The plastic material commonly used for making gear wheels is – (1) Polyesters (2) Nylons (3) Bakelit (4) Polystyrene

The plastic material commonly used for making gear wheels is – (1) Polyesters (2) Nylons (3) Bakelit (4) Polystyrene
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(2) Nylons Explanation: Popular materials for plastic gears are acetal resins such as DELRIN, Duracon M90; nylon resins such as ZYTEL, NYLATRON, MC901 and acetal copolymers such as CELCON. The physical and mechanical properties of these materials vary with regard to strength, rigidity, dimensional stability, lubrication requirements, moisture absorption, etc.
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The plastic material commonly used for making gear wheels is (1) Polyesters (2) Nylons (3) Bakelit (4) Polystyrene

Description : The plastic material commonly used for making gear wheels is (1) Polyesters (2) Nylons (3) Bakelit (4) Polystyrene

Last Answer : Nylons

Adipic acid is an intermediate in the manufacture of (A) Perspex (B) Nylon-66 (C) Polystyrene (D) Bakelit

Description : Adipic acid is an intermediate in the manufacture of (A) Perspex (B) Nylon-66 (C) Polystyrene (D) Bakelit

Last Answer : (B) Nylon-66

In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of (A) Cross linked polystyrene (B) Phenol formaldehyde resins (C) Polyesters (D) Polyamides

Description : In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of (A) Cross linked polystyrene (B) Phenol formaldehyde resins (C) Polyesters (D) Polyamides

Last Answer : (A) Cross linked polystyrene

Naphthalene is used for making (A) Insecticides (e.g. moth balls) (B) Unsaturated polyesters (C) Drug intermediates e.g. β-naphthol (D) All (A), (B) and (C)

Description : Naphthalene is used for making (A) Insecticides (e.g. moth balls) (B) Unsaturated polyesters (C) Drug intermediates e.g. β-naphthol (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Which one among the following polymers is used for making bullet-proof material? (1) Polyvinyl chloride (2) Polystyrene (3) Polyethylene (4) Polyamide

Description : Which one among the following polymers is used for making bullet-proof material? (1) Polyvinyl chloride (2) Polystyrene (3) Polyethylene (4) Polyamide

Last Answer : (3) Polyethylene Explanation: A bullet-proof material is made of polyethylene. It is a higher grade of the plastic found in Tupperware.

Polystyrene is a light, transparent, thermoplastic material used for making (A) Toys and combs (B) Packaging bags (C) Non-sticking utensils (D) Electrical insulation

Description : Polystyrene is a light, transparent, thermoplastic material used for making (A) Toys and combs (B) Packaging bags (C) Non-sticking utensils (D) Electrical insulation

Last Answer : (A) Toys and combs

What are the initial and final torque values for A321 main landing gear wheels?

Description : What are the initial and final torque values for A321 main landing gear wheels?

Last Answer : The initial or bearing setting torque value for A321 main landing gear wheel is 310 ft.-lbs. and the final torque value is 160 ft.-lbs.

The name of plastic polymer from which combs, toys, bowls etc., can be made, is (1) Polyurethane (2) Polystyrene (3) Metallic polysulphides (4) Teflon

Description : The name of plastic polymer from which combs, toys, bowls etc., can be made, is (1) Polyurethane (2) Polystyrene (3) Metallic polysulphides (4) Teflon

Last Answer : (2) Polystyrene Explanation: Polystyrene is an synthetic aromatic polymer made from the monomer styrene, a liquid petrochemical. It is one of the most widely used plastics. Uses include protective ... containers (such as "clamshells"), lids, bottles, trays, tumblers, and disposable cutlery.

Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten (A) Saturated polyester (B) Polyurethane (C) Polystyrene (D) Either (B) or (C)

Description : Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten (A) Saturated polyester (B) Polyurethane (C) Polystyrene (D) Either (B) or (C)

Last Answer : (D) Either (B) or (C)

Thiokol is nothing but (A) Polysulphide rubber (B) Polyamide fibre (C) Engineering plastic (D) Expanded polystyrene

Description : Thiokol is nothing but (A) Polysulphide rubber (B) Polyamide fibre (C) Engineering plastic (D) Expanded polystyrene

Last Answer : (A) Polysulphide rubber

__________ is a thermosetting plastic. (A) PVC (B) Polythene (C) Bakelite (D) Polystyrene

Description : __________ is a thermosetting plastic. (A) PVC (B) Polythene (C) Bakelite (D) Polystyrene

Last Answer : (C) Bakelite

Polystyrene is a __________ plastic at room temperature. (A) Ductile (B) Brittle (C) Malleable (D) None of these

