Point out the wrong statement about the magnetic properties of soft iron and steel.

Point out the wrong statement about the magnetic properties of soft iron and steel.
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Point out the wrong statement about the magnetic properties of soft iron and steel. A. The ... to slag formation is minimised in open hearth process
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Pick out the wrong statement. (A) A ferromagnetic material becomes paramagnetic above the 'Curie temperature' (B) Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials (C) Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces (D) Tungsten steel and alnico are not hard magnetic materials

Description : Pick out the wrong statement. (A) A ferromagnetic material becomes paramagnetic above the 'Curie temperature' (B) Permanent magnets are made of hard materials, whereas electromagnets require soft ... hysterisis loss and coercive forces (D) Tungsten steel and alnico are not hard magnetic materials

Last Answer : Option D

Pick out the wrong statement. (A) A soft magnetic material should have high permeability and small area of hysteresis loop (B) Poisson's ratio of high melting point metals is more than unity (C) Solders generally melt at less than 185°C (D) Steel produced by B.O.F process is ideally suited for manufacturing flat product

Description : Pick out the wrong statement. (A) A soft magnetic material should have high permeability and small area of hysteresis loop (B) Poisson's ratio of high melting point metals is more than unity (C) ... less than 185°C (D) Steel produced by B.O.F process is ideally suited for manufacturing flat product

Last Answer : Option B

Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Description : Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Last Answer : (4) Soft iron Explanation: Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.

Magnetic keepers are pieces of (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Description : Magnetic keepers are pieces of (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Last Answer :  Soft iron

______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ? (a) Grey cast-iron (b) Cast steel (c) High carbon steel (d) Stainless steel

Description : ______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ? (a) Grey cast-iron (b) Cast steel (c) High carbon steel (d) Stainless steel

Last Answer : (b) Cast steel

Pick out the correct statement. (A) Stainless steel is nothing but chromium coated steel (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal (C) Plastic deformation of a material is its temporary distortion under the action of applied stress (D) Rusting of iron is not electrochemical in nature

Description : Pick out the correct statement. (A) Stainless steel is nothing but chromium coated steel (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal (C) ... its temporary distortion under the action of applied stress (D) Rusting of iron is not electrochemical in nature

Last Answer : (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal

Pick out the wrong statement. (A) Cold cracking of a weld is due to the presence of hydrogen gas in the weld (B) True stress is given by, σ = σE (1 + εE), where σE and εE are engineering stress and engineering strain respectively (C) Phosphorous can be easily recovered in the iron blast furnace (D) High residual stress at the surface is beneficial for fatigue properties of a material

Description : Pick out the wrong statement. (A) Cold cracking of a weld is due to the presence of hydrogen gas in the weld (B) True stress is given by, σ = σE (1 + εE), where σE and εE ... in the iron blast furnace (D) High residual stress at the surface is beneficial for fatigue properties of a material

Last Answer : Option C

Draw B-H curve for magnetic material and state its nature. State the significance of hysteresis loop. Also draw the hysteresis loop for hard steel and soft steel.

Description : Draw B-H curve for magnetic material and state its nature. State the significance of hysteresis loop. Also draw the hysteresis loop for hard steel and soft steel. 

Last Answer : B-H curve for magnetic material: The B-H curve is the graphical representation of relation between flux density (B) and applied field strength (H), with H plotted on the x-axis and B plotted on ... or crossing an air gap tends to bulge outwards the iron ring, this effect is called as Fringing .

Pick out the wrong statement (A) Hardening makes the steel more brittle (B) High alloy steels contain more than 50% alloying element (C) 18/8 stainless steel is a magnetic steel (D) Both (B) and (C)

Description : Pick out the wrong statement (A) Hardening makes the steel more brittle (B) High alloy steels contain more than 50% alloying element (C) 18/8 stainless steel is a magnetic steel (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Pick out the wrong statement. (A) Weldability of high carbon steel is poorer compared to low carbon steel (B) Invar is a magnetic alloy (C) Magnetic permeability of the diamagnetic material is less than one (D) Martenistic transformation never goes to completion (i.e., 100%) at room temperature

Description : Pick out the wrong statement. (A) Weldability of high carbon steel is poorer compared to low carbon steel (B) Invar is a magnetic alloy (C) Magnetic permeability of the diamagnetic material is less than one (D) Martenistic transformation never goes to completion (i.e., 100%) at room temperature

Last Answer : Option B

Point out the wrong statement. a) The massive scale of cloud computing systems was enabled by the popularization of the Internet b) Soft computing represents a real paradigm shift in the way in which systems are deployed c) Cloud computing makes the long-held dream of utility computing possible with a pay-as-you-go, infinitely scalable, universally available system d) All of the mentioned

