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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.
| 751. |
For infinite parallel planes having emis-sivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by |
| A. | (ε1 + ε2)/ε1.ε2 |
| B. | ε1.ε2/(ε1 + ε2 - ε1.ε2) |
| C. | ε1.ε2 |
| D. | ε1 + ε2 |
| Answer» C. ε1.ε2 | |
| 752. |
Which of the following material handling equipments is not suitable for moving materials in varying paths? |
| A. | and trolley |
| B. | elt conveyor |
| C. | rane |
| D. | ruck |
| Answer» C. rane | |
| 753. |
Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore? |
| A. | ilica |
| B. | ime |
| C. | lumina |
| D. | luorite |
| Answer» D. luorite | |
| 754. |
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. | 0000 J |
| B. | 0000 J |
| C. | 0000 J |
| D. | 40000 J |
| Answer» D. 40000 J | |
| 755. |
In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet? |
| A. | irconia |
| B. | lumina |
| C. | akelite |
| D. | ungsten carbide |
| Answer» E. | |
| 756. |
Which of the following is not the function of a volute casing provided in a centrifugal pump? |
| A. | o reduce the head loss in discharge |
| B. | o increase the pump efficiency |
| C. | o collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity |
| D. | o increase the pump discharge rate |
| Answer» E. | |
| 757. |
Which is the most suitable joint for the pipes, with are laid submerged under water, where the bottom of the river bed is uneven? |
| A. | ollar joint |
| B. | lexible joint |
| C. | langed joint |
| D. | xpansion joint |
| Answer» C. langed joint | |
| 758. |
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly? |
| A. | obalt: It contributes to rerl hardness by hardening ferrite |
| B. | olybdenum: It forms abrasion resisting particles |
| C. | hosphorous: It improves machinability in free cutting steels |
| D. | ilicon: It reduces oxidation resistance |
| Answer» B. olybdenum: It forms abrasion resisting particles | |
| 759. |
Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils? |
| A. | laiden test |
| B. | eichart-Meissl value test |
| C. | enter value test |
| D. | odine value test |
| Answer» B. eichart-Meissl value test | |
| 760. |
Welded joint is superior to revetted joint in respect of ease of fabrication, weight and strength. Which of the following joints is the most suitable for pipes carrying fluids under high pressure and temperature? |
| A. | langed joint |
| B. | xpansion joint |
| C. | ell and spigot joint |
| D. | one of these |
| Answer» C. ell and spigot joint | |
| 761. |
Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner? |
| A. | utput & fineness |
| B. | elocity |
| C. | oth A & B |
| D. | one of these |
| Answer» D. one of these | |
| 762. |
Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10⁻² atm, the partial pressure of B is 10⁻³ atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is |
| A. | 0 atmv |
| B. | 0⁵ atm⁻¹ |
| C. | 0 (dimensionless) |
| D. | 0⁵ (dimensionless) |
| Answer» C. 0 (dimensionless) | |
| 763. |
In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material? |
| A. | in |
| B. | ead |
| C. | inc |
| D. | lass |
| Answer» E. | |
| 764. |
The basic constituent of vegetable oils is |
| A. | triglyceride |
| B. | fatty acids |
| C. | fatty alcohol |
| D. | mono esters |
| Answer» C. fatty alcohol | |
| 765. |
Air-petrol ratio for maximum power generation in spark ignition engine is about |
| A. | 6:1 |
| B. | 12 : 1 |
| C. | 18 : 1 |
| D. | 24 : 1 |
| Answer» C. 18 : 1 | |
| 766. |
Which of the following alloying elements is present in maximum percentage in high speed steel. |
| A. | Molybdenum |
| B. | Chromium |
| C. | Tungsten |
| D. | Vanadium |
| Answer» B. Chromium | |
| 767. |
With increase in temperature, the electrical conductivity of semiconductors |
| A. | increases. |
| B. | decreases. |
| C. | remain constant. |
| D. | either (a) or (b), depends on the type of semi-conductor. |
| Answer» B. decreases. | |
| 768. |
Theoretical volume of oxygen required for complete combustion of 1Nm³ of acetylene, in oxy-acetylene welding is __________ Nm³ . |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 2.5 |
| Answer» E. | |
| 769. |
Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10⁻² atm, the partial pressure of B is 10⁻³ atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is |
| A. | 10 atm⁻¹ |
| B. | 10⁵ atm⁻¹ |
| C. | 10 (dimensionless) |
| D. | 10⁵ (dimensionless) |
| Answer» C. 10 (dimensionless) | |
| 770. |
About __________ ton of coke is required in a cupola to produce one ton of casting. |
| A. | 0.03 |
| B. | 0.3 |
| C. | 0.8 |
| D. | 1.5 |
| Answer» C. 0.8 | |
| 771. |
The value of y = Cᵨ/Cᵥ. at < 500°C for air & most common gases can be safely assumed to be |
| A. | 0.8 |
| B. | 1 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 772. |