Description : Polystyrene is a __________ plastic at room temperature. (A) Ductile (B) Brittle (C) Malleable (D) None of these

Last Answer : (B) Brittle

__________ is a thermosetting plastic. (A) Polythene (B) Epoxy polymer (C) P.V.C. (D) Polystyrene

Description : __________ is a thermosetting plastic. (A) Polythene (B) Epoxy polymer (C) P.V.C. (D) Polystyrene

Last Answer : (B) Epoxy polymer

The name of plastic polymer from which combs, toys, bowls etc., can be made, is (1) Polyurethane (2) Polystyrene (3) Metallic polysulphides (4) Teflon

Description : The name of plastic polymer from which combs, toys, bowls etc., can be made, is (1) Polyurethane (2) Polystyrene (3) Metallic polysulphides (4) Teflon

Last Answer : Polystyrene

How do I keep my nylons from running?

Description : How do I keep my nylons from running?

Last Answer : Put handcuffs on them and handcuff them to your bed. It’s hard for them to run after that.

Do I need to wear nylons for an interview?

Description : Do I need to wear nylons for an interview?

Last Answer : I never wear them, personally, but it does look more professional. Remember, beauty is pain.

Who invented nylons?

Description : Don't you know who the inventor was?

Last Answer : Otto Wichterle http://olomouc.idnes.cz/galerie-osobnosti-vedec-a-vynalezce-otto-wichterle-fxk-/olomouc-zpravy.aspx?c=A130809_1962355_olomouc-zpravy_stk

What type of nylons should I wear with a formal black silk dress?

Description : What type of nylons should I wear with a formal black silk dress?

Last Answer : Any thin nylon should go great with a long silk black dress.

The generic chemical name for the class of polymers which are commercially known as nylons is (A) Polyolefins (B) Polyamide (C) Polyacrylate (D) Polyurethane

Description : The generic chemical name for the class of polymers which are commercially known as nylons is (A) Polyolefins (B) Polyamide (C) Polyacrylate (D) Polyurethane

Last Answer : (B) Polyamide

The most commonly used resin for making reinforced plastic is (A) Unsaturated polyester (B) Polypropylene

Description : The most commonly used resin for making reinforced plastic is (A) Unsaturated polyester (B) Polypropylene

Last Answer : (A) Unsaturated polyester

Which of the following statement is false? (1) Polystyrene was discovered in 1839 by Edward Simon (2) It is used for making plastics and CD cases (3) It is not biodegradable (4) None of these

Description : Which of the following statement is false? (1) Polystyrene was discovered in 1839 by Edward Simon (2) It is used for making plastics and CD cases (3) It is not biodegradable (4) None of these 

Last Answer : None of these

Esters of fatty acids with higher alcohol other than glycerol are called as (A) Oils (B) Polyesters (C) Waxes (D) Terpenoids

Description : Esters of fatty acids with higher alcohol other than glycerol are called as (A) Oils (B) Polyesters (C) Waxes (D) Terpenoids

Last Answer : Answer : C

Which of the following is generally not drawn into fibre? (A) Polyamide (B) Unsaturated polyesters (C) Saturated polyesters (D) Polyacrylonitrile

Description : Which of the following is generally not drawn into fibre? (A) Polyamide (B) Unsaturated polyesters (C) Saturated polyesters (D) Polyacrylonitrile

Last Answer : (B) Unsaturated polyesters

Polyesters are manufactured by the Polycondensation reaction of (A) Dibasic acid with dihydric alcohol (B) A single monomer (C) Carboxylic acid with ethylene

Description : Polyesters are manufactured by the Polycondensation reaction of (A) Dibasic acid with dihydric alcohol (B) A single monomer (C) Carboxylic acid with ethylene

Last Answer : (A) Dibasic acid with dihydric alcohol

The major component of acrylic fibres is (A) Polyamides (B) Polyolefins(C) Polyacrylonitrile(D) Polyesters

Description : The major component of acrylic fibres is (A) Polyamides (B) Polyolefins (C) Polyacrylonitrile (D) Polyesters

Last Answer : (C) Polyacrylonitrile

Liners of bags are usually made of (A) Polythene (B) PVC (C) Polypropylene (D) Polyesters

Description : Liners of bags are usually made of (A) Polythene (B) PVC (C) Polypropylene (D) Polyesters

Last Answer : (C) Polypropylene

Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or thermosetting (C) Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

Description : Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or ... (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

