MCQOPTIONS
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MCQOPTIONS
This section includes 614 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
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. | |
| 102. |
In the middle part of the blast furnace (zone of absorption), the temperature is |
| A. | 400° to 700°C |
| B. | 800°C to 1000°C |
| C. | 1200°C to 1300°C |
| D. | 1500°C to 1700°C |
| Answer» C. 1200°C to 1300°C | |
| 103. |
A steel alloy containing 36% nickel is called |
| A. | stainless steel |
| B. | high speed steel |
| C. | invar |
| D. | heat resisting steel |
| Answer» D. heat resisting steel | |
| 104. |
The coordination number of a face centred cubic space lattice is |
| A. | six |
| B. | twelve |
| C. | eighteen |
| D. | twenty |
| Answer» C. eighteen | |
| 105. |
The cutting tools are made from |
| A. | nickel steel |
| B. | chrome steel |
| C. | nickel-chrome steel |
| D. | high speed steel |
| Answer» E. | |
| 106. |
An alloy of copper, tin and zinc is known as |
| A. | brass |
| B. | bronze |
| C. | gun metal |
| D. | muntz metal |
| Answer» D. muntz metal | |
| 107. |
In a unit cell of a body centred cubic space lattice, there are __________ atoms. |
| A. | six |
| B. | nine |
| C. | fourteen |
| D. | seventeen |
| Answer» C. fourteen | |
| 108. |
Which of the following is added in low carbon steels to prevent them from becoming porous? |
| A. | Sulphur |
| B. | Phosphorus |
| C. | Manganese |
| D. | Silicon |
| Answer» E. | |
| 109. |
Duralumin has better strength than Y-alloy at high temperature. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 110. |
A fine grained steel |
| A. | is less tough and has a greater tendency to distort during heat treatment |
| B. | is more ductile and has a less tendency to distort during heat treatment |
| C. | is less tough and has a less tendency to distort during heat treatment |
| D. | is more ductile and has a greater tendency to distort during heat treatment |
| Answer» C. is less tough and has a less tendency to distort during heat treatment | |
| 111. |
When a medium carbon steel is heated to coarsening 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» D. the grain size first increases and then decreases very rapidly | |
| 112. |
According to Indian standard specifications, a plain carbon steel designated by 40 C8 means that the carbon content is |
| A. | 0.04% |
| B. | 0.35 to 0.45% |
| C. | 0.4 to 0.6% |
| D. | 0.6 to 0.8% |
| Answer» C. 0.4 to 0.6% | |
| 113. |
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 | |
| 114. |
In acidic bessemer process, the furnace is lined with |
| A. | silica bricks |
| B. | a mixture of tar and burnt dolomite bricks |
| C. | either (a) or (b) |
| D. | none of these |
| Answer» B. a mixture of tar and burnt dolomite bricks | |
| 115. |
In iron, the presence of carbon in free form is called graphite. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 116. |
The percentage of carbon in cast iron varies from |
| A. | 0.1 to 0.5 |
| B. | 0.5 to 1 |
| C. | 1 to 1.7 |
| D. | 1.7 to 4.5 |
| Answer» E. | |
| 117. |
Malleable cast iron is produced |
| A. | by adding magnesium to molten cast iron |
| B. | by quick cooling of molten cast iron |
| C. | from white cast iron by annealing process |
| D. | none of these |
| Answer» D. none of these | |
| 118. |
Nodular cast iron is produced by adding __________ to the molten cast iron. |
| A. | nickel |
| B. | chromium |
| C. | copper |
| D. | magnesium |
| Answer» E. | |
| 119. |
Brass is an alloy of |
| A. | copper and zinc |
| B. | copper and tin |
| C. | copper, tin and zinc |
| D. | none of these |
| Answer» B. copper and tin | |
| 120. |
Iron ore is, usually, found in the form of |
| A. | oxides |
| B. | carbonates |
| C. | sulphides |
| D. | all of these |
| Answer» E. | |
| 121. |
An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and |
| A. | chromium |
| B. | silicon |
| C. | manganese |
| D. | magnesium |
| Answer» D. magnesium | |
| 122. |
White cast iron has a high tensile strength and a low compressive strength. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 123. |
Haematite iron ore contains iron about |
| A. | 30% |
| B. | 45% |
| C. | 55% |
| D. | 70% |
| Answer» E. | |
| 124. |
The steel produced by bessemer or open hearth process is __________ to that produced by L-D process. |
| A. | superior |
| B. | inferior |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 125. |
An eutectoid steel consists of |
| A. | wholly pearlite |
| B. | wholly austenite |
| C. | pearlite and ferrite |
| D. | pearlite and cementite |
| Answer» B. wholly austenite | |
| 126. |
The steel widely used for making precision measuring instruments is |
| A. | nickel steel |
| B. | nickel-chrome steel |
