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.
| 7651. |
The quantity of electricity required to deposit one gm equivalent of any substance is one |
| A. | ampere |
| B. | coulomb |
| C. | microfaraday |
| D. | faraday |
| Answer» E. | |
| 7652. |
Surface tension is due to the __________ forces. |
| A. | viscous |
| B. | adhesive |
| C. | cohesive |
| D. | difference between adhesive & cohesive |
| Answer» E. | |
| 7653. |
Metals in general have a low value of thermal |
| A. | conductivity |
| B. | diffusivity |
| C. | inertia |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 7654. |
Pick out the wrong statement: |
| A. | Soft water is more corrosive than that carrying calcium salts. |
| B. | The corrosion of brass condenser tubes handling brine solution is also termed as 'dezincification'. |
| C. | Non-annealed brass is highly susceptible to season cracking (i.e., inter-crystal corrosion due to internal stresses). |
| D. | Pure copper is highly susceptible to stress corrosion. |
| Answer» E. | |
| 7655. |
The tensile strength of plastics ranges from __________ kg/mm2. |
| A. | 10 to 50 |
| B. | 50 to 100 |
| C. | 0.01 to 0.1 |
| D. | 0.1 to 10 |
| Answer» E. | |
| 7656. |
Grain hardness is measured by the __________ hardness testing method. |
| A. | Knoop |
| B. | Rockwell F |
| C. | Shore sceleroscope |
| D. | Vicker's |
| Answer» B. Rockwell F | |
| 7657. |
The thermal efficiency of a heat engine giving an output of 4 KW with an input of 10000 Joules/sec is __________ percent. |
| A. | 40 |
| B. | 80 |
| C. | 10 |
| D. | 25 |
| Answer» B. 80 | |
| 7658. |
Pick out the wrong statement about nucleate boiling. |
| A. | Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface. |
| B. | Surface temperature is greater than the saturation temperature of the liquid. |
| C. | Heat transfer from the surface of the liquid is less than that in film boiling. |
| D. | The temperature is less than that of film boiling. |
| Answer» E. | |
| 7659. |
L.D. (Linz-Donawitz) converter is used in the production of |
| A. | copper |
| B. | steel |
| C. | zinc |
| D. | aluminium |
| Answer» C. zinc | |
| 7660. |
Turning/machining of __________ usually does not require any cutting fluid. |
| A. | cast iron |
| B. | stainless steel |
| C. | mild steel |
| D. | copper |
| Answer» B. stainless steel | |
| 7661. |
Powder metallurgy processing can be used for making |
| A. | dispersion strengthened copper rod. |
| B. | self lubricating bearing and cemented carbide. |
| C. | connecting rod. |
| D. | piston. |
| Answer» C. connecting rod. | |
| 7662. |
In 18-4-1 high speed steel, 18, 4 & 1 respectively denote the percentage of |
| A. | chromium, tungsten & vanadium. |
| B. | tungsten, chromium & vanadium. |
| C. | tungsten, vanadium & chromium. |
| D. | tungsten, chromium & molybdenum. |
| Answer» C. tungsten, vanadium & chromium. | |
| 7663. |
Role of a "collector" in froth floatation is to |
| A. | form a water repelling film on the mineral surface. |
| B. | create and stabilise the froth. |
| C. | act as a surface. |
| D. | collect the minerals according to their specific gravity. |
| Answer» B. create and stabilise the froth. | |
| 7664. |
For the running of power generating turbines, the steam used should be |
| A. | wet |
| B. | superheated |
| C. | at ordinary pressure |
| D. | none of these |
| Answer» C. at ordinary pressure | |
| 7665. |
Creep consideration is the most important in case of the |
| A. | blades of gas turbines. |
| B. | steam engine flywheel. |
| C. | cast iron pipes. |
| D. | cycle chains. |
| Answer» B. steam engine flywheel. | |
| 7666. |
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10-16 m2 . S-1 and it is 1.94 x 10-14 m2 S-1 at 1200 K. The activation energy (in k. J.mole-1 ) for the diffusion of Ni in Cu is |
| A. | 130 |
| B. | 180 |
| C. | 230 |
| D. | 250 |
| Answer» D. 250 | |
| 7667. |
Hardness & tensile strength of austenitic stainless steel can be increased by |
| A. | martempering |
| B. | cold working |
| C. | normalising |
| D. | hardening |
| Answer» C. normalising | |
| 7668. |
Which of the following metals occurs in nature in their free metallic state ? |
| A. | Au & Ag |
| B. | Pb & Zn |
| C. | Cu & Ni |
| D. | none of these |
| Answer» E. | |
| 7669. |
The most suitable material for a sewer for carrying storm water is |
| A. | asbestos cement |
| B. | cast iron |
| C. | mild steel |
| D. | cement concrete |
| Answer» E. | |
| 7670. |
The magnitude of water hammer caused in pipe flow is independent of the |
| A. | pipe length. |
| B. | fluid flow stoppage rate. |
| C. | fluid temperature. |
| D. | time of valve closure. |
| Answer» D. time of valve closure. | |
| 7671. |
A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid ? |
| A. | Arsenic |
| B. | Antimony |
| C. | Lead |
| D. | none of these |
| Answer» D. none of these | |
| 7672. |
No cutting fluid is normally used, while machining |
| A. | cast iron |
| B. | aluminium |
| C. | mild steel |
| D. | stainless steel |
| Answer» B. aluminium | |
| 7673. |
Which of the following is a disaccharide? |
| A. | Lactose |
| B. | Starch |
| C. | Cellulose |
| D. | Fructose |
| Answer» B. Starch | |
| 7674. |
Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity. |
| A. | 50 |
| B. | 250 |
| C. | 450 |
| D. | 850 |
| Answer» D. 850 | |
| 7675. |
Ceramic tips for the cutting tool are prepared from __________ powder. |
| A. | carbon |
| B. | silicon carbide |
| C. | aluminium oxide |
| D. | tungsten |
| Answer» D. tungsten | |
| 7676. |
Fatigue strength of a metal is improved by |
| A. | overstressing. |
| B. | scratching the surface. |
