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MCQOPTIONS
This section includes 2095 Mcqs, each offering curated multiple-choice questions to sharpen your Php knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
If one deals with only one filler, then ash content is all that is required to follow the filler. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 752. |
Bacterial leaching is possible with low concentrations and requires little energy inputs. |
| A. | True |
| B. | False |
| Answer» C. | |
| 753. |
Which type of ore is the major source of nickel? |
| A. | Oxide |
| B. | Sulfide |
| C. | Carbonate |
| D. | Ferrous |
| Answer» C. Carbonate | |
| 754. |
In the studies of Joffe and Sperll, it was observed that ________ is efficient for solubilizing Ni but the presence of ______ had adverse effect on leaching. |
| A. | T. ferrooxidans; cobalt |
| B. | T.trioxidanes; molybdenum |
| C. | T. ferrooxidans; molybdenum |
| D. | T. trioxidanes; cobalt |
| Answer» D. T. trioxidanes; cobalt | |
| 755. |
Which leaching agent is used for the slow decomposition of refractory gold ores? |
| A. | Nickel |
| B. | Sulphur |
| C. | Cyanide |
| D. | Molybdenum |
| Answer» D. Molybdenum | |
| 756. |
Acidithiobacillus sp. is used to extract what kind of metal ore? |
| A. | Oxide |
| B. | Carbonate |
| C. | Silicate |
| D. | Sulphate |
| Answer» E. | |
| 757. |
Which of the following mechanism is used for bioleaching of uranium? |
| A. | Direct Leaching Mechanism |
| B. | Indirect Leaching Mechanism |
| C. | Acid Leaching Mechanism |
| D. | Alkali Leaching Mechanism |
| Answer» C. Acid Leaching Mechanism | |
| 758. |
Some heterotrophic bacteria are present in the copper dumps which indirectly affect metal ________ by affecting the growth and activity of metal solubilizing _______ |
| A. | solubilization; bacteria |
| B. | solubilization; fungi |
| C. | activity; bacteria |
| D. | activity; fungi |
| Answer» B. solubilization; fungi | |
| 759. |
The maximum temperature that may reach in the interior dump of copper bioleaching is ______ |
| A. | 120°C |
| B. | 100°C |
| C. | 90°C |
| D. | 70°C |
| Answer» D. 70°C | |
| 760. |
What percentage of total world copper production do bioleach of copper alone contributes? |
| A. | 10% |
| B. | 17% |
| C. | 25% |
| D. | 33.3% |
| Answer» D. 33.3% | |
| 761. |
Which commercial bioleaching processes among the following involves piling up of uncrushed waste rock? |
| A. | In Situ |
| B. | Dump Leaching |
| C. | Heap Leaching |
| D. | Vat Leaching |
| Answer» C. Heap Leaching | |
| 762. |
Which of the following is not present in commercial preparation from Trichoderma reesei? |
| A. | cellulase |
| B. | glucan 1,4-b-glucosidase |
| C. | invertase |
| D. | cellulose 1,4-b-cellobiosidase |
| Answer» D. cellulose 1,4-b-cellobiosidase | |
| 763. |
Cellulase is obtained from ___________ |
| A. | Leuconostoc mesenteroides |
| B. | Saccharomyces cerevisiae |
| C. | Trichoderma reesei |
| D. | Bacillus acidopullulyticus |
| Answer» D. Bacillus acidopullulyticus | |
| 764. |
In tropical rain forests, dead trees take several years to decay. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 765. |
Fungal dextranases is produced from __________ species. |
| A. | Yeast |
| B. | Penicillium |
| C. | Bacillus |
| D. | Aspergillus species |
| Answer» C. Bacillus | |
| 766. |
Raffinose is hydrolyzed to galactose and sucrose by __________ enzyme. |
| A. | Raffinase |
| B. | Dextranase |
| C. | Invertase |
| D. | 1,4-α-glucosidase |
| Answer» B. Dextranase | |
| 767. |
Dextran may be produced by the action of __________ enzyme. |
| A. | Invertase |
| B. | Rennet |
| C. | Dextransucrase |
| D. | β – amylase |
| Answer» D. β – amylase | |
| 768. |
Invertase finds its use in the production of confectionery with liquid or soft centers. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 769. |
Sucrose may be degraded by ____________ to produce glucose and fructose. |
| A. | Papain |
| B. | β – amylase |
| C. | 1,4-α-glucosidase |
| D. | Invertase |
| Answer» E. | |
| 770. |
As the fluidization velocity increases, large bubbles break up into several smaller ones and when this break-up process overcomes the coalescence of the bubbles, oscillations of the pressure drop become smaller. This is the moment when _________ regime occurs. |
