When electricity runs through coiled wire the coil becomes a what?

When electricity runs through coiled wire the coil becomes a what?
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A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the coil is (A) WR3n/Cr4 (B) 2WR3n/Cr4 (C) 3WR3n/Cr4 (D) 4WR3n/Cr

Description : A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If  the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the  coil is  (A) WR3n/Cr4 (B) 2WR3n/Cr4 (C) 3WR3n/Cr4 (D) 4WR3n/Cr

Last Answer : (D) 4WR3n/Cr

A closely coiled helical spring of radius R, contains n turns and is subjected to an axial loadW. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the stress developed in the helical spring is (A) WR/ 3 (B) 2WR/ 3 (C) 2WR/ 2 (D) 4WR/ 2

Description : A closely coiled helical spring of radius R, contains n turns and is subjected to an axial loadW. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the stress developed in the helical spring is (A) WR/ 3 (B) 2WR/ 3 (C) 2WR/ 2 (D) 4WR/ 2

Last Answer : (B) 2WR/ 3

The close-coiled helical springs ‘A’ and ‘B’ are of same material, same coil diameter, same wire diameter and subjected to same load. If the number of turns of spring ‘A’ is half that of spring ‘B’, the ratio of deflection of spring ‘A’ to spring ‘B’ is (a)1/2 (b) 1 (c) 2 (d) 4

Description : The close-coiled helical springs ‘A’ and ‘B’ are of same material, same coil diameter, same wire diameter and subjected to same load. If the number of turns of spring ‘A’ is half that of spring ‘B’, the ratio of deflection of spring ‘A’ to spring ‘B’ is (a)1/2 (b) 1 (c) 2 (d) 4

Last Answer : (a)1/2

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

whoso Rikki-tikki knew Nagaina had gone away. Nag coiled himself down, coil by coil, round the bulge at the bottom of the water-jar, and Rikki-tikki stayed still as death.?

Description : whoso Rikki-tikki knew Nagaina had gone away. Nag coiled himself down, coil by coil, round the bulge at the bottom of the water-jar, and Rikki-tikki stayed still as death.?

Last Answer : so Rikki-tikki knew Nagaina had gone away. Nag coiled himself down, coil by coil, round the bulge at the bottom of the water-jar, and Rikki-tikki stayed still as death.

A spring used to absorb shocks and vibrations is (a) Close-coil helical spring (b) Open coiled helical spring (c) Spiral spring (d) Leaf spring

Description : A spring used to absorb shocks and vibrations is (a) Close-coil helical spring (b) Open coiled helical spring (c) Spiral spring (d) Leaf spring

Last Answer : (d) Leaf spring

A spring used to absorb shocks and vibrations is (a) Close-coil helical spring (b) Open coiled helical spring (c) Spiral spring (d) Leaf spring

Description : A spring used to absorb shocks and vibrations is (a) Close-coil helical spring (b) Open coiled helical spring (c) Spiral spring (d) Leaf spring

Last Answer : d) Leaf spring

A close coiled helical spring is compressed. Its wire is subjected to A. Compression B. Tension C.Shear D. Torque

Description : A close coiled helical spring is compressed. Its wire is subjected to A. Compression B. Tension C.Shear D. Torque

Last Answer : B. Tension

If a DC motor runs faster than designed, with all other conditions being normal, the possible cause could be a/an ______________. A. shorted shunt field coil B. open armature coil C. reversed commutating pole D. overload

Description : If a DC motor runs faster than designed, with all other conditions being normal, the possible cause could be a/an ______________. A. shorted shunt field coil B. open armature coil C. reversed commutating pole D. overload

Last Answer : Answer: A

What is relationship between resistance and heat as electricity flows through a wire?

Description : What is relationship between resistance and heat as electricity flows through a wire?

Last Answer : Need answer

How is electricity passed through a wire?

Description : How is electricity passed through a wire?

Last Answer : A  wire contains  mobile  electrons  as  majority  charge  carriers  and  holes  as minority  charge carriers when  an emf  or   potential  diffrence is  provided , electrons  flow  in opposite  direction  with  holes(convection current  flow)

The speed at which the shaft runs so that the additional deflection from the axis of rotation of the shaft becomes infinite, is known as _________ * 1 point (A) Whirling speed (B) Rotational speed (C) Stabilizing speed (D) Reciprocating speed

Description : The speed at which the shaft runs so that the additional deflection from the axis of rotation of the shaft becomes infinite, is known as _________ * 1 point (A) Whirling speed (B) Rotational speed (C) Stabilizing speed (D) Reciprocating speed

