The materials having low retentivity are suitable for making

by

1 Answer

Answer :

The materials having low retentivity are suitable for making temporary magnets.

by

Related questions

The materials having low retentivity are suitable for making (a) weak magnets (b) temporary magnets (c) permanent magnets (d) none of the above

Description : The materials having low retentivity are suitable for making (a) weak magnets (b) temporary magnets (c) permanent magnets (d) none of the above

Last Answer : (b) temporary magnets

The retentivity (a property) of material is useful for the construction of

Last Answer : The retentivity (a property) of material is useful for the construction of permanent magnets.

Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity.

Description : Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity.

Last Answer : Those materials are well suited for making permanent magnets which have high retentivity and high coercivity.

Materials subjected to rapid reversal of magnetism should have (a) large area oiB-H loop (b) high permeability and low hysteresis loss (c) high co-ercivity and high retentivity (d) high co-ercivity and low density

Description : Materials subjected to rapid reversal of magnetism should have (a) large area oiB-H loop (b) high permeability and low hysteresis loss (c) high co-ercivity and high retentivity (d) high co-ercivity and low density

Last Answer : (b) high permeability and low hysteresis loss

Low resistivity materials are used in

Last Answer : Low resistivity materials are used in transformer, motor and generator windings, transmission and distribution lines, house wiring.

What is retentivity?

Description : What is retentivity?

Last Answer : The ability of a material to retain magnetism

The energy required to magnetize and demagnetize is called a) Saturation b) Retentivity c) Coercivity d) Hysteresis lossThe energy required to magnetize and demagnetize is called a) Saturation b) Retentivity c) Coercivity d) Hysteresis loss

Description : The energy required to magnetize and demagnetize is called a) Saturation b) Retentivity c) Coercivity d) Hysteresis loss

Last Answer : d) Hysteresis loss

The unit of retentivity is?

Description : The unit of retentivity is?

Last Answer : The unit of retentivity is weber/sq. m.

The magnetic materials exhibit the property of magnetisation because of

Last Answer : The magnetic materials exhibit the property of magnetisation because of spin of nucleus.

Paramagnetic materials have relative permeability

Last Answer : slightly more than unity

Materials subjected to rapid reversal of magnetism should have

Last Answer : Materials subjected to rapid reversal of magnetism should have high permeability and low hysteresis loss.

Effect of moisture on the insulating materials is to

Last Answer : Effect of moisture on the insulating materials is to decrease dielectric constant, decrease dielectric strength, decrease insulation resistance, increase dielectric loss.

Piezoelectric materials serve as a source of _____ .

Description : Piezoelectric materials serve as a source of _____ .

Last Answer : Piezoelectric materials serve as a source of ultrasonic waves.

High resistivity materials are used in?

Description : High resistivity materials are used in?

Last Answer : High resistivity materials are used in precision instruments, heating elements, motor starters, incandescent lamps.

The most effective and quickest may of making a magnet from soft iron is by

Last Answer : The most effective and quickest may of making a magnet from soft iron is by placing it inside a coil carrying current.

______ is most commonly used for making magnetic recording tape.

Description : ______ is most commonly used for making magnetic recording tape.

Last Answer : Ferric oxide is most commonly used for making magnetic recording tape.

A filter press is (A) A batch filter (B) Not suitable, if the liquid is the main product (C) Having prohibitively high maintenance cost (D) Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

Description : A filter press is (A) A batch filter (B) Not suitable, if the liquid is the main product (C) Having prohibitively high maintenance cost (D) Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

Last Answer : (A) A batch filter

Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its (A) High strength to weight ratio (B) Low temperature strength properties (C) Its ability to be cast, rolled, forged & stamped (D) High strength and corrosion & oxidation-resistance at elevated temperature

Description : Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its (A) High strength to weight ratio (B) Low temperature strength properties (C) Its ability ... rolled, forged & stamped (D) High strength and corrosion & oxidation-resistance at elevated temperature

Last Answer : (A) High strength to weight ratio

The metal having the lowest temperature coefficient of resistance is

Description :  The metal having the lowest temperature coefficient of resistance is

Last Answer : The metal having the lowest temperature coefficient of resistance is gold.