| A. | Laminar |
| B. | Mixing |
| C. | Transition |
| D. | Turbulent |
| Answer» E. | |
| 771. |
The fluidized state, occurring between the filtration of the fixed bed and the pneumatic conveying regime contains three different regimes. Which one of the following is not correct? |
| A. | Stationary bubbling fluidized bed |
| B. | Dense Flow fluidised bed |
| C. | Fast fluidization |
| D. | Turbulent fluidized bed |
| Answer» C. Fast fluidization | |
| 772. |
The pressure drop in bubbling fluidised bed ___________ with time for a given flow velocity. |
| A. | Increases |
| B. | Decreases |
| C. | Oscillates |
| D. | Remains same |
| Answer» D. Remains same | |
| 773. |
The gas phase fluidised bed is commonly known as ______________ because of its top surface fluidisation. |
| A. | Bubbling fluidized bed |
| B. | Bursting fluidised bed |
| C. | Partially fluidised bed |
| D. | Chaotic fluidised bed |
| Answer» B. Bursting fluidised bed | |
| 774. |
The curve in the Zenz – diagram represents ________ as the pressure drop per unit of length as a function of the air flow (or air velocity). |
| A. | Pneumatic conveying |
| B. | Fluidised Reactor |
| C. | Packed bed |
| D. | Shell and Tube heat exchanger |
| Answer» B. Fluidised Reactor | |
| 775. |
When the bed is fluidized with liquids, it is known as ___________ fluidization, and with gas too it is known as ___________ fluidization. |
| A. | Homogeneous, Homogeneous |
| B. | Heterogeneous, Homogeneous |
| C. | Homogeneous, Heterogeneous |
| D. | Heterogeneous, Heterogeneous |
| Answer» D. Heterogeneous, Heterogeneous | |
| 776. |
After fluidisation, the pressure drop in the fluid phase across the bed is _______ to the bed weight over unit surface of the bed cross section. |
| A. | Equal |
| B. | Slightly more |
| C. | Much greater |
| D. | Less |
| Answer» C. Much greater | |
| 777. |
What is the name of the following bed? |
| A. | Bubbled Bed |
| B. | Spouted Bed |
| C. | Packed bed flow |
| D. | Slip-stick flow |
| Answer» C. Packed bed flow | |
| 778. |
Which one of the following description best suits the definition of slip-stick flow bed? |
| A. | Dilute phase flow |
| B. | Laminar flow |
| C. | Sticky flow |
| D. | Dense phase flow |
| Answer» E. | |
| 779. |
Zenz diagram is drawn with the following axis, which one is correct? |
| A. | Pressure drop vs Gas velocity |
| B. | Pressure drop vs superficial velocity |
| C. | Superficial velocity vs pressure drop |
| D. | Pressure drop vs Terminal velocity |
| Answer» C. Superficial velocity vs pressure drop | |
| 780. |
In Fischer–Tropsch process, the particles of the bed are _______ |
| A. | Catalysts |
| B. | Coal |
| C. | Silica |
| D. | Stones |
| Answer» B. Coal | |
| 781. |
A eutectoid steel is slowly cooled from a temperature of 750°C to a temperature just below 727°C. Calculate the percentage of ferrite and cementite. |
| A. | 88.3% and 11.7% |
| B. | 70% and 30 % |
| C. | 85.4% and 14.6% |
| D. | 20% and 20% |
| Answer» B. 70% and 30 % | |
| 782. |
From the following figure if Diffusion rates below Ms is so low that γ → M transformation is a diffusionless process then what is change in crystal structurea) FCC → BCTb) FCC → BCCc) BCC → BCTd) BCT → BCC 9.Finer size pearlite is called _______ |
| A. | FCC → BCTb) FCC → BCCc) BCC → BCTd) BCT → BCC 9.Finer size pearlite is called _______a) Troostite |
| B. | FCC → BCCc) BCC → BCTd) BCT → BCC 9.Finer size pearlite is called _______a) Troostiteb) Ledeburite |
| C. | BCC → BCTd) BCT → BCC 9.Finer size pearlite is called _______a) Troostiteb) Ledeburitec) Ferrite |
| D. | BCT → BCC 9.Finer size pearlite is called _______a) Troostiteb) Ledeburitec) Ferrited) SorbiteView Answer |
| Answer» B. FCC → BCCc) BCC → BCTd) BCT → BCC 9.Finer size pearlite is called _______a) Troostiteb) Ledeburite | |
| 783. |
Compositions right and left of 0.8% C of Pearlite are called __________a) Ledeburiteb) Ferritec) Hyper and Hypoeutectoid steeld) Cast iron 7.Compositions above 2.1% C is called as _______ |
| A. | Ledeburiteb) Ferritec) Hyper and Hypoeutectoid steeld) Cast iron 7.Compositions above 2.1% C is called as _______a) Ledeburite |
| B. | Ferritec) Hyper and Hypoeutectoid steeld) Cast iron 7.Compositions above 2.1% C is called as _______a) Ledeburiteb) Ferrite |
| C. | Hyper and Hypoeutectoid steeld) Cast iron 7.Compositions above 2.1% C is called as _______a) Ledeburiteb) Ferritec) Hyper and Hypoeutectoid steel |
| D. | Cast iron 7.Compositions above 2.1% C is called as _______a) Ledeburiteb) Ferritec) Hyper and Hypoeutectoid steeld) Cast ironView Answer |
| Answer» D. Cast iron 7.Compositions above 2.1% C is called as _______a) Ledeburiteb) Ferritec) Hyper and Hypoeutectoid steeld) Cast ironView Answer | |
| 784. |
The eutectoid mixture of ferrite (α) and cementite (Fe3C) is called __________ |
| A. | Ledeburite |
| B. | Pearlite |
| C. | Hyper and hypo eutectoid steel |
| D. | Cast iron |
| Answer» C. Hyper and hypo eutectoid steel | |
| 785. |
The eutectic mixture of austenite (γ) and cementite (Fe3C) is called __________ |
| A. | Ledeburite |
| B. | Pearlite |
| C. | Hyper and hypo eutectoid steel |
| D. | Cast iron |
| Answer» B. Pearlite | |
| 786. |
What is Eutectoid reaction at 727°C? |
| A. | L (0.53% C) + δ(0.09% C) → γ(0.17% C) |
| B. | L (4.3% C) → γ(2.1 % C) + Fe3C (6.67% C) |
| C. | γ (0.8 % C) → α (0.025% C) + Fe3C (6.67% C) |
| D. | L (0.53% C) + δ(0.09% C) → γ (0.8 % C) |
| Answer» D. L (0.53% C) + δ(0.09% C) → γ (0.8 % C) | |
| 787. |
What is the Eutectic reaction at 1146°C? |
| A. | L (0.53% C) + δ(0.09% C) → γ(0.17% C) |
| B. | L (4.3% C) → γ(2.1 % C) + Fe3C (6.67% C) |
| C. | γ (0.8 % C) → α (0.025% C) + Fe3C (6.67% C) |
| D. | L (0.53% C) + δ(0.09% C) → γ (0.8 % C) |
| Answer» C. γ (0.8 % C) → α (0.025% C) + Fe3C (6.67% C) | |
| 788. |
What is the Peritectic reaction at 1495°C? |
| A. | L (0.53% C) + δ(0.09% C) → γ(0.17% C) |
| B. | L (4.3% C) → γ(2.1 % C) + Fe3C (6.67% C) |
| C. | γ (0.8 % C) → α (0.025% C) + Fe3C (6.67% C) |
| D. | L (0.53% C) + δ(0.09% C) → γ (0.8 % C) |
| Answer» B. L (4.3% C) → γ(2.1 % C) + Fe3C (6.67% C) | |
| 789. |
In ________ riveting, the rivets in the adjacent rows are staggered and are placed in between those of the previous row. |
| A. | diamond |
| B. | chain |
| C. | square |
| D. | zigzag |
| Answer» E. | |
| 790. |
If the rivets are used along a number of rows such that the rivets in the adjacent rows are placed directly opposite to each other, it is known as _________ |
| A. | diamond |
| B. | chain |
| C. | square |
| D. | zigzag |
| Answer» C. square | |
| 791. |
If the number of rivets in each adjacent row goes on decreasing in subsequent rows towards edge, it is called _________ riveting. |
| A. | diamond |
| B. | chain |
| C. | square |
| D. | zigzag |
| Answer» B. chain | |
| 792. |
According to arrangements of plates, which of the following is not a type of riveted joints? |
| A. | single cover plate butt joint |
| B. | double cover plate butt joint |
| C. | lap joint |
| D. | zigzag joint |
| Answer» E. | |
| 793. |
SSF occurs in the presence of the liquid medium. |
| A. | True |
| B. | False |
| Answer» C. | |
| 794. |
The concentration of products is low in SSF. |
| A. | True |
| B. | False |
| Answer» C. | |
| 795. |
Which of the following bioreactor mix intermittently without forced aeration? |
| A. | Packed-bed bioreactors |
| B. | Rotating drum bioreactors |
| C. | Spouted-bed bioreactors |
| D. | Fluidized-bed bioreactors |
| Answer» C. Spouted-bed bioreactors | |
| 796. |
Which of the following physicochemical factor does not affect SSF? |
| A. | Pressure |
| B. | Temperature |
| C. | pH |
| D. | Moisture content |
| Answer» B. Temperature | |
| 797. |
Which of the following requires a substrate as support? |
| A. | Submerged fermentation |
| B. | Surface fermentation |
| C. | Solid state fermentation |
| D. | Batch fermentation |
| Answer» D. Batch fermentation | |
| 798. |
Which of the following bioreactor is used in group-1 SSF? |
| A. | Rotating drum |
| B. | Stirred-bed |
| C. | Packed bed |
| D. | Tray |
| Answer» E. | |
| 799. |
Which of the following is not true of solid state fermentation (SSF)? |
| A. | Easy downstream process |
| B. | Small-size bioreactors are used |
| C. | Greater chances of contamination |
| D. | Less consumption of energy |
| Answer» D. Less consumption of energy | |
| 800. |
Which of the following process occurs in the absence of free liquid? |
| A. | Submerged fermentation |
| B. | Batch fermentation |
| C. | Solid state fermentation |
| D. | Continuous fermentation |
| Answer» D. Continuous fermentation | |