Last Answer : (A) Whirling speed

The speed at which the shaft runs so that the additional deflection of the shaft from the axis of rotation becomes ___________, is known as critical or whirling speed. (A) zero (B) minimum (C) maximum (D) infinite

Description : The speed at which the shaft runs so that the additional deflection of the shaft from the axis of rotation becomes ___________, is known as critical or whirling speed. (A) zero (B) minimum (C) maximum (D) infinite

Last Answer : (D) infinite

The speed at which the shaft runs so that the additional deflection from the axis of rotation of the shaft becomes infinite, is known as _________ A. Whirling speed B. Rotational speed C. Stabilizing speed D. Reciprocating speed

Description : The speed at which the shaft runs so that the additional deflection from the axis of rotation of the shaft becomes infinite, is known as _________ A. Whirling speed B. Rotational speed C. Stabilizing speed D. Reciprocating speed

Last Answer : A. Whirling speed

It takes `16 min` to boil some water in an electric kettle. Due to some defect it becomes necessary to remove `10 %` turns of the heating coil of the

Description : It takes `16 min` to boil some water in an electric kettle. Due to some defect it becomes necessary to remove `10 %` turns of the heating coil of the

Last Answer : It takes `16 min` to boil some water in an electric kettle. Due to some defect it becomes necessary to remove `10 ... min C. `20.9` min D. `13.9` min

When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes? (1) Nine times (2) Three times (3) Six times (4) One-third

Description : When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes? (1) Nine times (2) Three times (3) Six times (4) One-third

Last Answer : (1) Nine times

When a uniform magnetic field B is applied to a current carrying coil, the coil will rotate in such a manner that its plane a) becomes parallel to B b) becomes anti-parallel to B c) makes an angle of 600 with B d) becomes perpendicular to B

Description : When a uniform magnetic field B is applied to a current carrying coil, the coil will rotate in such a manner that its plane a) becomes parallel to B b) becomes anti-parallel to B c) makes an angle of 600 with B d) becomes perpendicular to B

Last Answer : d) becomes perpendicular to B

When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes? (1) Nine times (2) Three times (3) Six times (4) One–third

Description : When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes? (1) Nine times (2) Three times (3) Six times (4) One–third

Last Answer : Nine times

How does electricity flow from one coil to another without connection ?

Description : How does electricity flow from one coil to another without connection ?

Last Answer : This is called mutual induction. That is, when electricity flows through the primary coil, a magnetic field or electromagnetic induction is created around it. And the secondary coil collects flux from ... on the number of punches used in secondary and primary. Which is called Transformation Ratio.

In a D.C. 3-wire distributor using balancers and having unequal loads on the two sides (a) both balancers run as generators (b) both balancers run as motors (c) balancer connected to lightly- loaded side runs as a motor (d) balancer connected to heavily- loaded side runs as a motor

Description : In a D.C. 3-wire distributor using balancers and having unequal loads on the two sides (a) both balancers run as generators (b) both balancers run as motors (c) balancer connected to lightly- loaded side runs as a motor (d) balancer connected to heavily- loaded side runs as a motor

Last Answer : (c) balancer connected to lightly- loaded side runs as a motor

What length of a wire of diameter 0.46 mm and specific resistance `50xx10^(-6) Omega`m would be required to make a coil of resistance `10 Omega` ?

Description : What length of a wire of diameter 0.46 mm and specific resistance `50xx10^(-6) Omega`m would be required to make a coil of resistance `10 Omega` ?

Last Answer : What length of a wire of diameter 0.46 mm and specific resistance `50xx10^(-6) Omega`m would be required to make a coil of resistance `10 Omega` ?

A long wire carries a steady curent . It is bent into a circle of one turn and the magnetic field at the centre of the coil is `B`. It is then bent in

Description : A long wire carries a steady curent . It is bent into a circle of one turn and the magnetic field at the centre of the coil is `B`. It is then bent in

Last Answer : A long wire carries a steady curent . It is bent into a circle of one turn and the magnetic field at the centre of ... ^(2)B` C. `2nB` D. `2n^(2)B`

When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is `B_(1)` If

Description : When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is `B_(1)` If

Last Answer : When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to ... 1)` C. `3B_(1)` D. `27B_(1)`

A wire of length 2 m carrying a current of 1 A is bend to form a circle. The magnetic moment of the coil is (in `A-m^(2)`)

Description : A wire of length 2 m carrying a current of 1 A is bend to form a circle. The magnetic moment of the coil is (in `A-m^(2)`)