Substances whose specific resistance abruptly decreases at very low temperature are called

Last Answer : Substances whose specific resistance abruptly decreases at very low temperature are called superconductors.

Better classroom management means (a) per group work and better interaction among pupils (b) prior preparation of teacher in the making of suitable aids (c) Punctuality of the teachers in coming in the class and finishing the course in time (d) Getting the attention and cooperation of all the students before starting the class/ task (e) Moving around the room to identify pupils having or creating problems (f) Avoid teaching when pupils are not in proper mood (g) All of these

Description : Better classroom management means (a) per group work and better interaction among pupils (b) prior preparation of teacher in the making of suitable aids (c) Punctuality of the teachers in coming in the ... creating problems (f) Avoid teaching when pupils are not in proper mood (g) All of these

Last Answer : (g) All of these

Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel (C) Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these

Description : Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile ... and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these

Last Answer : (D) None of these

Which of the following is the most suitable for extraction in a system having very low density difference? (A) Mixer-settler extractor (B) Centrifugal extractor (C) Pulsed extractor (D) Packed extraction tower

Description : Which of the following is the most suitable for extraction in a system having very low density difference? (A) Mixer-settler extractor (B) Centrifugal extractor (C) Pulsed extractor (D) Packed extraction tower

Last Answer : (B) Centrifugal extractor

In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation? (a) Gamete Intracytoplasmic Fallopian Transfer (b) Artificial Insemination (c) Intracytoplasmic sperm injection (d) Intrauterine transfer

Description : In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation? (a) Gamete Intracytoplasmic Fallopian Transfer (b) Artificial Insemination (c) Intracytoplasmic sperm injection (d) Intrauterine transfer

Last Answer : (b) Artificial Insemination

In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ? (1) Gamete intracytoplasmic fallopian transfer (2) Artificial Insemination (3) Intracytoplasmic sperm injection (4) Intrauterine transfer

Description : In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilisation ? (1) Gamete intracytoplasmic fallopian transfer (2) Artificial Insemination (3) Intracytoplasmic sperm injection (4) Intrauterine transfer

Last Answer : (2) Artificial Insemination

What Categories of materials suitable for use as containers of ionic solutions?

Description : What Categories of materials suitable for use as containers of ionic solutions?

Last Answer : Glazed ceramics,plastic ,glass

__________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials. (A) Bucket (B) Belt (C) Screw (D) Apron

Description : __________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials. (A) Bucket (B) Belt (C) Screw (D) Apron

Last Answer : (B) Belt

Screw conveyors are (A) Run at very high rpm (B) Suitable for sticky materials (C) Suitable for highly abrasive materials (D) All (A), (B) and (C)

Description : Screw conveyors are (A) Run at very high rpm (B) Suitable for sticky materials (C) Suitable for highly abrasive materials (D) All (A), (B) and (C)

Last Answer : (B) Suitable for sticky materials

Bucket elevators are not suitable for the vertical lifting of __________ materials. (A) Fine (e.g. - 200 mesh size coal) (B) Sticky (e.g. clay paste) (C) Small lumpy (e.g. grains and sand) (D) Free flowing

Description : Bucket elevators are not suitable for the vertical lifting of __________ materials. (A) Fine (e.g. - 200 mesh size coal) (B) Sticky (e.g. clay paste) (C) Small lumpy (e.g. grains and sand) (D) Free flowing

Last Answer : (B) Sticky (e.g. clay paste

For sizing of fine materials, the most suitable equipment is a (A) Trommel (B) Grizzly (C) Shaking screen (D) Vibrating screen

Description : For sizing of fine materials, the most suitable equipment is a (A) Trommel (B) Grizzly (C) Shaking screen (D) Vibrating screen

Last Answer : (D) Vibrating screen

__________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc. (A) Flight (B) Screw (C) Drag (D) Belt

Description : __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc. (A) Flight (B) Screw (C) Drag (D) Belt

Last Answer : (A) Flight

Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the (A) Light metal powder down upto 4 mesh size (B) Dry chemicals (C) Heavy tonnages of rocks or gravel (D) Powdered food & granular materials