Last Answer : D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

Parathion and Malathion are (A) Pesticides (B) Plasticisers for unsaturated polyesters (C) Pain-relieving drugs (analgesic) (D) Tranquilisers

Description : Parathion and Malathion are (A) Pesticides (B) Plasticisers for unsaturated polyesters (C) Pain-relieving drugs (analgesic) (D) Tranquilisers

Last Answer : (A) Pesticides

What material is most often used for the outer covering of coaxial cables? A. PVC B. Teflon C. PE D. Polystyrene

Description : What material is most often used for the outer covering of coaxial cables? A. PVC B. Teflon C. PE D. Polystyrene

Last Answer : A. PVC

Which of the following is not a thermoplastic material? (A) Epoxy polymer (B) PVC (C) Polystyrene (D) Polythene

Description : Which of the following is not a thermoplastic material? (A) Epoxy polymer (B) PVC (C) Polystyrene (D) Polythene

Last Answer : (A) Epoxy polymer

Splines are commonly used in (A) Machine tool gear box (B) Automobile gear box (C) Hoist and crane gear box (D) Bicycle

Description : Splines are commonly used in (A) Machine tool gear box (B) Automobile gear box (C) Hoist and crane gear box (D) Bicycle

Last Answer : (B) Automobile gear box

Identify the material commonly used for making coil of a resistacne box.

Description : Identify the material commonly used for making coil of a resistacne box.

Last Answer : Identify the material commonly used for making coil of a resistacne box. A. Molybdenum B. Manganese C. Manganin D. Magnesium

Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a (A) Cermet (B) Glass (C) Thermosetting plastic (D) Metallic alloy

Description : Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a (A) Cermet (B) Glass (C) Thermosetting plastic (D) Metallic alloy

Last Answer : (B) Glass

At ‘yield point’ of a copper wire A. the load hasn't exceeded the elastic limit yet; so, Hooke's law applies B. the load has already exceeded the elastic limit and the material has become plastic C. even the plastic stage has passed and the wire has snapped already D. Like Brass and Bronze, Copper has no yield poin

Description : At yield point' of a copper wire A. the load hasn't exceeded the elastic limit yet; so, Hooke's law applies B. the load has already exceeded the elastic limit and the material has become ... stage has passed and the wire has snapped already D. Like Brass and Bronze, Copper has no yield poin

Last Answer : the load has already exceeded the elastic limit and the material has become plastic

The index of refraction of a plastic material is 1.5. The speed of light in this material relative to that in a vacuum is: w) 2 x) 1.5 y) 2/3 z) 1/2

Description : The index of refraction of a plastic material is 1.5. The speed of light in this material relative to that in a vacuum is: w) 2 x) 1.5 y) 2/3 z) 1/2

Last Answer : ANSWER: Y -- 2/3

I have a vehicle that came standard with 16" wheels but now has older 15" wheels. What if any difference will be in fuel economy because of this?

Description : I have a vehicle that came standard with 16" wheels but now has older 15" wheels. What if any difference will be in fuel economy because of this?

Last Answer : You should be fine. If I remember correctly + or – 3% for tires. But if your not sure go to a tire shop and ask them.

Why are wheels fitted in traveling bags ? Explain ?

Description : Why are wheels fitted in traveling bags ? Explain ?

Last Answer : If there were no wheels in the traveling bag, there would be a lot of friction or slippery friction while pulling it. The value of cyclic friction is lower than that of vortex friction. So the wheels are fitted in the traveling bag for the purpose of easy pulling and avoiding high quality friction.

Ondometer is a - (1) Measuring instrument for distance covered by motor wheels (2) Measuring instrument for frequency of electromagnetic waves (3) Device for measuring sound intensity (4) Measuring instrument for electric power

Description : Ondometer is a - (1) Measuring instrument for distance covered by motor wheels (2) Measuring instrument for frequency of electromagnetic waves (3) Device for measuring sound intensity (4) Measuring instrument for electric power

Last Answer : (2) Measuring instrument for frequency of electromagnetic waves

Railway tracks are banked on curves so that : (1) the train may not fall down inwards. (2) the weight of the train may be reduced. (3) necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track. (4) no frictional force may be produced between the wheels and the track.

Description : Railway tracks are banked on curves so that : (1) the train may not fall down inwards. (2) the weight of the train may be reduced. (3) necessary centripetal force may be obtained from the ... normal reaction due to track. (4) no frictional force may be produced between the wheels and the track.

Last Answer : (3) necessary centripetal force may be obtained from the horizontal component of the normal reaction due to track. Explanation: A vehicle moving at a fast speed on a straight rail/ road has ... it experiences an additional force, termed as centripetal force, acting towards the centre of the circle.