| C. | raising the temperature. |
| D. | understressing. |
| Answer» E. | |
| 7677. |
Saturated steam at a pressure of 25 kg/cm2 is throttled to attain 5 kg/cm2 . Then the outcoming steam will be |
| A. | wet |
| B. | saturated |
| C. | superheated |
| D. | none of these |
| Answer» D. none of these | |
| 7678. |
An "orange peel" effect is observed |
| A. | as a defect during metal casting/ welding. |
| B. | during deep drawing of metallic sheet having large grain size. |
| C. | during faulty heat treatment of steel. |
| D. | during extrusion of metal through a die. |
| Answer» C. during faulty heat treatment of steel. | |
| 7679. |
Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ? |
| A. | Copper |
| B. | Zinc |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 7680. |
If a heat transfer surface is pock-marked with a number of cavities, then as compared to a smooth surface the heat transfer by __________ will not increase. |
| A. | convection |
| B. | nucleate boiling |
| C. | radiation |
| D. | conduction |
| Answer» B. nucleate boiling | |
| 7681. |
Piezoelectric is a material |
| A. | whose properties is midway between the constituent materials. |
| B. | which gets polarised, when stressed. |
| C. | in which magnetising force reduces when current flowing through it is in-cresed. |
| D. | which changes dimensions due to applied field. |
| Answer» C. in which magnetising force reduces when current flowing through it is in-cresed. | |
| 7682. |
Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure. |
| A. | 18 |
| B. | 16 |
| C. | 14 |
| D. | 12 |
| Answer» C. 14 | |
| 7683. |
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. | |
| 7684. |
Coke is added in the blast furnace to |
| A. | reduce & melt the iron ore. |
| B. | increase the fluidity of slag. |
| C. | remove sulphur & phosphorus from molten metal. |
| D. | none of these. |
| Answer» B. increase the fluidity of slag. | |
| 7685. |
A balanced draught boiler furnace employs __________ draught fan. |
| A. | induced |
| B. | forced |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 7686. |
Aluminium oxide (an abrasive) is used for grinding |
| A. | ceramics |
| B. | high speed steel |
| C. | cemented carbide |
| D. | none of these |
| Answer» C. cemented carbide | |
| 7687. |
In a casting, cold shut defect is caused by |
| A. | low pounhg temperature. |
| B. | melt-mould reactions. |
| C. | faulty gating system. |
| D. | very low mould permeability. |
| Answer» B. melt-mould reactions. | |
| 7688. |
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when |
| A. | cheap electricity is available. |
| B. | the precious metal content of copper is high. |
| C. | there is a demand for ultrapure (99.99%) electrolytic copper. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 7689. |
Out of the following, the dimensionless quantity is |
| A. | specific weight |
| B. | viscosity |
| C. | Mach number |
| D. | density |
| Answer» D. density | |
| 7690. |
Shock resisting steels should possess high |
| A. | hardness |
| B. | toughness |
| C. | tensile strength |
| D. | wear resistance |
| Answer» D. wear resistance | |
| 7691. |
Fatigue life is expected to increase by |
| A. | increasing the size of the sample. |
| B. | smooth polishing of the surface of the sample. |
| C. | having compressive residual stresses at the surface. |
| D. | having tensile residual stresses at the surface. |
| Answer» D. having tensile residual stresses at the surface. | |
| 7692. |
Specific __________ is a dimensionless quantity. |
| A. | heat |
| B. | humidity |
| C. | weight |
| D. | none of these |
| Answer» E. | |
| 7693. |
__________ is not used as the control rod material in a nuclear reactor. |
| A. | Cobalt |
| B. | Hafnium |
| C. | Cadmium |
| D. | Boron |
| Answer» B. Hafnium | |
| 7694. |
Superheated vapour behaves like |
| A. | dry steam |
| B. | gas approximately |
| C. | an ordinary vapor |
| D. | none of these |
| Answer» C. an ordinary vapor | |
| 7695. |
Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position. |
| A. | horizontal |
| B. | vertical |
| C. | inclined |
| D. | any |
| Answer» E. | |
| 7696. |
Often earing defects are found during deep drawing operation, because the |
| A. | surface finish of the sheet is poor. |
| B. | sheet material has been given substantial spring back. |
| C. | starting sheet has planer anisotropy due to its texture. |
| D. | starting sheet has normal anitropy due to its texture. |
| Answer» D. starting sheet has normal anitropy due to its texture. | |
| 7697. |
Which one can be directly solidified from gaseous state wihtout entering into liquid state ? |
| A. | Helium |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | None of these |
| Answer» D. None of these | |
| 7698. |
Batch process is preferred over continuous process, when the |
| A. | product yields and quality can not be achieved in continuous process, because of long residence time. |
| B. | sales demand of product is not steady. |
| C. | same equipment can not be used for several processes of the same nature. |
| D. | all (a), (b) & (c) |
| Answer» C. same equipment can not be used for several processes of the same nature. | |
| 7699. |
Hot & cold working of material causes its __________ deformation. |
| A. | visco-elastic |
| B. | isotropic |
| C. | elastic |
| D. | plastic |
| Answer» E. | |
| 7700. |
In a fuel cell, chemical energy is converted into |
| A. | electrical energy directly. |
| B. | mechanical energy. |
| C. | electrical energy and stored therein. |
| D. | none of these. |
| Answer» B. mechanical energy. | |