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MCQOPTIONS
This section includes 2253 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1751. |
Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to$ |
| A. | achieve very high purity of aluminium (99.9%). |
| B. | keep the electrolyte in liquid condition by the generation of heat. |
| C. | electrolytically dissociate alumina. |
| D. | both(b) & (c). |
| Answer» E. | |
| 1752. |
An example of unsteady non uniform flow is the flow of liquid under pressure through a |
| A. | tapering pipe at constant flow rate. |
| B. | tapering pipe at either decreasing or increasing flow rate. |
| C. | long pipeline of constant diameter. |
| D. | none of these. |
| Answer» C. long pipeline of constant diameter. | |
| 1753. |
Compressed dry air is used as the cutting fluid, while machining |
| A. | steel |
| B. | cast iron |
| C. | aluminium |
| D. | none of these |
| Answer» C. aluminium | |
| 1754. |
Identify the correct statement with reference to the extractive metallurgy of aluminium. |
| A. | The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3. |
| B. | Approximately 80% of the aluminium deposited on the cathode comes from cryolite. |
| C. | Sodium is deposited along with aluminium, but is immediately vaporised. |
| D. | Anode effect sets in when the cryolite concentration goes below 40%. |
| Answer» B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite. | |
| 1755. |
Steel & cast iron pipes are produced by __________ casting. |
| A. | slush |
| B. | die |
| C. | investment |
| D. | true centrifugal |
| Answer» E. | |
| 1756. |
Material having maximum density is |
| A. | plutonium |
| B. | osmium |
| C. | titanium |
| D. | uranium |
| Answer» C. titanium | |
| 1757. |
The most commonly used moderator in nuclear power plants is |
| A. | graphite |
| B. | light water |
| C. | heavy water |
| D. | berellium |
| Answer» B. light water | |
| 1758. |
Leakage in a cooking gas cylinder is detected by |
| A. | radio-isotopes. |
| B. | pouring soap solution on the surface and locating the gas bubbles. |
| C. | halide torch. |
| D. | pungent smell of mercaptans present in the gas. |
| Answer» E. | |
| 1759. |
It is possible to form martensite |
| A. | sometimes by cold working. |
| B. | sometimes without nucleation. |
| C. | sometimes by gas quenching. |
| D. | only in iron based alloys. |
| Answer» E. | |
| 1760. |
Pick the odd man out. |
| A. | Austempering |
| B. | Martempering |
| C. | Cyniding |
| D. | Parkerizing |
| Answer» E. | |
| 1761. |
Statistical quality control was developed by __________ , an American scientist during world war II. |
| A. | Water shewhart |
| B. | Fredric Taylor |
| C. | John Wright |
| D. | Woolmer |
| Answer» B. Fredric Taylor | |
| 1762. |
Which of the following welding processes employs the highest welding temperature ? |
| A. | Arc welding |
| B. | Gas welding |
| C. | Thermit welding |
| D. | Resistance welding |
| Answer» E. | |
| 1763. |
The maximum percentage of chromium that can be added to steel is about |
| A. | 12 |
| B. | 18 |
| C. | 24 |
| D. | 30 |
| Answer» C. 24 | |
| 1764. |
The hydraulic radius of a circular pipe of diameter 'd' flowing full is |
| A. | d/4 |
| B. | d/2 |
| C. | 2d/3 |
| D. | d/3 |
| Answer» B. d/2 | |
| 1765. |
A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to |
| A. | particle diameter |
| B. | particle diameter |
| C. | (particle diameter)2 |
| D. | (particle diameter)3 |
| Answer» C. (particle diameter)2 | |
| 1766. |
With increase in __________ Knocking tendency in a spark ignition petrol engine decreases. |
| A. | supercharging |
| B. | wall temperature |
| C. | compression ratio |
| D. | engine speed |
| Answer» E. | |
| 1767. |
The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron? |
| A. | 159 |
| B. | 1837 |
| C. | 2537 |
| D. | 10000 |
| Answer» D. 10000 | |
| 1768. |
__________ 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 | |
| 1769. |
Coating of zinc over steel is known as |
| A. | cladding |
| B. | galvanising |
| C. | anodising |
| D. | passivation |
| Answer» C. anodising | |
| 1770. |
The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment. |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.6 |
| D. | 0.8 |
| Answer» B. 0.4 | |
| 1771. |
A form of stress corrosion failure termed as 'season cracking' is generally observed in |
| A. | thermosetting polymers. |
| B. | high carbon steels. |
| C. | brasses. |
| D. | borosilicate glasses. |
| Answer» D. borosilicate glasses. | |
| 1772. |
Energy required to compress a hot gas as compared to cold gas will be |
| A. | more. |
| B. | less. |
| C. | same. |
| D. | more or less depending upon the nature of the gas. |
| Answer» B. less. | |
| 1773. |
A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.$ |
| A. | 370 |
| B. | 340 |
| C. | 320 |
| D. | 300 |
| Answer» B. 340 | |
| 1774. |
An engineer's hammer is made of high __________ steel. |
| A. | carbon |
| B. | speed |
| C. | silicon |
| D. | chromium |
| Answer» B. speed | |
| 1775. |
__________ is used for tying the steel coloumns to concrete foundation. |
| A. | Grouting |
| B. | Eyebolt |
| C. | Anchor bolts |
| D. | Refractory castables |
| Answer» D. Refractory castables | |
| 1776. |
With increase in pressure, the latent heat of steam |
| A. | increases. |
| B. | decreases. |