Description : Point out the wrong statement. a) The massive scale of cloud computing systems was enabled by the popularization of the Internet b) Soft computing represents a real paradigm shift in the way in ... with a pay-as-you-go, infinitely scalable, universally available system d) All of the mentioned

Last Answer : Soft computing represents a real paradigm shift in the way in which systems are deployed

Point out the wrong statement. a) The massive scale of cloud computing systems was enabled by the popularization of the Internet b) Soft computing represents a real paradigm shift in the way in which systems are deployed c) Cloud computing makes the long-held dream of utility computing possible with a pay-as-you-go, infinitely scalable, universally available system d) All of the mentioned

Description : Point out the wrong statement. a) The massive scale of cloud computing systems was enabled by the popularization of the Internet b) Soft computing represents a real paradigm shift in the way in ... with a pay-as-you-go, infinitely scalable, universally available system d) All of the mentioned

Last Answer : Soft computing represents a real paradigm shift in the way in which systems are deployed

When placed in a magnetic field, which of the materials listed will maintain the highest permeability? A. Glass B. Bakelite C. Soft iron D. Aluminum

Description : When placed in a magnetic field, which of the materials listed will maintain the highest permeability? A. Glass B. Bakelite C. Soft iron D. Aluminum

Last Answer : Answer: C

A direct current passing through a wire coiled around a soft iron core is the description of a simple ____________. A. magnetic shield B. electromagnet C. piezoelectric device D. electromagnetic domain

Description : A direct current passing through a wire coiled around a soft iron core is the description of a simple ____________. A. magnetic shield B. electromagnet C. piezoelectric device D. electromagnetic domain

Last Answer : Answer: B

By inserting a soft iron piece into solenoid, what does the strength of the magnetic field?

Description : By inserting a soft iron piece into solenoid, what does the strength of the magnetic field?

Last Answer : Increase

In transformer, the core is made up of soft iron in order to pass the maximum A. flux B. current C. magnetic flux D. voltage

Description : In transformer, the core is made up of soft iron in order to pass the maximum A. flux B. current C. magnetic flux D. voltage

Last Answer : magnetic flux

The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields (a) meter is surrounded by strong magnetic fields (b) a soft iron shielding is used (c) a plastic shielding is provided (d) a shielding of anon-magnetic material is used

Description : The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields (a) meter is surrounded by strong magnetic fields (b) a soft ... is used (c) a plastic shielding is provided (d) a shielding of anon-magnetic material is used

Last Answer : (b) a soft iron shielding is used

Which of the following metals is used in the electromagnets? (a) Soft iron (b) Stainless steel (c) Cobalt (d) Copper

Description : Which of the following metals is used in the electromagnets? (a) Soft iron (b) Stainless steel (c) Cobalt (d) Copper

Last Answer : Ans:(a)

Which of the following would be most suitable for making an electromagnet? (a) Copper (b) Tungsten (c) Soft iron (d) Steel

Description : Which of the following would be most suitable for making an electromagnet? (a) Copper (b) Tungsten (c) Soft iron (d) Steel

Last Answer : Ans:(c)

Electromagnet is constructed with which of the following? (1) Steel (2) Soft Iron (3) Aluminium (4) Nickel

Description : Electromagnet is constructed with which of the following? (1) Steel (2) Soft Iron (3) Aluminium (4) Nickel

Last Answer : (2) Soft Iron Explanation: An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.

The best material for the core of a transformer is – (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

Description : The best material for the core of a transformer is – (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

Last Answer : (4) soft iron Explanation: Iron has a very large magnetic response: it greatly amplifies an applied magnetic field. The transformer's ability to transfer energy depends on the strength of the magnetic ... field is amplified. The input energy can then be lower while still having the same effect.

A mould board of MB plough is made of? a Cast iron b Chilled cast iron c Mild steel d Soft centre steel

Description : A mould board of MB plough is made of? a Cast iron b Chilled cast iron c Mild steel d Soft centre steel

Last Answer : d Soft centre steel

The joint for soldering is supported by binding wire made of (A) Mild steel (B) Copper (C) Soft iron (D) Stainless steel

Description : The joint for soldering is supported by binding wire made of (A) Mild steel (B) Copper (C) Soft iron (D) Stainless steel

Last Answer : Option C

Indicate which of the following material does not retain magnetism permanently. (a) Soft iron (b) Stainless steel (e) Hardened steel (d) None of the above

