called a:
    a. Round out
    b. drift pin
    c. reamer
    d. protractor

A. Round out

81. When measuring a drill for size, measure across the:
    a. Margins
    b. Flutes
    c. Shank
    d. point

A. Margins

82. How do you call the tool used for cleaning files?
    a. File cleaner
    b. file card
    c. file oilstone
    d. scraper

B. File card

83. The melting point of Babbitt is approximately:
    a. 1000°F
    b. 650°F
    c. 750°F
    d. 500°F

B. 650°F

84. How is tubing measured?
    a. Inside diameter
    b. outside diameter
    c. thickness of wall
    d. wire gage

B. Outside diameter

85. Which of the following metals will respond to heat treatment?
    a. Cast iron
    b. wrought iron
    c. medium carbon steel
    d. low carbon steel

C. Medium carbon steel

86. the ability of metal to withstand loads without breaking down is:
    a. stress
    b. strength
    c. strain
    d. elasticity

B. Strength

87. Which of the following metals is non magnetic?
    a. Cast iron
    b. alloy steel
    c. cast steel
    d. manganese steel

D. Manganese steel

88. A machining operation whereby the tool reciprocated and the feed is stationary.
    a. Planning
    b. Shaping
    c. Turning
    d. reaming

B. Shaping

89. Which of the following is not a tap used for cutting threads in holes?
    a. Tapping tap
    b. plug tap
    c. tapper tap
    d. bottoming tap

A. Tapping tap

90. Herring bone gears are gears which:
    a. Do not operate on parallel shafts
    b. Have a line contact between the teeth
    c. Consists of two left handed helical gears
    d. Tend to produce thrust on the shafts

B. Have a line contact between the teeth

91. Which of the following statements is true for the internal stresses existing in a welded connection?
    a. Internal stresses are not relieved by heat treatment
    b. Internal stresses are not relieved when weld is peened
    c. Internal stresses may be relieved when weld is peened
    d. Internal stresses are relieved by x-ray analysis

B. Internal stresses are not relieved when weld is peened

92. Stainless steel is obtained principally by the use of which of the alloying elements?
    a. Chromium
    b. Nickel
    c. Carbon
    d. tungsten

A. Chromium

93. Galvanized iron is a term referring to iron coated with:
    a. Tin
    b. Zinc
    c. Magnesium
    d. aluminum

B. Zinc

94. Which of the following is not a common term relating to the classification of fits?
    a. Tunking
    b. Snug
    c. medium force fit
    d. bound

D. Bound

95. In usual spur gearing, which of the following statement(s) is correct?
    a. Pitch circles and base circles are the same
    b. Working depth includes the clearance
    c. Tooth outline are usually involute curves
    d. Tooth outline are usually cycloidal curves

c. Tooth outline are usually involute curves

96. In general, the design stress and factor of safety are related as follows:
    a. Design stress=ultimate stress times factor of safety
    b. Design stress= ultimate stress divided by factor of safety
    c. Factor of safety= design stress divided by ultimate stress
    d. Ultimate stress=factor of safety divided by design stress

B. Design stress = ultimate stress divided by factor of safety

97. In usual spur gearing, the:
    a. Pitch circle and base circle are the same
    b. Working depth includes clearance
    c. Tooth outline are always cycloidal curves
    d. Tooth outline are usually involute curves

D. Tooth outline are usually involute curves

98. Which of the following is the not the other name of circumferential stress for thin walled cylinders.
    a. Hoop stress
    b. girth stress
    c. tangential stress
    d. longitudinal stress

D. Longitudinal stress

99. How do you call the ratio of the volumetric strain?
    a. Modulus in shear
    b. Stress to strain ratio
    c. volumetric ratio
    d. bulk modulus

D. Bulk modulus

100. Hearing bone gears are gears which:
     a. Do not operate parallel shafts
     b. Have a line contact between the teeth
     c. Tend to produce and thrust on the shafts
     d. Consists of two left handed helical gears

B. Have a line contact between the teeth