| C. | remains unchanged. |
| D. | data insufficient; can't be predicted. |
| Answer» C. remains unchanged. | |
| 1777. |
Aluminium is extracted from |
| A. | chalcocite |
| B. | bauxite |
| C. | galena |
| D. | none of these |
| Answer» C. galena | |
| 1778. |
Optical activity is a/an __________ property. |
| A. | additive |
| B. | constitutive |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 1779. |
Annealing of metal does not |
| A. | precede its wire drawing. |
| B. | induce softness and removes stresses & dissolved gases. |
| C. | refine the crystalline structure & produce a definite microstructure. |
| D. | alter toughness, ductility and magnetic & electrical or other physical properties. |
| Answer» B. induce softness and removes stresses & dissolved gases. | |
| 1780. |
According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point is |
| A. | 180° |
| B. | 212° |
| C. | 32° |
| D. | 273° |
| Answer» B. 212¬∞ | |
| 1781. |
The thickness of oxide film is y at time t. If K1, K2 and K3 are the temperature dependent constants, the parabolic law of oxidation is given by |
| A. | y2 = 2k1t + k2 |
| B. | y = k1 ln (k2t + k3) |
| C. | y = k1 t + k2 |
| D. | y = k1t3 + k2 |
| Answer» B. y = k1 ln (k2t + k3) | |
| 1782. |
High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.$ |
| A. | 5 to 10 |
| B. | 15 to 25 |
| C. | 45 to 50 |
| D. | 75 to 80 |
| Answer» D. 75 to 80 | |
| 1783. |
Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ? |
| A. | Galvanising |
| B. | Tinning |
| C. | Sheardising |
| D. | none of these |
| Answer» D. none of these | |
| 1784. |
Ignition of fuel in a diesel engine is by |
| A. | spark |
| B. | hot compressed air |
| C. | fuel injection |
| D. | none of these |
| Answer» C. fuel injection | |
| 1785. |
Cathodic protection is widely used in controlling corrosion in |
| A. | high pressure vessels. |
| B. | marine structure & underground pipelines. |
| C. | overhead fuel gas pipelines. |
| D. | overhead water pipelines. |
| Answer» C. overhead fuel gas pipelines. | |
| 1786. |
Cascade control is |
| A. | the continuous adjustment of the set point index of an automatic control loop by a primary (master) controller. |
| B. | used when changes in process conditions cause serious upsets in the controlled variable. |
| C. | useful to control flow from temperature. |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 1787. |
Carbon percentage in high speed steel tool material is 0.6 to 1.0. The hardness of carbon tool steels is increased, when it is alloyed with |
| A. | vanadium & chromium |
| B. | silicon |
| C. | tungsten |
| D. | manganese |
| Answer» B. silicon | |
| 1788. |
One of the methods of purification of leach liquor is ion exchange, which involves |
| A. | exchange between two liquid phases. |
| B. | exchange between a gaseous phase and a liquid phase. |
| C. | exchange between a liquid phase and an organic resin phase. |
| D. | exchange between a solid phase and a gas phase. |
| Answer» D. exchange between a solid phase and a gas phase. | |
| 1789. |
Work done by a/an __________ process is determined by. |
| A. | adiabatic |
| B. | quasi-static |
| C. | isothermal |
| D. | isentropic |
| Answer» C. isothermal | |
| 1790. |
Which of the following is not a ferromagnetic material ? |
| A. | Nickel |
| B. | Cobalt |
| C. | Aluminium |
| D. | Iron |
| Answer» D. Iron | |
| 1791. |
Surface tension of a liquid |
| A. | is due to intermolecular forces of cohesion. |
| B. | decreases with rise in temperature. |
| C. | is responsible for the spherical shape of an isolated liquid drop. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 1792. |
For hardening high alloy steel, it is to be heated slowly and uniformly to avoid |
| A. | local hardening |
| B. | scale formation |
| C. | segregation |
| D. | warpage |
| Answer» E. | |
| 1793. |
Fire on fuel oil lines can be extinguished by |
| A. | foam |
| B. | steam |
| C. | water |
| D. | carbon dioxide |
| Answer» B. steam | |
| 1794. |
Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C.$ |
| A. | -30.5 |
| B. | -78.5 |
| C. | -183.5 |
| D. | -10.5 |
| Answer» C. -183.5 | |
| 1795. |
Lubricants can be used to |
| A. | transmit power hydraulically. |
| B. | form a seal in compressors. |
| C. | remove contaminants by flushing and to insulate transformers, switchgears etc. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 1796. |
The preferred alloying element for low temperature applications of steel is |
| A. | Cr |
| B. | N |
| C. | Mo |
| D. | Ni |
| Answer» E. | |
| 1797. |
Which of the following has the least value of ultimate tensile strength (UTS) ? |
| A. | Medium carbon steel |
| B. | High carbon steel |
| C. | Cast iron |
| D. | Wrought iron |
| Answer» C. Cast iron | |
| 1798. |
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 | |
| 1799. |
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type |
| A. | parallel flow with equal heat capacities. |
| B. | counter flow with equal heat capacities. |
| C. | counter flow with unequal heat capacities. |
| D. | parallel flow with unequal heat capacities. |
| Answer» C. counter flow with unequal heat capacities. | |
| 1800. |
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling. |
| A. | film |
| B. | nucleate |
| C. | transition |
| D. | all modes of |
| Answer» E. | |