Description : Indicate which of the following material does not retain magnetism permanently. (a) Soft iron (b) Stainless steel (e) Hardened steel (d) None of the above

Last Answer : (a) Soft iron

.The land side of a mould board plough is made of: A. Malleable iron B. Forged steel C. C45 steel D. Soft Centre steel

Description : .The land side of a mould board plough is made of: A. Malleable iron B. Forged steel C. C45 steel D. Soft Centre steel

Last Answer : D. Soft Centre steel

The landside of a mould board plough is made of: a) Malleable iron b) Forged steel c) C45 steel d) Soft centre steel

Description : The landside of a mould board plough is made of: a) Malleable iron b) Forged steel c) C45 steel d) Soft centre steel

Last Answer : d) Soft centre steel

Mould board are usually made from a. Soft centre steel b. Hardened carbon steel c. Chilled cast iron d. Mild steel

Description : Mould board are usually made from a. Soft centre steel b. Hardened carbon steel c. Chilled cast iron d. Mild steel

Last Answer : a. Soft centre steel

________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable. (a) Cast steel (b) Aluminium (c) Soft steel (d) Cast iron

Description : ________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable. (a) Cast steel (b) Aluminium (c) Soft steel (d) Cast iron

Last Answer : (d) Cast iron

Electromagnet is constructed with which of the following ? (1) Steel (2) Soft Iron (3) Aluminium (4) Nickel

Description : Electromagnet is constructed with which of the following ? (1) Steel (2) Soft Iron (3) Aluminium (4) Nickel

Last Answer : Soft Iron

The best material for the core of a transformer is (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

Description : The best material for the core of a transformer is (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

Last Answer : soft iron

State Magneto-striction. Draw Hysteresis loop for : (i) High silicon steel (ii) Copper (iii) Soft iron (iv) Wood

Description : State Magneto-striction. Draw Hysteresis loop for : (i) High silicon steel (ii) Copper (iii) Soft iron (iv) Wood

Last Answer : Magneto-striction: It is the change in dimensions of ferro magnetic material when it is magnetized for eg. Silicon steel, iron or any ferromagnetic material.  i) Hysteresis loop for High silicon steel :  ... loop for Soft iron :  iv) Hysteresis loop for Copper and Wood : 

Addition of tungsten to steel imparts (A) Magnetic properties (B) Cutting hardness (C) Corrosion resistance (D) Ductility

Description : Addition of tungsten to steel imparts (A) Magnetic properties (B) Cutting hardness (C) Corrosion resistance (D) Ductility

Last Answer : (B) Cutting hardness

Depending on the chemical composition and mechanical properties, iron may be classified as (A) Cast iron (B) Wrought iron (C) Steel (D) All the above

Description : Depending on the chemical composition and mechanical properties, iron may be classified as (A) Cast iron (B) Wrought iron (C) Steel (D) All the above

Last Answer : Answer: Option D

Which of the following gradients exerts maximum influence on properties of steel? (A) Iron (B) Carbon (C) Manganese (D) Sulphur

Description : Which of the following gradients exerts maximum influence on properties of steel? (A) Iron (B) Carbon (C) Manganese (D) Sulphur

Last Answer : Answer: Option B

Pick out the wrong statement. (A) Economy of a multiple effect evaporator is not influenced by the boiling point elevation (B) Two identical cubes of iron and copper will have the same heat content under the same conditions of temperature (C) Double pipe heat exchangers are mostly used in the field of refrigeration (D) Finned tube heat exchangers are suitable for heating air by steam

Description : Pick out the wrong statement. (A) Economy of a multiple effect evaporator is not influenced by the boiling point elevation (B) Two identical cubes of iron and copper will have the same heat ... in the field of refrigeration (D) Finned tube heat exchangers are suitable for heating air by steam

Last Answer : (B) Two identical cubes of iron and copper will have the same heat content under the same conditions of temperature

The correct statement about the magnetic properties of `[Fe(CN)_(6)]^(3-) and [FeF_(6)]^(3-) ` is : (Z=26)

Description : The correct statement about the magnetic properties of `[Fe(CN)_(6)]^(3-) and [FeF_(6)]^(3-) ` is : (Z=26)

Last Answer : The correct statement about the magnetic properties of `[Fe(CN)_(6)]^(3-) and [FeF_(6)]^(3-) ` ... ` is paramagnetic, `[FeF_(6)]^(3-)` is diamagnetic

Curie point is the temperature at which (1) Matter becomes radioactive (2) A metal loses magnetic properties (3) A metal loses conductivity (4) Transmutation of metal occurs

Description : Curie point is the temperature at which (1) Matter becomes radioactive (2) A metal loses magnetic properties (3) A metal loses conductivity (4) Transmutation of metal occurs

Last Answer : (2) A metal loses magnetic properties Explanation: In physics and materials science, the Curie temperature (TO, or Curie point, is the temperature at which a ferromagnetic or a ... in piezoelectric materials to refer to the temperature at which spontaneous polarization is lost on heating.