Railway tracks are banked on curves so that – (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the tracks and the wheels of the train (3)Necessary centripetal force may be obtained from the horizontal component of the weight of the train (4) The train may not fall down inwards

Description : Railway tracks are banked on curves so that - (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the ... the horizontal component of the weight of the train (4) The train may not fall down inwards

Last Answer : (3) Necessary centripetal force may be obtained from the horizontal component of the weight of the train

The motion of the wheels of a bullockcart while moving on the road is an example of – (1) Oscillatory and rotatory motion (2) Oscillatory and translatory motion (3) Translatory and rotatory motion (4) Translatory motion only

Description : The motion of the wheels of a bullockcart while moving on the road is an example of – (1) Oscillatory and rotatory motion (2) Oscillatory and translatory motion (3) Translatory and rotatory motion (4) Translatory motion only

Last Answer : (3) Translatory and rotatory motion Explanation: There are four basic types of motion in mechanical systems: Rotary, Linear, Reciprocating and Oscillating motion. Rotatory motion is turning round in a circle, ... . As a matter of fact, translatory motion and rotatory motion occur at the same time.

The motion of the wheels of a bullock-cart while moving on the road is an example of (1) Oscillatory and rotatory motion (2) Oscillatory and translatory motion (3) Translatory and rotatory motion (4) Translatory motion only

Description : The motion of the wheels of a bullock-cart while moving on the road is an example of (1) Oscillatory and rotatory motion (2) Oscillatory and translatory motion (3) Translatory and rotatory motion (4) Translatory motion only

Last Answer : Translatory and rotatory motion

Railway tracks are banked on curves so that (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the tracks and the wheels of the train (3) Necessary centripetal force may be obtained from the horizontal component of the weight of the train (4) The train may not fall down inwards

Description : Railway tracks are banked on curves so that (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the ... the horizontal component of the weight of the train (4) The train may not fall down inwards

Last Answer : Necessary centripetal force may be obtained from the horizontal component of the weight of the train

While ascending a hill, the driver of the vehicle keeps the gear ratio – (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Description : While ascending a hill, the driver of the vehicle keeps the gear ratio – (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Last Answer : (4) either equal to or greater than 1 Explanation: While ascending a hill Gear Ratio should be "Either equal to or greater than 1?. Gear Ratio is the ratio between angular velocity of input gear to the angular velocity of output gear. It prevents the vehicle from stalling.

While ascending a hill, the driver of the vehicle keeps the gear ratio (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Description : While ascending a hill, the driver of the vehicle keeps the gear ratio (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Last Answer : either equal to or greater than 1

__________ is the most commonly used 'filter aid'. (A) Diatomaceous earth (B) Fuller's earth (C) Vermiculite (D) Semi-plastic clay

Description : __________ is the most commonly used 'filter aid'. (A) Diatomaceous earth (B) Fuller's earth (C) Vermiculite (D) Semi-plastic clay

Last Answer : (A) Diatomaceous earth

The three essential types of fiber commonly used today except: ∙ A. Plastic core and cladding ∙ B. Plastic core and glass cladding ∙ C. Glass core and glass cladding (SCS) ∙ D. Glass core and plastic cladding (PCS)

Description : The three essential types of fiber commonly used today except: ∙ A. Plastic core and cladding ∙ B. Plastic core and glass cladding ∙ C. Glass core and glass cladding (SCS) ∙ D. Glass core and plastic cladding (PCS)

Last Answer : B. Plastic core and glass cladding

Why plastic containers are more commonly used now a days? Write its demerits.

Description : Why plastic containers are more commonly used now a days? Write its demerits.

Last Answer : Plastic containers are more commonly used now a days for following advantages: 1.They are light in weight and can be handled easily 2.They are poor conductor of heat . 3.They have sufficient ... solution. 5.They are relatively expensive. 6.Special type of gum or adhesive required for labelling.

What makes polystyrene good?

Description : How to cut polystyrene so that it doesn't break?

Last Answer : I used to do it with hot resistance wire

Insulation of HUPky with polystyrene?

Description : Hi. I have such a problem, we have thin walls and since there is a built-in HUP in the northern wall, only 10 cm of masonry remains behind it and a room follows. The wall in this place is ... contents except for the clock, or HUPs where polystyrene was all over the door, is there a rule? Thanks

Last Answer : It is not advisable to play with gas, so I would not rely on lay advice. Try to contact the gas provider or the supplier that built the HUP. It had to be according to the project and therefore according to the valid standard. But it's definitely not okay. :)