MCQs in Engineering Materials Part II

(Last Updated On: December 8, 2017)

MCQs in Engineering Materials Part 2

This is the Multiples Choice Questions Part 2 of the Series in Engineering Materials as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

Online Questions and Answers in Engineering Materials Series

Following is the list of multiple choice questions in this brand new series:

Engineering Materials MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII

Continue Practice Exam Test Questions Part II of the Series

Choose the letter of the best answer in each questions.

51. What type of steel has 0.8% carbon and 100% pearlite?

  • A. Austenite
  • B. Eutectoid
  • C. Hyper-eutectoid
  • D. Stainless steel

52. What group of steel are water-hardened tool steels?

  • A. Group S
  • B. Group W
  • C. Group O
  • D. Group T

53. What group of steels are molybdenum high-speed steels?

  • A. Group A
  • B. Group D
  • C. Group M
  • D. Group H

54. Steels that are used for axles, gears, and similar parts requiring medium to high and strength are known as?

  • A. Medium-carbon steel
  • B. Low-carbon steel
  • C. Very high-carbon
  • D. High-carbon steel

55. Galvanized steel are steel products coated with _________.

  • A. Carbon
  • B. Sulfur
  • C. Zinc
  • D. Nickel

56. What ASTM test for tension is designated for plastics?

  • A. A370
  • B. D638
  • C. E292
  • D. C674

57. What ASTM test for compression is designated for plastic?

  • A. D638
  • B. D695
  • C. D790
  • D. D732

58. What ASTM test for shear strength is designated for plastics?

  • A. D732
  • B. D790
  • C. D695
  • D. D638

59. What is the ASTM tension testing designation for standard methods for steel products?

  • A. A370
  • B. E345
  • C. E8
  • D. C674

60. Low-quality steels with an M suffix on the designation intended for non-structural application is classified as ____________.

  • A. Merchant quality
  • B. Commercial quality
  • C. Drawing quality
  • D. Special quality

61. The use of acids to remove oxides and scale on hot-worked steels is known as_______.

  • A. Tempering
  • B. Pickling
  • C. Machining
  • D. Galvanizing

62. What is the purpose of molybdenum in steel alloying?

  • A. To increase brittleness
  • B. To increase dynamic and high-temperature strength and hardness.
  • C. To reduce brittleness, combine with sulfur
  • D. To increase corrosion and resistance

63. Which of the following statements is NOT true?

  • A. About 10% of the earth’s crust is iron.
  • B. Pure iron does not have significant industrial use because it is too weak and soft.
  • C. Steel is an alloy of carbon and iron with limits on the amount of carbon (less than 2%)
  • D. Steel is made by reducing oxide ore of iron by thermochemical reactions in a blast furnace or direct reductions vessel.

64. What prefix in steel identification means composition varies from normal limits?

  • A. E
  • B. H
  • C. X
  • D. B

65. What is prefix in steel identification means it is made in an electric furnace?

  • A. E
  • B. H
  • C. X
  • D. B

66. What letter suffix steel identification means that it is steel with boron as an alloying element?

  • A. xxLxx
  • B. xxBxx
  • C. xxHxx
  • D. xxKxx

67. What refers to the tin mill steel, without a coating?

  • A. White plate
  • B. Tin Steel free
  • C. Black plate
  • D. Dechromate tin

68. What combination of elements has high electrical resistance, high corrosion resistance, and high strength at red hear temperatures, making it useful in resistance heating?

  • A. Aluminum bronze
  • B. Nichrome
  • C. Hastelloy
  • D. Alnico

69. A steel cannot qualify for stainless prefix until it has at least how many percent of chromium?

  • A. 10 %
  • B. 20 %
  • C. 25 %
  • D. 5 %

70. Which of the following cast irons is a high-carbon, iron-carbon-silicon alloy?

  • A. Deorizers
  • B. Deoxidizers
  • C. Deterrent
  • D. Deoxifiers

71. Which of the following cast irons is a high-carbon-silicon alloy?

  • A. Gray iron
  • B. Malleable iron
  • C. White iron
  • D. Alloy iron

72. Which of the following cast irons is heat-treated for ductility?

  • A. Gray iron
  • B. Malleable iron
  • C. White iron
  • D. Ductile iron

73. Which cast iron is hard and wear resistant?

  • A. Gray iron
  • B. Ductile iron
  • C. White iron
  • D. Malleable iron

74. What is considered as the general purpose oldest type and widely used cast iron?

  • A. Gray iron
  • B. Ductile iron
  • C. Alloy iron
  • D. Malleable iron

75. What is the effect if manganese in cast iron?

  • A. To affect the machinability, ductility and shrinkage depending on form
  • B. To reduce hardness by combining with sulfur below 0.5% and increase hardness above 0.5%
  • C. To dioxide molten cast iron
  • D. To increase fluidity and lowers melting temperature

