MCQOPTIONS
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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.
| 701. |
All of the following alloying elements of steel increases hardness but sacrifice ductility, except________________? |
| A. | Nickel |
| B. | Vanadium |
| C. | Molybdenum |
| D. | Chromium |
| Answer» B. Vanadium | |
| 702. |
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________? |
| A. | Very low which prevents their ignition by compression |
| B. | Very high which prevents their ignition by compression |
| C. | Zero |
| D. | None of these |
| Answer» B. Very high which prevents their ignition by compression | |
| 703. |
Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be________________? |
| A. | 9.5 : 1 |
| B. | 12.5 : 1 |
| C. | 15.5 : 1 |
| D. | 18.5 : 1 |
| Answer» B. 12.5 : 1 | |
| 704. |
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________? |
| A. | 9 : 1 |
| B. | 17 : 1 |
| C. | 23 : 1 |
| D. | 29 : 1 |
| Answer» C. 23 : 1 | |
| 705. |
Air standard Otto cycle is more efficient than the diesel cycle for the same__________________? |
| A. | Heat addition & compression ratio |
| B. | Heat addition & pressure |
| C. | Compression ratio & pressure |
| D. | Cylinder dimension & rpm |
| Answer» B. Heat addition & pressure | |
| 706. |
Air-petrol ratio in an automotive petrol engine is around ________________? |
| A. | 14 : 1 |
| B. | 22 : 1 |
| C. | 25 : 1 |
| D. | 4 : 1 |
| Answer» B. 22 : 1 | |
| 707. |
Age hardening is connected with________________? |
| A. | Babbitt metal |
| B. | Gun metal |
| C. | Stainless steel |
| D. | Duralumin |
| Answer» E. | |
| 708. |
Adhesives__________________? |
| A. | Can’t be used in the form of pressure sensitive tapes |
| B. | Can’t join two dissimilar metals |
| C. | Cure instantaneously after application on a surface |
| D. | None of these |
| Answer» E. | |
| 709. |
Addition of _____________________ to steel does not impart hardness? |
| A. | Nickel |
| B. | Copper |
| C. | Chromium |
| D. | Silicon |
| Answer» C. Chromium | |
| 710. |
Addition of ____________________ to steel does not help in improving its machinability? |
| A. | Sulphur |
| B. | Silicon |
| C. | Lead |
| D. | Phosphorous |
| Answer» C. Lead | |
| 711. |
Addition of _______________ to steel does not help in improving its machinability ? |
| A. | Sulphur |
| B. | Silicon |
| C. | Lead |
| D. | Phosphorous |
| Answer» C. Lead | |
| 712. |
According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is__________________? |
| A. | 180° |
| B. | 212° |
| C. | 32° |
| D. | 273° |
| Answer» B. 212° | |
| 713. |
According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to _______________ times the yield stress ? |
| A. | 0.5 |
| B. | 2 |
| C. | √2 |
| D. | √3/2 |
| Answer» B. 2 | |
| 714. |
Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at________________? |
| A. | High vacuum |
| B. | Zero pressure |
| C. | 0°K |
| D. | Earth’s centre |
| Answer» C. 0°K | |
| 715. |
Absolute zero pressure can be attained at a temperature of___________________? |
| A. | 0°C |
| B. | 50°K |
| C. | 0°R |
| D. | None of these |
| Answer» D. None of these | |
| 716. |
A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ? |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 717. |
A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place_________________? |
| A. | The better insulation material should be put just next to pipe (i.e., inside) |
| B. | The better insulating material should be put outside |
| C. | Either of the insulating material could be put on either side |
| D. | Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe) |
| Answer» B. The better insulating material should be put outside | |
| 718. |
A spring material should have low__________________? |
| A. | Elastic limit |
| B. | Deflection value |
| C. | Fatigue resistance |
| D. | None of these |
| Answer» E. | |
| 719. |
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 | |
| 720. |
A solar cell converts the sunlight directly into ______________ energy? |
| A. | Thermal |
| B. | Electrical |
| C. | Mechanical |
| D. | Chemical |
| Answer» C. Mechanical | |
| 721. |
A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in _______________ electrons ? |
| A. | Lack of free |
| B. | Excess of |
| C. | Decrease in |
| D. | None of these |
| Answer» C. Decrease in | |
| 722. |
A reduction in thermal resistance during heat transfer does not occur in the___________________? |
| A. | Convection heat transfer by stirring the fluid and cleaning the heating surface |
| B. | Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity |
| C. | Radiation heat transfer by increasing the temperature and reducing the emissivity |
| D. | None of these |
| Answer» D. None of these | |
| 723. |
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 | |
