MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 7201. |
Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore ? |
| A. | High fusibility & fluidity. |
| B. | High thermal conductivity. |
| C. | Low density. |
| D. | High chemical activity. |
| Answer» C. Low density. | |
| 7202. |
Recrystallisation temperature of steel is __________ C. |
| A. | 50 |
| B. | 300 |
| C. | 500 |
| D. | 800 |
| Answer» E. | |
| 7203. |
Pressure required to increase the density of water by about 1% is __________ atmosphere. |
| A. | 10 |
| B. | 50 |
| C. | 200 |
| D. | 1000 |
| Answer» D. 1000 | |
| 7204. |
Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion. |
| A. | annealing |
| B. | toughening |
| C. | work hardening |
| D. | tempering |
| Answer» B. toughening | |
| 7205. |
The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the |
| A. | fatigue strength |
| B. | creep strength |
| C. | resilience |
| D. | endurance limit |
| Answer» E. | |
| 7206. |
The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm. |
| A. | 0.001 |
| B. | 0.01 |
| C. | 0.002 |
| D. | 0.02 |
| Answer» D. 0.02 | |
| 7207. |
Steel balls are manufactured by |
| A. | sintering |
| B. | casting |
| C. | cold heading |
| D. | spinning |
| Answer» D. spinning | |
| 7208. |
__________ temperature remains constant during adiabatic saturation process of unsaturated air. |
| A. | Dew point |
| B. | Dry bulb |
| C. | Wet bulb |
| D. | None of these |
| Answer» D. None of these | |
| 7209. |
The best lubricants for a machine working at high temperature & load is |
| A. | grease |
| B. | solid lubricant |
| C. | animal oils |
| D. | mineral oils |
| Answer» C. animal oils | |
| 7210. |
One face of a furnace wall is at 1030 C and the other face is exposed to room temperature (30 C). If the thermal conductivity of furnace wall is 3 W . m-1 . k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is |
| A. | 100 |
| B. | 900 |
| C. | 9000 |
| D. | 10000 |
| Answer» E. | |
| 7211. |
Tin is not present as an alloying element in |
| A. | phosphor bronze |
| B. | gun metal |
| C. | fusible metal |
| D. | white metal |
| Answer» E. | |
| 7212. |
Thermit welding uses the following energy source. |
| A. | Electrical energy. |
| B. | Chemical energy. |
| C. | Energy of high velocity electrons. |
| D. | Heat generated by friction. |
| Answer» C. Energy of high velocity electrons. | |
| 7213. |
Corrosion is |
| A. | a physical phenomenon. |
| B. | a chemical phenomenon. |
| C. | same as erosion. |
| D. | an uncontrollable phenomenon. |
| Answer» C. same as erosion. | |
| 7214. |
Which of the following is not an ore of copper? |
| A. | Cryolite |
| B. | Azurite |
| C. | Chalcopyrite |
| D. | Malachite |
| Answer» B. Azurite | |
| 7215. |
Difference at any instant between the value of the controlled variable and the set point is called the |
| A. | deviation |
| B. | derivative time |
| C. | error ratio |
| D. | differential gap |
| Answer» B. derivative time | |
| 7216. |
Out of the following, which will fracture most readity, when hit with a hard hammer ? |
| A. | Brass |
| B. | Bronze |
| C. | German silver |
| D. | Cast iron |
| Answer» E. | |
| 7217. |
A pycnometer is used for the measurement of |
| A. | flow rate of molten metal. |
| B. | specific gravity of a liquid. |
| C. | composition of alloys. |
| D. | concentration of a solution. |
| Answer» C. composition of alloys. | |
| 7218. |
Working of linear variable differential transducer (LVDT) is based on the principle of variable |
| A. | capacitance |
| B. | resistance |
| C. | mutual inductance |
| D. | none of these |
| Answer» D. none of these | |
| 7219. |
A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material? |
| A. | Steel |
| B. | Glass |
| C. | Rubber |
| D. | Brass |
| Answer» B. Glass | |
| 7220. |
Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs? |
| A. | enthalpy |
| B. | relative humidity |
| C. | wet bulb temperature |
| D. | dew point temperature |
| Answer» E. | |
| 7221. |
Which of the following metals can not be hot worked at room temperature ? |
| A. | Zinc |
| B. | Nickel |
| C. | Lead |
| D. | Tin |
| Answer» C. Lead | |
| 7222. |
__________ iron is produced by the annealing of white cast iron. |
| A. | Malleable |
| B. | Nodular |
| C. | Ductile |
| D. | Grey |
| Answer» B. Nodular | |
| 7223. |
The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the |
| A. | final control element. |
| B. | on-off control. |
| C. | floating control action. |
| D. | none of these. |
| Answer» B. on-off control. | |
| 7224. |
Fahrenheit and Centigrade scales have the same readings at |
| A. | -55 |
| B. | -40 |
| C. | -33 |
| D. | -58 |
| Answer» C. -33 | |
| 7225. |
Which of the following low melting alloy containing bismuth and lead is used for electric fuse ? |
| A. | Wood's metal |
| B. | Babbit metal |
| C. | Monel metal |
| D. | Duralumin |
| Answer» B. Babbit metal | |
| 7226. |
Water-tube boiler is the one, in which |
| A. | water passes through tubes and flue gases around it. |
| B. | tube carrying hot flue gases are immersed in a pool of water. |
| C. | tubes are placed in vertical position. |
| D. | none of these. |
| Answer» B. tube carrying hot flue gases are immersed in a pool of water. | |