| C. | high speed steel |
| D. | chrome-vanadium steel |
| Answer» B. nickel-chrome steel | |
| 127. |
The red flame during the operation of a bessemer converter indicates that the |
| A. | air is burning out silicon and manganese |
| B. | silicon and manganese has burned out and carbon has started oxidising |
| C. | converter must be tilted to remove the contents of the converter |
| D. | red flame does not occur during the operation of a bessemer converter |
| Answer» E. | |
| 128. |
A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to |
| A. | 100 N/mm² |
| B. | 200 N/mm² |
| C. | 350 N/mm² |
| D. | 1000 N/mm² |
| Answer» D. 1000 N/mm² | |
| 129. |
Monel metal is an alloy of |
| A. | nickel and copper |
| B. | nickel and chromium |
| C. | nickel, chromium and iron |
| D. | copper and chromium |
| Answer» B. nickel and chromium | |
| 130. |
Martensite has needle like structure and is magnetic. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 131. |
Gamma-iron occurs between the temperature range of |
| A. | 400°C to 600°C |
| B. | 600°C to 900°C |
| C. | 900°C to 1400°C |
| D. | 1400°C to 1530°C |
| Answer» D. 1400°C to 1530°C | |
| 132. |
The phosphorus and sulphur in steel making can be removed by using basic bessemer process. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 133. |
The heat treatment process used for castings is |
| A. | carburising |
| B. | normalising |
| C. | annealing |
| D. | tempering |
| Answer» C. annealing | |
| 134. |
The portion of the blast furnace above its widest cross-section is called |
| A. | hearth |
| B. | stack |
| C. | bosh |
| D. | throat |
| Answer» C. bosh | |
| 135. |
In a crystalline material, atoms are arranged in definite and orderly manner and form. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 136. |
When a steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of |
| A. | mainly ferrite |
| B. | mainly pearlite |
| C. | ferrite and pearlite |
| D. | pearlite and cementite |
| Answer» D. pearlite and cementite | |
| 137. |
In process annealing, the hypo-eutectoid steel is |
| A. | heated from 30° C to 50° C above the upper critical temperature and then cooled in still air |
| B. | heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium |
| C. | heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace |
| D. | heated below or close to the lower critical temperature and then cooled slowly |
| Answer» E. | |
| 138. |
The essential constituent of a hardened steel is |
| A. | pearlite |
| B. | austenite |
| C. | martensite |
| D. | troostite |
| Answer» D. troostite | |
| 139. |
The quenching of steel from the upper critical point results in a fine grained structure. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 140. |
The austenite is a solid solution of carbon or iron carbide in gamma-iron. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 141. |
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 | |
| 142. |
According to Indian standard specifications, cast iron designated by 'FG 150' means |
| A. | white cast iron with B.H.N. 150 |
| B. | white cast iron with 150 MPa as minimum compressive strength |
| C. | grey cast iron with B.H.N. 150 |
| D. | grey cast iron with 150 MPa as minimum tensile strength |
| Answer» E. | |
| 143. |
Which of the following gives the correct order of increasing hot hardness of cutting tool materials? |
| A. | Diamond, Carbide, High speed steel |
| B. | Carbide, Diamond, High speed steel |
| C. | High speed steel, Carbide, Diamond |
| D. | High speed steel, Diamond, Carbide |
| Answer» D. High speed steel, Diamond, Carbide | |
| 144. |
The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as |
| A. | carburising |
| B. | cyaniding |
| C. | flame hardening |
| D. | induction hardening |
| Answer» C. flame hardening | |
| 145. |
In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled |
| A. | in still air |
| B. | slowly in the furnace |
| C. | suddenly in a suitable cooling medium |
| D. | any one of these |
| Answer» C. suddenly in a suitable cooling medium | |
| 146. |
Body centred cubic space lattice is found in |
| A. | zinc, magnesinm, cobalt, cadmium, antimony and bismuth |
| B. | gamma-iron, aluminium, copper, lead, silver and nickel |
| C. | alpha-iron, tungsten, chromium and molybdenum |
| D. | none of the above |
| Answer» D. none of the above | |
| 147. |
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 | |
| 148. |
Ferrite and pearlite makes the steel soft and ductile. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 149. |
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 | |
| 150. |
The type of space lattice found in gamma-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» B. body centred cubic space lattice | |