| 724. |
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 | |
| 725. |
A metal having a Poisson’s ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is________________? |
| A. | -0.8 |
| B. | 0.8 |
| C. | +0.08 |
| D. | -0.24 |
| Answer» E. | |
| 726. |
A material subjected ________________ must have high resilience? |
| A. | Shock loading |
| B. | Vibration |
| C. | Fatigue |
| D. | Tension |
| Answer» B. Vibration | |
| 727. |
A material is capable of resisting softening at high temperature, because of its property termed as____________________? |
| A. | Hot temper |
| B. | Hot hardness |
| C. | Fatigue |
| D. | Creep |
| Answer» C. Fatigue | |
| 728. |
A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’; an example of which is_________________? |
| A. | Lead |
| B. | Glass |
| C. | Mica |
| D. | Silver |
| Answer» B. Glass | |
| 729. |
A material being tested for endurance strength is subjected to the _______________ load ? |
| A. | Impact |
| B. | Completely reversed |
| C. | Dynamic |
| D. | Static & dynamic |
| Answer» C. Dynamic | |
| 730. |
A material being tested for endurance strength is subjected to the _____________ load? |
| A. | Impact |
| B. | Completely reversed |
| C. | Dynamic |
| D. | Static & dynamic |
| Answer» C. Dynamic | |
| 731. |
A jig is used while __________________ a hole? |
| A. | Boring |
| B. | Counter boring |
| C. | Drilling |
| D. | Enlarging |
| Answer» D. Enlarging | |
| 732. |
A jet engine turbine blade is normally manufactured by____________________? |
| A. | Forging |
| B. | Shell moulding |
| C. | Investment casting |
| D. | Pressure die casting |
| Answer» D. Pressure die casting | |
| 733. |
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 | |
| 734. |
A high pressure boiler generates steam at a pressure greater than _____________________ kg/cm2 ? |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 80 |
| Answer» E. | |
| 735. |
A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________? |
| A. | Aqueous tension |
| B. | Saturated humidity |
| C. | Vapor pressure |
| D. | Absolute humidity |
| Answer» B. Saturated humidity | |
| 736. |
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness ______________ metre? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.25 |
| D. | 0.5 |
| Answer» C. 0.25 | |
| 737. |
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 | |
| 738. |
A fluid is termed as the Newtonian fluid, when the shear stress is _________________ the velocity gradient ? |
| A. | Independent of |
| B. | Inversely proportional to |
| C. | Directly proportional to |
| D. | None of these |
| Answer» D. None of these | |
| 739. |
A dummy activity is used in PERT network to describe the_____________________? |
| A. | Precedence relationship |
| B. | Resource idleness |
| C. | Resource restriction |
| D. | Necessary time delay |
| Answer» B. Resource idleness | |
| 740. |
A dense structure of grinding wheel is not used for the_____________________? |
| A. | Ductile material |
| B. | Hard materials |
| C. | Brittle materials |
| D. | Finishing cuts |
| Answer» B. Hard materials | |
| 741. |
A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson’s ratio of the rod is___________________? |
| A. | 0 |
| B. | 0.33 |
| C. | 0.44 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 742. |
A compact estimate about the amount of materials handling between various work stations is obtained from the_____________________? |
| A. | Gantt chart |
| B. | Bin chart |
| C. | String diagram |
| D. | Travel chart |
| Answer» E. | |
| 743. |
A common disinfectant used in village wells for disinfection of water is __________________? |
| A. | Free chlorine |
| B. | Bromine |
| C. | Iodine |
| D. | Potassium permanganate |
| Answer» E. | |
| 744. |
A 2 kg object weighs 1.8 kgf on a spring balance. The value of ‘g’ at that location in m/sec2 is___________________? |
| A. | 8.82 |
| B. | 9.81 |
| C. | 10.88 |
| D. | 0.95 |
| Answer» B. 9.81 | |
| 745. |
For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = - 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be |
| A. | 30000 J |
| B. | 60000 J |
| C. | 90000 J |
| D. | 240000 J |
| Answer» D. 240000 J | |
| 746. |
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. | |
| 747. |
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively. |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 5 | |
| 748. |
A thin, flat & square plate measuring 2 m x 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2 . The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m2 °C. |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 749. |
Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) |
| A. | T |
| B. | 1/p |
| C. | y |
| D. | 1/ρ |
| Answer» C. y | |
| 750. |
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. | |