Last Answer : A wire of length 2 m carrying a current of 1 A is bend to form a circle. The magnetic moment of the coil is (in `A ... . `pi//2` C. `pi//4` D. `1//pi`

Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potentail di

Description : Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potentail di

Last Answer : Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil ... the same? A. 3 B. 4 C. 6 D. 2

Current `i` is carried in a wire of length `L`. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field

Description : Current `i` is carried in a wire of length `L`. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field

Last Answer : Current `i` is carried in a wire of length `L`. If the wire is turned into a circular coil, the maximum magnitude ... iB)/(4pi)` D. `(L^(2)B)/(4pi)`

A length of wire carries a steady current. It is first bent to form a circular coil of one turn. The same length is now bent more sharply to give a lo

Description : A length of wire carries a steady current. It is first bent to form a circular coil of one turn. The same length is now bent more sharply to give a lo

Last Answer : A length of wire carries a steady current. It is first bent to form a circular coil of one turn. ... ots first value D. two times of its first value

A coil is wound with 400 feet of No. 16 tinned copper wire and connected to a 12 volt battery. What is the current if the resistance per 1000 feet of No. 16 tinned copper wire is 4.26 ohms? A. 4.8 amps B. 7.06 amps C. 10.65 amps D. 11.27 amps

Description : A coil is wound with 400 feet of No. 16 tinned copper wire and connected to a 12 volt battery. What is the current if the resistance per 1000 feet of No. 16 tinned copper wire is 4.26 ohms? A. 4.8 amps B. 7.06 amps C. 10.65 amps D. 11.27 amps

Last Answer : Answer: B

A coil is wound with 200 feet of No. 16 tinned copper wire and connected to a 12 volt battery. What is the current if the resistance per 1000 feet of No. 16 tinned copper wire is 4.26 ohms? A. 1.14 amps B. 7.04 amps C. 10.22 amps D. 14.08 amps

Description : A coil is wound with 200 feet of No. 16 tinned copper wire and connected to a 12 volt battery. What is the current if the resistance per 1000 feet of No. 16 tinned copper wire is 4.26 ohms? A. 1.14 amps B. 7.04 amps C. 10.22 amps D. 14.08 amps

Last Answer : Answer: D

The frequency of an alternator at a given RPM is determined by the _____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage

Description : The frequency of an alternator at a given RPM is determined by the _____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage

Last Answer : Answer: B

The frequency output of an operating alternator is controlled by the _____________. A. relative speed of the rotor poles B. number of turns of wire in the armature coil C. strength of the magnets used D. output voltage

Description : The frequency output of an operating alternator is controlled by the _____________. A. relative speed of the rotor poles B. number of turns of wire in the armature coil C. strength of the magnets used D. output voltage

Last Answer : Answer: A

One factor that determines the frequency of an alternator is the ____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage

Description : One factor that determines the frequency of an alternator is the ____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage

Last Answer : Answer: B

The secondary coil of a transformer in which the voltage is stepped down are usually made of thicker wire than primary. Why?

Description : The secondary coil of a transformer in which the voltage is stepped down are usually made of thicker wire than primary. Why?

Last Answer : The secondary coil is made of thicker wire to sustain larger electric current.

Can a static magnet induce an e.m.f in a stationary coil of wire? Give reasons.

Description : Can a static magnet induce an e.m.f in a stationary coil of wire? Give reasons.

Last Answer : No, when both coil and magnet are stationary, the magnetic field linked with the coil remains constant. Only when the magnetic field linked with the coil changes, current is produced.

Induced current in coil by a magnet turns it into an A. straight wire B. magnet C. ammeter D. electromagnet

Description : Induced current in coil by a magnet turns it into an A. straight wire B. magnet C. ammeter D. electromagnet

Last Answer : electromagnet

E.M.F for a coil depends upon A. the cross sectional area B. no. of turns of wire C. the magnitude of magnetic flux density D. all of above

Description : E.M.F for a coil depends upon A. the cross sectional area B. no. of turns of wire C. the magnitude of magnetic flux density D. all of above

Last Answer : all of above

The spring index (C) is (A) mean coil diameter / wire diameter (B) wire diameter / mean coil diameter (C) wire diameter x mean coil diameter (D) none of the above

Description : The spring index (C) is (A) mean coil diameter / wire diameter (B) wire diameter / mean coil diameter (C) wire diameter x mean coil diameter (D) none of the above

Last Answer : (A) mean coil diameter / wire diameter

The spring index is, (A) Ratio of wire diameter to mean coil diameter (B) Force per unit cross-sectional area of spring (C) Ratio of mean coil diameter to wire diameter (D) Force required to produce unit deflection