Description : Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the ... Dry chemicals (C) Heavy tonnages of rocks or gravel (D) Powdered food & granular materials

Last Answer : (C) Heavy tonnages of rocks or gravel

Gyratory crushers compared to the reciprocating jaw crushers (A) Have greater capacity per unit of discharge area (B) Crush intermittently (C) Are less suitable for coarse materials (D) Have less steady power consumption

Description : Gyratory crushers compared to the reciprocating jaw crushers (A) Have greater capacity per unit of discharge area (B) Crush intermittently (C) Are less suitable for coarse materials (D) Have less steady power consumption

Last Answer : (A) Have greater capacity per unit of discharge area

Which of the following material handling equipments is not suitable for moving materials in varying paths? (A) Hand trolley (B) Belt conveyor (C) Crane (D) Truck

Description : Which of the following material handling equipments is not suitable for moving materials in varying paths? (A) Hand trolley (B) Belt conveyor (C) Crane (D) Truck

Last Answer : (B) Belt conveyor

hich of the following is the most suitable abrasive for grinding high tensile strength materials? (A) Silicon carbide (B) Corundum (C) Aluminium oxide (D) Boron carbide

Description : hich of the following is the most suitable abrasive for grinding high tensile strength materials? (A) Silicon carbide (B) Corundum (C) Aluminium oxide (D) Boron carbide

Last Answer : Option C

Discuss functions of flux used to welding. Identify properties of material suitable for flux and state two materials used as flux.

Description : Discuss functions of flux used to welding. Identify properties of material suitable for flux and state two materials used as flux.

Last Answer : Functions of flux 1. A flux is a material used for removal of oxides and other undesirable substances. 2. Flux is a material used to prevent dissolve or facilitate removal of oxide. 3. ... in liquid 5. For welding alloy steel:- Mixture of boric acid , Dehydrated borax and calcium fluorides

State functions and name suitable materials for connecting rod. Select suitable crosssection for connecting rod with justification

Description : State functions and name suitable materials for connecting rod. Select suitable crosssection for connecting rod with justification

Last Answer : Functions of connecting rod: A connecting rod, also called a con rod, is the part of a piston engine which connects the piston to the crankshaft. Together with the crank, the connecting rod ... a connecting rod may have rectangular section. For slow speed engines, circular sections may be used.

Ferromagnets

Description : Ferromagnets

Last Answer : Ferromagnets Only certain materials, such as iron, cobalt, nickel, and gadolinium, exhibit strong magnetic effects. Such materials are called ferromagnetic, after the Latin word for iron, ... licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

The attraction capacity of electromagnet will increase if the

Last Answer : Atrraction  capacity  will  increase  if  supply  current  is  increased.

Temporary magnets are used in

Last Answer : Temporary magnets are used in loud-speakers,generators, motors.

Main causes of noisy solenoid are

Last Answer : Main causes of noisy solenoid are strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force, uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts.

Core of an electromagnet should have

Last Answer : Core of an electromagnet should have low coercivity, high susceptibility.

Magnetism of a magnet can be destroyed by

Last Answer : Magnetism of a magnet can be destroyed by heating, hammering, by inductive action of another magnet.

The bar magnet has

Last Answer : The bar magnet has the dipole moment.

The stray line of magnetic flux is defined as

Last Answer : The stray line of magnetic flux is defined as a line of magnetic flux which does not follow the designed path.

How does the magnetic compass needle behave in a magnetic field ?

Last Answer : It assures a position which follows a line of magnetic flux

The initial permeability of an iron rod is

Last Answer : The initial permeability of an iron rod is the permeability almost in non-magnetised state.

The magnetic reluctance of a material

Last Answer : The magnetic reluctance of a material decreases with increasing cross-sectional area of the material.

The magneto-motive force is

Last Answer : The magneto-motive force is the sum of all currents embraced by one line of magnetic field.

The uniform magnetic field is

Last Answer : The uniform magnetic field is the field in which all lines of magnetic flux are parallel and equidistant.