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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2051. |
In induction hardening, the depth of hardening is controlled by controlling the voltage. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2052. |
The machinability of steel is improved by adding |
| A. | nickel |
| B. | chromium |
| C. | nickel and chromium |
| D. | sulphur, lead and phosphorus |
| Answer» E. | |
| 2053. |
The carbon in the pig iron varies from |
| A. | 0.1 to 0.5% |
| B. | 0.5 to 1% |
| C. | 1 to 5% |
| D. | 5 to 10% |
| Answer» D. 5 to 10% | |
| 2054. |
The type of space lattice found in alpha-iron is |
| A. | face centred cubic space lattice |
| B. | body centred cubic space lattice |
| C. | close packed hexagonal space lattice |
| D. | none of these |
| Answer» C. close packed hexagonal space lattice | |
| 2055. |
Pearlite consists of |
| A. | 13% carbon and 87% ferrite |
| B. | 13% cementite and 87% ferrite |
| C. | 13% ferrite and 87% cementite |
| D. | 6.67% carbon and 93.33% iron |
| Answer» C. 13% ferrite and 87% cementite | |
| 2056. |
Incoloy, Hastelloy and Vitallium are __________ temperature alloys. |
| A. | high |
| B. | low |
| Answer» B. low | |
| 2057. |
Bronze is an alloy of |
| A. | copper and zinc |
| B. | copper and tin |
| C. | copper, tin and zinc |
| D. | none of these |
| Answer» C. copper, tin and zinc | |
| 2058. |
Beryllium bronze has |
| A. | high yield point |
| B. | high fatigue limit |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 2059. |
The steel widely used for motor car crankshafts is |
| A. | nickel steel |
| B. | chrome steel |
| C. | nickel-chrome steel |
| D. | silicon steel |
| Answer» C. nickel-chrome steel | |
| 2060. |
Combined carbon in iron makes the metal |
| A. | soft and gives coarse grained crystalline structure |
| B. | soft and gives a fine grained crystalline structure |
| C. | hard and gives a coarse grained crystalline structure |
| D. | hard and gives a fine grained crystalline structure |
| Answer» E. | |
| 2061. |
The property of a material essential for spring materials is |
| A. | stiffness |
| B. | ductility |
| C. | resilience |
| D. | plasticity |
| Answer» D. plasticity | |
| 2062. |
Which of the following statements are true for annealing of steels? |
| A. | Steels are heated to 500 to 700 C |
| B. | Cooling is done slowly and steadily |
| C. | Internal stresses are relieved |
| D. | all of these |
| Answer» E. | |
| 2063. |
The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2064. |
In flame hardening, oxy-acetylene flame is used. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2065. |
Which of the following material has nearly zero coefficient of expansion? |
| A. | Stainless steel |
| B. | High speed steel |
| C. | Invar |
| D. | Heat resisting steel |
| Answer» D. Heat resisting steel | |
| 2066. |
A steel with carbon above 0.8% is known as hyper-eutectoid steel. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2067. |
Which of the following steel making process is being adopted at Rourkela Steel Plant? |
| A. | Bessemer process |
| B. | Open-hearth process |
| C. | Electric process |
| D. | L-D process |
| Answer» E. | |
| 2068. |
The malleability is the property of a material by virtue of which a material |
| A. | regains its shape and size after the removal of external forces |
| B. | retains the deformation produced under load permanently |
| C. | can be drawn into wires with the application of a tensile force |
| D. | can be rolled or hammered into thin sheets |
| Answer» E. | |
| 2069. |
Micro-structure of a material is, generally, examined by |
| A. | naked eye |
| B. | optical microscope |
| C. | X-ray techniques |
| D. | none of these |
| Answer» E. | |
| 2070. |
In corrosion resistant properties, bronzes are __________ to brasses. |
| A. | superior |
| B. | inferior |
| Answer» B. inferior | |
| 2071. |
Duplex process of steel making is a combination of |
| A. | basic bessemer and acid open hearth processes |
| B. | acid bessemer and basic open hearth processes |
| C. | acid bessemer and acid open hearth processes |
| D. | basic bessemer and basic open hearth processes |
| Answer» C. acid bessemer and acid open hearth processes | |
| 2072. |
Brittle materials when subjected to tensile loads, snap off without giving any sensible elongation. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2073. |
The portion of the blast furnace above its widest cross-section is called |
| A. | hearth |
| B. | stack |
| C. | bosh |
| D. | throat |
| Answer» C. bosh | |
| 2074. |
The addition of magnesium to cast iron increases its |
| A. | hardness |
| B. | ductility and strength in tension |
| C. | corrosion resistance |
| D. | creep strength |
| Answer» C. corrosion resistance | |
| 2075. |
The phosphorus and sulphur in steel making can be removed by using basic bessemer process. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2076. |
A steel with 0.8% carbon and 100% pearlite is called |
| A. | eutectoid steel |
| B. | hypo-eutectoid steel |