76. What is the effect of aluminum in cast iron?

  • A. To increase hardness above 0.5%
  • B. To deoxidize molten cast iron
  • C. To affect machinability, ductility, and shrinkage depending on form
  • D. To reduce hardness by combining with sulfur below 0.5%

77. What is the effect of silicon in cast iron?

  • A. Reduce hardness by combining with sulfur below 0.5% and increase the hardness above 0.5%
  • B. Increase fluidity and lowers melting temperature.
  • C. Softens iron and increase ductility below 3.25% hardens iron above 3.25% and increase acid and corrosion resistance above 13%
  • D. deoxidizes molten cast iron

78. Iron is said to be abundant in nature. About how many percent of the earth’s crust is iron?

  • A. 10 %
  • B. 5 %
  • C. 20 %
  • D. 8 %

79. What is the advantage of quench hardening?

  • A. Improved strength
  • B. Hardness
  • C. Wear characteristics
  • D. All of the choices

80. What is the lowest-temperature diffusion-hardening process and does not require a quench?

  • A. Carburizing
  • B. Tempering
  • C. Nitriding
  • D. Heat-treating

81. The following statements are true except one. Which one?

  • A. Carburizing does not harden a steel.
  • B. Flame and induction hardening require the use of hardenable steels.
  • C. Quench-hardened steel does not require tempering to prevent brittleness.
  • D. Induction hardening is usually most efficient on small parts.

82. Which of he following is a requirement for hardening a steel?

  • A. Heating to the proper temperature
  • B. Sufficient carbon content
  • C. Adequate quench
  • D. All of the choices

83. What field of study encompasses the procurement and production of metals?

  • A. Metallurgy
  • B. Geology
  • C. Material Science
  • D. Metalgraphy

84. What do you call earth and stone missed with the iron oxides?

  • A. Hematite
  • B. Magnetite
  • C. Gangue
  • D. Ore

85. What is a coal that has been previously burned in an oxygen-poor environment?

  • A. Tuyere
  • B. Coke
  • C. Diamond
  • D. Hematite

86. What is the most common alloying ingredient in copper?

  • A. Brass
  • B. Zinc
  • C. Nickle
  • D. Aluminum

87. What refers to the casehardening process by which the carbon content of the steel ear the surface of a part is increased?

  • A. Carburizing
  • B. Annealing
  • C. Normalizing
  • D. Martempering

88. What is the process of heating a hardened steel to any temperature below the lower critical temperature, followed by any desired rate of cooling?

  • A. Normalizing
  • B. Spheroidizing
  • C. Carburizing
  • D. Tempering

89. What is defined as an intimate mechanical mixture of two or more phases having a definite composition and a definite temperature of transformation within the solid state?

  • A. Pearlite
  • B. Eutectoid
  • C. Austernite
  • D. Delta solid solution

90. What is the most undesirable of all the elements commonly found in steels?

  • A. Sulfur
  • B. Phosphorus
  • C. Silicon
  • D. Manganese

91. What is a method of casehardening involving diffusion in which the steel to be casehardened is machined, heat-treated, placed in an air-tight box and heated to about 1000oF?

  • A. Annealing
  • B. Normalizing
  • C. Carburizing
  • D. Nitriding

92. What typical penetrator is used in Brinell hardness test?

  • A. 10 mm ball
  • B. 120° diamond (brale)
  • C. 1.6 mm diameter ball
  • D. 20°needle

93. What is the ratio of the maximum load in a tension test to the original cross-sectional area of the test bar?

  • A. Tensile strength
  • B. Yield strength
  • C. Shear strength
  • D. Flexural Strength

94. What is the ratio of stress to strain in a material loaded within its elastic ranger?

  • A. Poisson’s ratio
  • B. Refractive index
  • C. Modulus of elasticity
  • D. Percent elongation

95. What is a measure of rigidity?

  • A. Stiffness
  • B. Hardness
  • C. Strength
  • D. Modulus of elasticity

96. In tensile testing, the increase in the gage length measured after the specimen fractures, within the gage length is called _______.

  • A. percent elongation
  • B. creep
  • C. elasticity
  • D. elongation

97. What impurity in steel can cause “red shortness”, which means the steel becomes unworkable at high temperature?

  • A. Sulfur
  • B. Silicon
  • C. Manganese
  • D. Phosphorus

98. What is a process of producing a hard surface in a steel having a sufficiently high carbon content to respond to hardening by a rapid cooling of the surface?

  • A. Cyaniding
  • B. Nitriding
  • C. Flame hardening
  • D. Induction hardening

99. What is the common reinforcement for polymer composites?

  • A. Boron
  • B. Ceramic
  • C. Graphite
  • D. Glass fiber

100. Which of the following fluids conducts electricity?

  • A. Electrolyte
  • B. Water
  • C. Solution
  • D. Acid

Complete List of MCQs in General Engineering and Applied Science per topic

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