Description : The spring index is, (A) Ratio of wire diameter to mean coil diameter (B) Force per unit cross-sectional area of spring (C) Ratio of mean coil diameter to wire diameter (D) Force required to produce unit deflection

Last Answer : (C) Ratio of mean coil diameter to wire diameter

When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring (B) Wire diameter of each spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring

Description : When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring ... spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring

Last Answer : (D) Square of wire diameter of each spring

The maximum shear stress in spring wire is induced at (A) Inner surface of the coil (B) Outer surface of the coil (C) Central surface of the coil (D) End coils

Description : The maximum shear stress in spring wire is induced at (A) Inner surface of the coil (B) Outer surface of the coil (C) Central surface of the coil (D) End coils

Last Answer : (A) Inner surface of the coil

The stiffness of spring is, (A) Deflection per unit of axial force (B) Force per unit cross-sectional area of spring (C) Ratio of mean coil diameter to wire diameter (D) Force required to produce unit deflection

Description : The stiffness of spring is, (A) Deflection per unit of axial force (B) Force per unit cross-sectional area of spring (C) Ratio of mean coil diameter to wire diameter (D) Force required to produce unit deflection

Last Answer : (D) Force required to produce unit deflection

The spring index is the ratio of wire diameter to mean coil diameter. a) True b) False

Description : The spring index is the ratio of wire diameter to mean coil diameter. a) True b) False

Last Answer : a) True

Pick up the correct statement from the following: (A) A wire wound in spiral form, is called a helical spring (B) The pitch of a close coil spring, is very small (C) The angle made by the coil with horizontal, is called the angle of helix (D) All the above

Description : Pick up the correct statement from the following:  (A) A wire wound in spiral form, is called a helical spring  (B) The pitch of a close coil spring, is very small  (C) The angle made by the coil with horizontal, is called the angle of helix  (D) All the above

Last Answer : (D) All the above

Pick out the wrong statement. (A) The equivalent stiffness of two springs (of equal stiffness 'S') in series is S/2 while in parallel is 2S (B) For a helical spring, deflection is proportional to D3(D = mean coil diameter) or d4(d = wire diameter) (C) Crushing load or columns is less than the buckling load (D) Modulus of resilience is proportional to (stress at elastic limit)2

Description : Pick out the wrong statement. (A) The equivalent stiffness of two springs (of equal stiffness 'S') in series is S/2 while in parallel is 2S (B) For a helical spring, deflection is ... is less than the buckling load (D) Modulus of resilience is proportional to (stress at elastic limit)2

Last Answer : (C) Crushing load or columns is less than the buckling load

The capacity of a spring to store energy is called the spring form coefficient. Stiffness of a spring is measured by the (A) Ability to absorb shock (B) Capacity to store energy (C) Ratio of the wire & coil diameters (D) Load to produce unit deflection

Description : The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the (A) Ability to absorb shock (B) Capacity to store energy (C) Ratio of the wire & coil diameters (D) Load to produce unit deflection

Last Answer : Option D

A compression spring is made of music wire of 2 mm diameter having a shear strength and shear modulus of 800 Mpa and 80 Gpa respectively. The mean coil diameter is 20mm, free length is 40 mm, and the number of active coils is 10. If the mean coil diameter is reduced to 10 mm, the stiffness of the spring is approximately a. increased by 8 times b. decreased by 2 times c. increased by 2 times d. decreased by 8 times

Description : A compression spring is made of music wire of 2 mm diameter having a shear strength and shear modulus of 800 Mpa and 80 Gpa respectively. The mean coil diameter is 20mm, free length is 40 mm, and the number ... by 8 times b. decreased by 2 times c. increased by 2 times d. decreased by 8 times

Last Answer : a. increased by 8 times

The spring constant of a helical compression spring does not depend on a. Coil diameter b. Material strength c. Number of active turns d. wire diameter

Description : The spring constant of a helical compression spring does not depend on a. Coil diameter b. Material strength c. Number of active turns d. wire diameter

Last Answer : b. Material strength

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the...

Description : A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will: A. increase B. decrease C. remain constant D. be excessive

Last Answer : A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will: decrease

A nichrome wire used as heater coil has the resistance of 1 ohm/m. For ...

Description : A nichrome wire used as heater coil has the resistance of 1 ohm/m. For a heater of 1000 W at 200 V, the length of wire required will be 

Last Answer : A nichrome wire used as heater coil has the resistance of 1 ohm/m. For a heater of 1000 W at 200 V, the length of wire required will be 40 m.

Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to a very high temperature (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Description : Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to ... D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

Last Answer : (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation