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.
| 701. |
Polymethyl methacrylate, which is an acrylic resin, is also called |
| A. | thiokol |
| B. | plexiglass or lucite |
| C. | dacron |
| D. | teflon |
| Answer» C. dacron | |
| 702. |
Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ C. |
| A. | -20 |
| B. | 50 |
| C. | 250 |
| D. | 500 |
| Answer» C. 250 | |
| 703. |
Addition of stabiliser during PVC manufacture is done to |
| A. | improve its impact strength. |
| B. | improve its elasticity. |
| C. | reduce the melt viscosity & glass transition temperature. |
| D. | prevent its thermal degradation. |
| Answer» E. | |
| 704. |
Addition polymerisation is not involved in the manufacture of |
| A. | low density polythene. |
| B. | poly vinyl chloride. |
| C. | polystyrene. |
| D. | polyhexamethylene adipamide. |
| Answer» E. | |
| 705. |
Which of the following is not a polyolefin ? |
| A. | Polystyrene |
| B. | Polypropylene |
| C. | Neoprene |
| D. | None of these |
| Answer» D. None of these | |
| 706. |
Most of the plastics are safe to be used upto a maximum temperature of __________ C. |
| A. | 100 |
| B. | 150 |
| C. | 350 |
| D. | 450 |
| Answer» C. 350 | |
| 707. |
Plastic tubes & pipes are generally made by __________ moulding. |
| A. | injection |
| B. | transfer |
| C. | extrusion |
| D. | compression |
| Answer» D. compression | |
| 708. |
__________ is a natural fibre. |
| A. | Cellulose |
| B. | Dacron |
| C. | Nylon-6 |
| D. | none of these |
| Answer» B. Dacron | |
| 709. |
Perspex can be used as a substitute of glass. Its monomer is |
| A. | methyl methacrylate |
| B. | DMT |
| C. | butadiene |
| D. | tetrafluroethylene |
| Answer» B. DMT | |
| 710. |
Rayon is superior to cotton in making gauge for wound treatment, because rayon |
| A. | is a synthetic polymer. |
| B. | does not stick to the wound unlike cotton. |
| C. | can absorb over 90% of its own weight of water. |
| D. | both (b) and (c). |
| Answer» C. can absorb over 90% of its own weight of water. | |
| 711. |
Polymerisation of poly functional monomers produces polymers having |
| A. | good machanical strength |
| B. | low viscosity |
| C. | low melting point |
| D. | none of these |
| Answer» B. low viscosity | |
| 712. |
Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. |
| A. | nylon |
| B. | polyacrylonitrile |
| C. | polypropylene |
| D. | polyester |
| Answer» C. polypropylene | |
| 713. |
Polycaprolactum is |
| A. | nylon-6 |
| B. | nylon-66 |
| C. | dacron |
| D. | rayon |
| Answer» B. nylon-66 | |
| 714. |
Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin. |
| A. | resorcinol |
| B. | phenol |
| C. | para-cresol |
| D. | melamine |
| Answer» E. | |
| 715. |
Flexible foam (for mattresses) are usually made of |
| A. | PVC |
| B. | silicone rubber |
| C. | polyurethanes |
| D. | polyamides |
| Answer» D. polyamides | |
| 716. |
__________ fibres are made of polyamides. |
| A. | Dacron |
| B. | Nylon |
| C. | Rayon |
| D. | Orion |
| Answer» C. Rayon | |
| 717. |
Polymethyl methacrylate (PMMA) which is also known as perspex and is produced by bulk polymerisation of methyl methacrylate is not a __________ polymer. |
| A. | thermoplastic |
| B. | thermosetting |
| C. | linear |
| D. | glass like transparent |
| Answer» C. linear | |
| 718. |
Which of the following is not an elastomer ? |
| A. | Polyisoprene |
| B. | Neoprene |
| C. | Nitrile-butadiene |
| D. | None of these |
| Answer» E. | |
| 719. |
Branched chain polymers compared to linear polymers have higher |
| A. | density. |
| B. | tensile strength. |
| C. | melting point. |
| D. | degree of irregularity in atomic packing. |
| Answer» E. | |
| 720. |
Styrene butadiene rubber is commercially manufactured by |
| A. | bulk polymerisation |
| B. | suspension polymerisation |
| C. | solution polymerisation |
| D. | emulsion polymerisation |
| Answer» E. | |
| 721. |
Bakelite (phenol-formaldehyde) resin can not be used as |
| A. | decorative paint. |
| B. | decorative laminates. |
| C. | electrical insulation. |
| D. | glass reinforced plastics. |
| Answer» B. decorative laminates. | |
| 722. |
Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten |
| A. | saturated polyester |
| B. | polyurathane |
| C. | polystyrene |
| D. | either (b) or (c) |
| Answer» E. | |
| 723. |
Cross linked polymers formed from bi-and trifuctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties. |
| A. | thermoplastic |
| B. | thermosetting |
| C. | elastometric |
| D. | brittleness |
| Answer» D. brittleness | |
| 724. |
Thermosetting resins/polymers as compared to thermoplastic ones are |
| A. | soluble in all organic solvents. |
| B. | more brittle. |
| C. | formed by addition polymerisation only. |
| D. | easily reshaped & reused. |
| Answer» C. formed by addition polymerisation only. | |
| 725. |
The generic chemical name for the class of polymers which are commerically known as nylons is |
| A. | polyolefins |
| B. | polyamide |
| C. | polyacrylate |
| D. | polyurathane |
| Answer» C. polyacrylate | |
| 726. |