Curie point is the temperature at which (1) Matter becomes radioactive (2) A metal loses magnetic properties. (3) A metal loses conductivity (4) Transmutation of metal occurs.

Description : Curie point is the temperature at which (1) Matter becomes radioactive (2) A metal loses magnetic properties. (3) A metal loses conductivity (4) Transmutation of metal occurs.

Last Answer : A metal loses magnetic properties.

Pick out the wrong statement. (A) Cold SBR is superior as compared to hot SBR (B) Polymerisation temperature can modify the properties of SBR (C) Production of cold SBR employs lower pressure as compared to that of hot SBR (D) None of these

Description : Pick out the wrong statement. (A) Cold SBR is superior as compared to hot SBR (B) Polymerisation temperature can modify the properties of SBR (C) Production of cold SBR employs lower pressure as compared to that of hot SBR (D) None of these

Last Answer : (D) None of these

Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct process of by-product recovery (C) A high swelling index number of coking coal indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas

Description : Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct ... indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas

Last Answer : (C) A high swelling index number of coking coal indicates poor caking properties of coal

Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C(B) Most of the enzyme catalysed reactions involve at least two substrates (C) Enzymes help in increasing the activation energy of the reaction (D) Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

Description : Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C ... in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

Last Answer : (C) Enzymes help in increasing the activation energy of the reaction

Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have (A) High electrical insulation properties (B) Sharp melting points (C) Low co-efficient of thermal expansion (D) Compressive strength much greater than their tensile strengths

Description : Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have (A) High electrical insulation properties (B) Sharp melting points (C) Low co-efficient of thermal expansion (D) Compressive strength much greater than their tensile strengths

Last Answer : (B) Sharp melting points

Pick out the wrong statement(A) Cold rubber (SBR) is superior as compared to hot rubber (SBR)(B) Polymerisation temperature can modify the properties of SBR(C) Production of cold SBR employs lower pressure as compared to that ofhot SBR(D) None of these

Description : Pick out the wrong statement (A) Cold rubber (SBR) is superior as compared to hot rubber (SBR) (B) Polymerisation temperature can modify the properties of SBR (C) Production of cold SBR employs lower pressure as compared to that of hot SBR (D) None of these

Last Answer : (D) None of these

Pick out the wrong statement (A) Phase rule variables are intensive properties (B) Heat and work are both state function (C) The work done by expansion of a gas in vacuum is zero (D) CPand CVare state function

Description : Pick out the wrong statement (A) Phase rule variables are intensive properties (B) Heat and work are both state function (C) The work done by expansion of a gas in vacuum is zero (D) CPand CVare state function

Last Answer : (B) Heat and work are both state function

Permanent magnets are made of (A) soft magnetic materials. (B) hard magnetic materials. (C) semi conductors. (D) super conductors.

Description : Permanent magnets are made of (A) soft magnetic materials. (B) hard magnetic materials. (C) semi conductors. (D) super conductors.

Last Answer : (B) hard magnetic materials.

The covers of electrical machines are made of (A) soft magnetic materials. (B) hard magnetic materials. (C) super conductors. (D) semiconductors.

Description : The covers of electrical machines are made of (A) soft magnetic materials. (B) hard magnetic materials. (C) super conductors. (D) semiconductors.

Last Answer : (A) soft magnetic materials.

are used for construction of core of electromagnets. (a) Soft magnetic materials (b) Hard magnetic materials (c) Either (a) or (b) (d) None of the above

Description : are used for construction of core of electromagnets. (a) Soft magnetic materials (b) Hard magnetic materials (c) Either (a) or (b) (d) None of the above

Last Answer : (a) Soft magnetic materials

Draw the B-H curve for hard and soft magnetic material.

Description : Draw the B-H curve for hard and soft magnetic material.

Last Answer : Diagram: The B-H curve for hard and soft magnetic material

Compare soft magnetic materials and hard magnetic materials.

Description : Compare soft magnetic materials and hard magnetic materials.

Last Answer : Sr. No. Soft magnetic materials  Hard magnetic materials  1 It has high resistivity It has low resistivity 2 It has low coercivity It has high coercivity 3 It has ... It has high residual magnetism 4 It is easily magnetized It is not easily magnetized.