

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
201. |
In grey cast iron, carbon is present in the form of |
A. | Cementite |
B. | Flakes |
C. | Powder |
D. | Spheroids |
E. | None of the above |
Answer» B. Flakes |
202. |
Which of the following affects the hardenability of steel? |
A. | Austenitic composition |
B. | Austenitic grain size |
C. | Amount, nature and distribution of undissolved or insoluble particles in austenite |
D. | All of the above |
E. | Low specific heat of quenching oil |
Answer» D. All of the above |
203. |
Electric process for steel making is used in which of the following steel plant? |
A. | Bhilai |
B. | Bokaro |
C. | Durgapur |
D. | TISCO |
E. | None of the above |
Answer» E. None of the above |
204. |
In a diamagnetic material the effect of an applied magnetic field is that |
A. | A net dipole moment is induced in the material |
B. | There is a net reduction in flux density |
C. | The induced magnetism is in opposition to applied field |
D. | All of the above |
E. | None of the above |
Answer» D. All of the above |
205. |
In tool steel the percentage of silicon is usually restricted to |
A. | 1 percent |
B. | 2 percent |
C. | 0.5 percent |
D. | 0.2 percent |
E. | 5 percent |
Answer» D. 0.2 percent |
206. |
The highest rate of quenching is possible in |
A. | Cold furnace |
B. | Oil |
C. | Air |
D. | Water |
E. | Hot furnace |
Answer» D. Water |
207. |
There are 14 atoms in a unit cell of |
A. | Body centred cubic space lattice |
B. | Face centred cubic space lattice |
C. | Close packed hexagonal space lattice |
D. | All of the above |
E. | None of the above |
Answer» B. Face centred cubic space lattice |
208. |
Coarse grained steels |
A. | Are less tough |
B. | Are less liable to distortion |
C. | Have poor machinability |
D. | Have leser depth hardening power |
E. | None of the above |
Answer» A. Are less tough |
209. |
Normal mercury thermometer can be used upto |
A. | 300?C |
B. | 500?C |
C. | 100?C |
D. | 800?C |
E. | 212?C |
Answer» A. 300?C |
210. |
During heat treatment the formation of thick layer of scale on the surface of steel articles is mainly due to |
A. | oxidation |
B. | excessive hardness |
C. | Low specific heat of quenching oil |
D. | coarse grain structure |
E. | reduction |
Answer» A. oxidation |
211. |
Ultimate tensile strength is least in case of |
A. | Cast iron |
B. | Mild steel |
C. | Wrought iron |
D. | High carbon steel |
E. | Low carbon steel |
Answer» A. Cast iron |
212. |
An instrument which is used for measuring temperature variations by change in a metallic resistance is called a |
A. | thermo-generator |
B. | Thermo-galvanometer |
C. | Thennocouple |
D. | Thermopile |
E. | Bolometer |
Answer» E. Bolometer |
213. |
White metal contains |
A. | Mercury and zinc |
B. | Copper, zinc and mercury |
C. | Lead and copper |
D. | Lead and bismuth |
E. | Lead and zinc |
Answer» D. Lead and bismuth |
214. |
For acid resistance cast iron should have silicon percentage of |
A. | 1 percent |
B. | 15 percent |
C. | 10 percent |
D. | 25 percent |
E. | 2 percent |
Answer» B. 15 percent |
215. |
Which of the following gives granular fracture? |
A. | Steel |
B. | Wrought iron |
C. | Cast iron |
D. | All of the above |
E. | None of the above |
Answer» A. Steel |
216. |
The crystal structure of alpha iron is |
A. | BCC |
B. | FCC |
C. | HCC |
D. | Cubic |
E. | None of the above |
Answer» A. BCC |
217. |
Which of the following operation on grey cast iron will result in the production of white cast iron? |
A. | Rapid heating |
B. | Tumbling |
C. | Tempering |
D. | Shot peening |
E. | Rapid cooling |
Answer» A. Rapid heating |
218. |
A solder consists of |
A. | Tin and antimony |
B. | Tin and white metal |
C. | Lead and tin |
D. | Zinc and lead |
E. | Zinc and tin |
Answer» C. Lead and tin |
219. |
Ferrites are a sub-group of |
A. | Ferromagnetic materials |
B. | Ferrimagnetic materials |
C. | Diamagnetic materials |
D. | Paramagnetic materials |
E. | None of the above |