Polycondensation reaction of polymerisation |
| A. | does not produce linear polymers. |
| B. | produces only thermoplastic material. |
| C. | produces epoxy polymers. |
| D. | does not need any catalyst. |
| Answer» D. does not need any catalyst. | |
| 727. |
Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but |
| A. | polyacrylonitrile |
| B. | polyamide |
| C. | saturated polyester |
| D. | alkyd resin |
| Answer» B. polyamide | |
| 728. |
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their |
| A. | molecular sizes. |
| B. | magnitude of intermolecular forces. |
| C. | resistance to heat. |
| D. | polymerisation mechanism. |
| Answer» C. resistance to heat. | |
| 729. |
Which of the following is a polymer of hexamethylene diamine and adipic acid ? |
| A. | Nylon-6 |
| B. | Nylon-66 |
| C. | Nylon-6, 10 |
| D. | Epoxy resin |
| Answer» C. Nylon-6, 10 | |
| 730. |
Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is |
| A. | nylon-66 |
| B. | teflon |
| C. | polyester |
| D. | bakelite |
| Answer» C. polyester | |
| 731. |
Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ? |
| A. | Phosphorous |
| B. | Carbon black |
| C. | Pine oil |
| D. | Rosin |
| Answer» C. Pine oil | |
| 732. |
__________ is an addition polymer |
| A. | Nylon |
| B. | Bakelite |
| C. | Polythene |
| D. | none of these |
| Answer» D. none of these | |
| 733. |
Branched chair polymers as compared to linear polymers have |
| A. | higher melting point. |
| B. | higher tensile strength. |
| C. | lower density. |
| D. | none of these. |
| Answer» D. none of these. | |
| 734. |
Ion exchange resins are made of |
| A. | lucite |
| B. | sulphonated bakelite |
| C. | polystyrene |
| D. | teflon |
| Answer» C. polystyrene | |
| 735. |
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher |
| A. | densities |
| B. | melting point |
| C. | tensile strength |
| D. | hardness, rigidity & brittleness |
| Answer» E. | |
| 736. |
Terylene is a/an |
| A. | addition polymer |
| B. | poly amide |
| C. | homopolymer |
| D. | none of these |
| Answer» E. | |
| 737. |
Rayon is a __________ fibre. |
| A. | cellulosic |
| B. | polyamide |
| C. | polyester |
| D. | natural |
| Answer» B. polyamide | |
| 738. |
Commercial production of polypropylene employs __________ polymerisation. |
| A. | emulsion |
| B. | suspension |
| C. | solution |
| D. | bulk |
| Answer» D. bulk | |
| 739. |
In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is |
| A. | terylene |
| B. | polybutadiene |
| C. | PVC |
| D. | polypropylene |
| Answer» B. polybutadiene | |
| 740. |
The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is |
| A. | polyvinyl alcohol |
| B. | polyvinyl acetale |
| C. | polyvinyl butyral |
| D. | PVC |
| Answer» D. PVC | |
| 741. |
The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials. |
| A. | non-crystalline solid |
| B. | crystalline |
| C. | rubberry |
| D. | non-crystalline organic polymeric. |
| Answer» E. | |
| 742. |
Coke oven regenerators are made of __________ bricks. |
| A. | fire clay |
| B. | silica |
| C. | low thermal conductivity |
| D. | high electrical conductivity |
| Answer» B. silica | |
| 743. |
The method of Lobo and Evans is concerned with the calculation of the |
| A. | heat absorption in radiant section of a furnace. |
| B. | heat transfer by forced convection in a reboiler. |
| C. | heat transfer in vacuum condensers. |
| D. | mass transfer co-efficient. |
| Answer» B. heat transfer by forced convection in a reboiler. | |
| 744. |
In furnaces operating at very high temperature (say) 1250 C, e.g. soaking pit), the maximum heat transfer takes place by |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | can not be predicted. |
| Answer» D. can not be predicted. | |
| 745. |
Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a |
| A. | furnace employing neutral atmosphere. |
| B. | carbon resistance furnace. |
| C. | reducing atmosphere. |
| D. | furnace employing negative pressure. |
| Answer» C. reducing atmosphere. | |
| 746. |
Regenerators compared to the recuperators for the same duty |
| A. | occupy more space |
| B. | are less costly |
| C. | are of smaller size |
| D. | all (a), (b) and (c) |
| Answer» B. are less costly | |
| 747. |
Regenerators are used for waste heat recovery in |
| A. | by-product coke ovens |
| B. | beehive coke oven |
| C. | blast furnace stoves |
| D. | soaking pits |
| Answer» B. beehive coke oven | |
| 748. |
Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an |
| A. | blast furnace. |
| B. | steam boiler. |
| C. | salt bath furnace. |
| D. | annealing furnace. |
| Answer» D. annealing furnace. | |
| 749. |
Which of the following furnaces will have maximum thermal efficiency ? |
| A. | Soaking pits |
| B. | Walking beam reheating furnace |
| C. | Boiler furnace |
| D. | Rotary kilns |
| Answer» D. Rotary kilns | |
| 750. |
Pot furnace which is either regenerative or recupterative, is used in the manufacture of |
| A. | glass |
| B. | stainless steel |
| C. | potteries |
| D. | refractory bricks. |
| Answer» B. stainless steel | |