| C. | hyper-eutectoid steel |
| D. | none of these |
| Answer» B. hypo-eutectoid steel | |
| 2077. |
Killed steels |
| A. | have minimum impurity level |
| B. | are produced by L-D process |
| C. | have almost zero percentage of phosphorus and sulphur |
| D. | are free from oxygen |
| Answer» E. | |
| 2078. |
The slow cooling of steel from the __________ results in a coarse grained structure. |
| A. | lower critical point |
| B. | upper critical point |
| Answer» C. | |
| 2079. |
Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state? |
| A. | Ferrite and pearlite |
| B. | Cementite and pearlite |
| C. | Ferrite and bainite |
| D. | Cementite and martensite |
| Answer» C. Ferrite and bainite | |
| 2080. |
The alloying element which can replace tungsten in high speed steels is |
| A. | nickel |
| B. | vanadium |
| C. | cobalt |
| D. | molybdenum |
| Answer» E. | |
| 2081. |
Vanadium when added to steel |
| A. | increases tensile strength |
| B. | decreases tensile strength |
| C. | raises critical temperature |
| D. | Sowers critical temperature |
| Answer» B. decreases tensile strength | |
| 2082. |
18-4-1 high speed steel contains |
| A. | vanadium 4%, chromium 18% and tungsten 1% |
| B. | vanadium 1%, chromium 4% and tungsten 18% |
| C. | vanadium 18%, chromium 1% and tungsten 4% |
| D. | none of the above |
| Answer» C. vanadium 18%, chromium 1% and tungsten 4% | |
| 2083. |
The heat treatment process used for castings is |
| A. | carburising |
| B. | normalising |
| C. | annealing |
| D. | tempering |
| Answer» C. annealing | |
| 2084. |
During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2085. |
18/8 stainless steel consists of |
| A. | 18% nickel and 8% chromium |
| B. | 18% chromium and 8% nickel |
| C. | 18% nickel and 18% chromium |
| D. | 8% nickel and 8% chromium |
| Answer» C. 18% nickel and 18% chromium | |
| 2086. |
The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained |
| A. | controls the grade of pig iron |
| B. | acts as an iron-bearing mineral |
| C. | supplies heat to reduce ore and melt the iron |
| D. | forms a slag by combining with impurities |
| Answer» E. | |
| 2087. |
Grey cast iron has |
| A. | carbon in the form of free graphite |
| B. | high tensile strength |
| C. | low compressive strength |
| D. | all of these |
| Answer» B. high tensile strength | |
| 2088. |
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces |
| A. | white cast iron |
| B. | nodular cast iron |
| C. | malleable cast iron |
| D. | alloy cast iron |
| Answer» E. | |
| 2089. |
The strength is the ability of a material to resist |
| A. | deformation under stress |
| B. | externally applied forces with breakdown or yielding |
| C. | fracture due to high impact loads |
| D. | none of these |
| Answer» C. fracture due to high impact loads | |
| 2090. |
The metal suitable for bearings subjected to light loads, is |
| A. | silicon bronze |
| B. | white metal |
| C. | monel metal |
| D. | phosphor bronze |
| Answer» E. | |
| 2091. |
The material widely used for making pendulums of clocks is |
| A. | stainless steel |
| B. | high speed steel |
| C. | heat resisting steel |
| D. | nickel steel |
| Answer» E. | |
| 2092. |
The blade of a power saw is made of |
| A. | boron steel |
| B. | high speed steel |
| C. | stainless steel |
| D. | malleable cast iron |
| Answer» C. stainless steel | |
| 2093. |
In induction hardening __________ is high. |
| A. | current |
| B. | voltage |
| C. | frequency |
| D. | temperature |
| Answer» D. temperature | |
| 2094. |
The stiffness is the ability of a material to resist |
| A. | deformation under stress |
| B. | fracture due to high impact loads |
| C. | externally applied forces with breakdown or yielding |
| D. | none of the above |
| Answer» B. fracture due to high impact loads | |
| 2095. |
Quenching is not necessary when hardening is done by |
| A. | case hardening |
| B. | flame hardening |
| C. | nitriding |
| D. | any one of these |
| Answer» D. any one of these | |
| 2096. |
Hindalium is an alloy of aluminium and magnesium with a small quantity of chromium. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2097. |
When a low carbon steel is heated upto upper critical temperature |
| A. | there is no change in grain size |
| B. | the average grain size is a minimum |
| C. | the grain size increases very rapidly |
| D. | the grain size first increases and then decreases very rapidly |
| Answer» C. the grain size increases very rapidly | |
| 2098. |
The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 2099. |
Bell-Coleman cycle is a |
| A. | reversed Carnot cycle |
| B. | reversed Otto cycle |
| C. | reversed Joule cycle |
| D. | reversed Rankine cycle |
| Answer» D. reversed Rankine cycle | |
| 2100. |
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as |
| A. | <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/409-69-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/409-69-2.png"> |
| C. | <i>AU C<sub>min</sub></i> |
| D. | <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/409-69-3.png"> |
| Answer» E. | |