Answer» B. Ferrimagnetic materials |
220. |
Which of the following material is added to cast iron to obtain nodular cast iron? |
A. | Chromium |
B. | Copper |
C. | Magnesium |
D. | Manganese |
E. | Molybdenum |
Answer» C. Magnesium |
221. |
Pure iron has the structure of |
A. | Ferrite |
B. | Pearlite and austenite |
C. | Pearlite |
D. | Austenite |
E. | Pearlite, austenite and ferrite |
Answer» A. Ferrite |
222. |
A hardness value of 1400 BHN can be expected in case of |
A. | Cementite |
B. | Ferrite |
C. | Pearlite |
D. | All of the above |
E. | None of the above |
Answer» A. Cementite |
223. |
During first charge in cupola the time taken by material to melt is approximately |
A. | 2 |
B. | 5 to 6 hours |
C. | 10 minutes |
D. | 1 hour |
E. | Half an hour |
Answer» A. 2 |
224. |
Chromium percentage in cutlery stainless steel is |
A. | 11 - 13 percent |
B. | 18 - 20.5 percent |
C. | 6 - 8 percent |
D. | 15 - 18 percent |
E. | 8 - 10 percent |
Answer» E. 8 - 10 percent |
225. |
Percentage of carbon is least in case of |
A. | Pig iron |
B. | Wrought iron |
C. | Malleable iron |
D. | Cast iron |
E. | Steel |
Answer» B. Wrought iron |
226. |
Slow plastic deformation of metals under a constant stress is known as |
A. | Endurance failure |
B. | Proof deformation |
C. | Creep |
D. | Gradual deformation |
E. | Fatigue |
Answer» C. Creep |
227. |
The chemical formula of cementite is |
A. | FeC3 |
B. | Fe2C3 |
C. | FeC |
D. | Fe3C2 |
E. | Fe3C |
Answer» E. Fe3C |
228. |
A steel specimen is heated to 730?C and cooled at the slowest possible rate in the furnace. Which property will be imparted to the steel piece? |
A. | Low specific heat of quenching oil |
B. | Tempering |
C. | Softness |
D. | Toughness |
E. | Hardness |
Answer» C. Softness |
229. |
Insufficient hardness after tempering may be due to |
A. | tempering temperature too low |
B. | tempering temperature too high |
C. | oxidising atmosphere in the furnace |
D. | Any of the above |
E. | Low specific heat of quenching oil |
Answer» B. tempering temperature too high |
230. |
Which of the following element has hexagonal close packed structure? |
A. | Molybdenum |
B. | Cadmium |
C. | Chromium |
D. | Lead |
E. | Aluminium |
Answer» B. Cadmium |
231. |
Brass in an alloy of |
A. | Copper and lead |
B. | Copper and tin |
C. | Copper and nickel |
D. | Copper and aluminium |
E. | Copper and zinc |
Answer» E. Copper and zinc |
232. |
Which of the following metals has highest specific gravity? |
A. | Silver |
B. | Copper |
C. | Iron |
D. | Aluminium |
E. | Brass |
Answer» A. Silver |
233. |
Which of the following material is generally not used as deoxidiser for producing killed steel? |
A. | Copper |
B. | Ferro-silicon |
C. | Ferro-manganese |
D. | Aluminium |
E. | All of the above |
Answer» A. Copper |
234. |
The net magnetic moment is zero is case of |
A. | Ferromagnetic materials |
B. | Ferrimagnetic materials |
C. | Anti-ferromagnetic materials |
D. | All of the above |
E. | None of the above |
Answer» C. Anti-ferromagnetic materials |
235. |
In Brinell hardness tester the load for aluminium is |
A. | 1000 kg |
B. | 500 kg |
C. | 300 kg |
D. | 100 kg |
E. | 1500 kg |
Answer» B. 500 kg |
236. |
The nature of atomic bond found in diamond is |
A. | Ionic |
B. | Covalent |
C. | Metallic |
D. | Either of above |
E. | None of the above |
Answer» B. Covalent |
237. |
Annealing treatment is normally used for |
A. | Forgings |
B. | Cold worked sheets |
C. | Wires |
D. | Castings |
E. | All of the above |
Answer» E. All of the above |
238. |
During dielectric heating, the heat is generated primarily due to |
A. | Eddy currents |
B. | High voltage |
C. | High flux density |
D. | High power consumption |
E. | Stray magnetic fields |
Answer» A. Eddy currents |
239. |
For each ton of pig iron produced in a blast furnace, the amount of ore used is approximately. |
A. | 1 ton |
B. | 13 tons |
C. | 5 tons |
D. | 2 tons |
E. | 12.5 tons |
Answer» D. 2 tons |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.