| 7227. |
Which of the following is an unconventional source of energy ? |
| A. | Thermal power |
| B. | Hydroelectric power |
| C. | Nuclear-fusion power |
| D. | Solar power |
| Answer» E. | |
| 7228. |
The product (s) of roasting of a sulphide ore is (are) |
| A. | oxide only. |
| B. | sulphate only. |
| C. | oxide and sulphate. |
| D. | dependent on temperature and partial pressure of oxygen & sulphur dioxide. |
| Answer» B. sulphate only. | |
| 7229. |
Which of the following are considered applications of ultrasonic testing ? |
| A. | Determination of elastic constant. |
| B. | Detection of defects in metal. |
| C. | Measurement of material thickness. |
| D. | None of the above. |
| Answer» C. Measurement of material thickness. | |
| 7230. |
Suitability of steel for its use in cable is judged by its strength in |
| A. | tension |
| B. | compression |
| C. | torsion |
| D. | shear |
| Answer» B. compression | |
| 7231. |
Hydrogen in liquid steels is dissolved |
| A. | as tiny gas bubbles. |
| B. | in the atomic form. |
| C. | in the ionic form. |
| D. | in the molecular form. |
| Answer» B. in the atomic form. | |
| 7232. |
Baffles provided on the shell side of a shell and tube heat exchanger are meant for |
| A. | providing support for the tubes. |
| B. | improving heat transfer. |
| C. | both 'a' & 'b'. |
| D. | preventing the fouling of tubes & stagnation of shell side fluid. |
| Answer» D. preventing the fouling of tubes & stagnation of shell side fluid. | |
| 7233. |
Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are |
| A. | cobalt, chromium & tungsten, |
| B. | cobalt, chromium & nickel. |
| C. | molybdenun, tungsten & chromium. |
| D. | cobalt, zirconium & molybdenum. |
| Answer» B. cobalt, chromium & nickel. | |
| 7234. |
Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)? |
| A. | Aluminium |
| B. | Copper |
| C. | Titanium |
| D. | Stainless steel |
| Answer» D. Stainless steel | |
| 7235. |
Which of the following is an ore dressing operation ? |
| A. | Classification |
| B. | Smelting |
| C. | Roasting |
| D. | None of these |
| Answer» B. Smelting | |
| 7236. |
Gratings is associated with the measurement of |
| A. | linear displacement. |
| B. | concavity/convexity. |
| C. | surface texture. |
| D. | flatness. |
| Answer» B. concavity/convexity. | |
| 7237. |
__________ joint is mostly used for joining pipes carrying water at low pressure. |
| A. | Nipple |
| B. | Socket |
| C. | Union |
| D. | Bell and spigot |
| Answer» C. Union | |
| 7238. |
When an isolated thermodynamic system executes a process, |
| A. | work is done. |
| B. | heat transfer takes place. |
| C. | mass flow occurs across the boundary of the system. |
| D. | no chemical reaction takes place within the system. |
| Answer» E. | |
| 7239. |
Brittleness induced due to the presence of sulphur in steel can be reduced by adding |
| A. | manganese |
| B. | magnesium |
| C. | vanadium |
| D. | copper |
| Answer» B. magnesium | |
| 7240. |
Atomic __________ of an element is a whole number. |
| A. | weight |
| B. | number |
| C. | volume |
| D. | radius |
| Answer» C. volume | |
| 7241. |
The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400 D & 100 D respectively. The temperature reading corresponding to 60 C on this new temperature scale will be equal to __________ D. |
| A. | 140 |
| B. | 180 |
| C. | 240 |
| D. | 280 |
| Answer» E. | |
| 7242. |
On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal. |
| A. | frequency |
| B. | amplitude |
| C. | damping |
| D. | none of these |
| Answer» B. amplitude | |
| 7243. |
Fire refining process is employed in case of |
| A. | tin |
| B. | copper |
| C. | zinc |
| D. | aluminium |
| Answer» C. zinc | |
| 7244. |
Larger length & diameter water pipes are made by |
| A. | electrical resistance welding. |
| B. | die casting. |
| C. | semi-centrifugal casting. |
| D. | continuous casting. |
| Answer» D. continuous casting. | |
| 7245. |
The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the |
| A. | critical point. |
| B. | curie temperature. |
| C. | inversion temperature. |
| D. | eutectic temperature. |
| Answer» C. inversion temperature. | |
| 7246. |
Primary designation of steel is based on its |
| A. | hardness & tensile strength. |
| B. | carbon content. |
| C. | iron content. |
| D. | alloying elements content. |
| Answer» E. | |
| 7247. |
Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel. |
| A. | wrought |
| B. | tool |
| C. | alloy |
| D. | plain carbon |
| Answer» E. | |
| 7248. |
Dephosphorisation of molten pig iron is favoured by |
| A. | oxidising and basic slag. |
| B. | reducing and basic slag. |
| C. | high activity co-efficient of phosphorous in metal. |
| D. | oxidising and neutral slag. |
| Answer» C. high activity co-efficient of phosphorous in metal. | |
| 7249. |
Which of the following commonly used condenser tube materials has the lowest thermal conductivity? |
| A. | Admirability brass. |
| B. | Stainless steel. |
| C. | Aluminium brass. |
| D. | Titanium. |
| Answer» C. Aluminium brass. | |
| 7250. |
Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism. |
| A. | fracture |
| B. | dislocation |
| C. | slip |
| D. | twinning |
| Answer» D. twinning | |