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. | |
| 773. |
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. | |
| 774. |
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 | |
| 775. |
Addition of __________ in steel can help in increasing the depth of hardness. |
| A. | nickel |
| B. | chromium |
| C. | vanadium |
| D. | tungsten |
| Answer» D. tungsten | |
| 776. |
Silicon percentage in acid resistant cast iron is about |
| A. | 4 |
| B. | 8 |
| C. | 14 |
| D. | 20 |
| Answer» B. 8 | |
| 777. |
Titanium is produced by __________ of TiCl₄. |
| A. | electrolytic reduction |
| B. | calcium reduction |
| C. | magnesium reduction |
| D. | thermal dissociation |
| Answer» D. thermal dissociation | |
| 778. |
M₁₀ index of coke indicates its |
| A. | compressive strength. |
| B. | hardness. |
| C. | abrasion resistance. |
| D. | impact strength. |
| Answer» D. impact strength. | |
| 779. |
Satellites burn off during re-entry to earth's atmosphere, because of the |
| A. | combustion with air. |
| B. | gravitational pull by earth. |
| C. | friction with earth's atmosphere. |
| D. | loss in weight of the satellite. |
| Answer» D. loss in weight of the satellite. | |
| 780. |
Fire in fuel gas pipelines is extinguished most effectively by |
| A. | spraying water. |
| B. | blanketting the area with nitrogen atmosphere. |
| C. | fire fighting foam. |
| D. | none of these. |
| Answer» C. fire fighting foam. | |
| 781. |
Atomic __________ of an element is a whole number. |
| A. | weight |
| B. | number |
| C. | volume |
| D. | radius |
| Answer» C. volume | |
| 782. |
Brinell Hardness Number (BHN) for talc is approximately in the range of |
| A. | 1-5 |
| B. | 20-30 |
| C. | 100-150 |
| D. | 200-250 |
| Answer» C. 100-150 | |
| 783. |
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K⁻¹mole⁻¹) |
| A. | 2300 J |
| B. | 4600 J |
| C. | 230 J |
| D. | 2.3 x 10⁶ J |
| Answer» B. 4600 J | |
| 784. |
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 | |
| 785. |
A reduction process is accompanied with increase in the |
| A. | number of electrons. |
| B. | oxidation number. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» B. oxidation number. | |
| 786. |
Water flow in the river during flood can be categorised as the __________ flow. |
| A. | unsteady uniform |
| B. | unsteady non-uniform |
| C. | steady uniform |
| D. | steady non-uniform |
| Answer» C. steady uniform | |
| 787. |
Reduction in the grain size reduces the __________ of the material. |
| A. | fatigue resistance |
| B. | tensile strength |
| C. | creep resistance |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 788. |
Silicon percentage in silicon steel used for electrical equipments is about |
| A. | 1 |
| B. | 4.0 |
| C. | 8 |
| D. | 14 |
| Answer» C. 8 | |
| 789. |
Liquor poisoning generally occurs due to the presence of __________ in it. |
| A. | ethyl alcohol |
| B. | impurities |
| C. | methyl alcohol |
| D. | carbonic acid |
| Answer» D. carbonic acid | |
| 790. |
The specific gravity of coal depends mainly on its __________ content. |
| A. | carbon |
| B. | volatile matter |
| C. | ash |
| D. | moisture |
| Answer» E. | |
| 791. |
What happens, when SO₂ is passed through a solution of H₂S in water ? |
| A. | Precipitation of sulphur takes place. |
| B. | H₂SO₃ is formed. |
| C. | Oleum is formed. |
| D. | None of these. |
| Answer» B. H₂SO₃ is formed. | |
| 792. |
The Al₂O₃ content of cryolite in Hall-Heroult's cell is maintained between __________ percent. |
| A. | 2-5 |
| B. | 18-20 |
| C. | 12-15 |
| D. | 6-12 |
| Answer» B. 18-20 | |
| 793. |
Unbreakable crockeries are made from __________ polymers. |
| A. | polystyrene |
| B. | melamine |
| C. | polystyrene |
| D. | polyurathane |
| Answer» E. | |
| 794. |
For an ideal gas, Cᵨ - Cᵥ is |
| A. | R |
| B. | -R |
| C. | 0 |
| D. | (3/2) R |
| Answer» B. -R | |
| 795. |
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 | |
| 796. |
The increase in hardness of metal due to its cold working is termed as the __________ hardening. |
| A. | work |
| B. | age |
| C. | induction |
| D. | flame |
| Answer» D. flame | |
| 797. |
Which of the following heat treatment processes is used for softening the hardened material ? |
| A. | Normalising |
| B. | Tempering |
| C. | Annealing |
| D. | None of these |
| Answer» C. Annealing | |
| 798. |
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 | |
| 799. |
The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x^0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) |
| A. | x^1.5 |
| B. | x^0.8 |
| C. | x^-1.5 |
| D. | x^-0.8 |
| Answer» C. x^-1.5 | |
| 800. |
The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm² . |
| A. | 273.15 |
| B. | 225.65 |
| C. | 100.03 |
| D. | 373.15 |
| Answer» C. 100.03 | |