22 views
in Electrical Engineering by
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density: A. increases B. decreases C. remains the same D. doubles

1 Answer

0 votes
by

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density: decreases

Related questions

2 answers 31 views

What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled? A) It doubles B) It becomes 4 times C) It becomes 2π times D) It remains the same

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 41 views

The primary turns of a 444 V/222 V, 50 Hz single-phase transformer with a core cross-sectional area of 100 cm2, and a maximum flux density of 1.0 T is (A) 100 (B) 200 (C) 222 (D) 400

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
0 answers 14 views

A galvanised steel tower member has original length of 22cm and cross sectional area of 13 cm2. With working axial tensile load of 125 KN, the change in length was 0.2 mm. Calculate the percentage of elongation.  (A) 0.0712% (B) 0.00612% (C) 0.0909% (D) 0.19% 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

With the increase in the cross sectional area of the conductor, the value of resistance:  (1) Increase (2) Remain same (3) Decrease (4) None of these

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

Two aluminium conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 100 ohms the resistance of other conductor will be 

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
0 answers 20 views

Give the relation between magnetic field strength, magnetic flux density and permeability.

asked Aug 8, 2018 by Quiz
1 answer 21 views

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 18 views

The energy density of magnetic field in a magnetic circuit is (A) inversely proportional to magnetic flux density (B) directly proportional to the absolute permeability (C) directly proportional to the magnetic flux density (D) directly proportional to the square of magnetic flux density

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

Unit of flux density in magnetic circuits is ______________. A. Tesla B. dB C. Weber D. Hz 

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

At a particular temperature and current density, the critical magnetic field for a Type I superconductor is Bc and that for a type II superconductor ranges from Bc1 to Bc2 keeping other parameters unloaded. both superconductors are now subjected to a magnetic field B that satisfies the conditions B>Bc and Bc1 < ... will maintain a vortex state  (d) Type I superconductor will switch to the normal conducting state, while Type II superconductor will maintain a vortex sate

asked May 15, 2018 in Physics by Shimroz123
1 answer 20 views

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

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 34 views

Define the following terms: i) Magnetic flux density, ii) Reluctance, iii) Magneto-motive force, iv) Permeance.

asked Sep 4, 2018 by Shimroz123
0 answers 28 views

A dielectric material is said to be linear if the electric flux density varies (A) non-linearly with electric field (B) linearly with electric field (C) linearly with the permittivity (D) non-linearly with electric potential 

asked Jun 4, 2018 in Dielectrics by Shimroz123
1 answer 41 views

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 27 views

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 32 views

Define magnetic flux density and state its formula.

asked Aug 8, 2018 by Quiz
1 answer 21 views

In order to reduce cross sectional dimension, the wave guide to use is 

asked May 23, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its .......... is held constant.

asked Mar 26, 2018 in DC motor by Shimroz123
0 answers 35 views

What happens to the reluctance of a magnetic circuit, when an air gap is introduced to the core cross section ? (A) Decreases (B) Increases (C) Remain same (D) None of the above

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
2 answers 46 views
1 answer 10 views

A magnetic ring has a mean circumference of 20 cm and a cross-section of 20 cm2 and has 800 numbers of turns of wire. When the exciting current is 5 A, the flux is 2 mWb. The relative permeability of iron is nearly

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
1 answer 52 views

 The driving power from the prime-mover driving the alternator is lost but the alternator remains connected to the supply network; the field supply also remains on. The alternator will: A) get burnt B) behave as an induction motor but will rotate in the opposite direction C) behave as a synchronous motor and will rotate in the same direction D) behave as a synchronous motor but will rotate in a reverse direction to that corresponding to generator action 

asked Jun 4, 2018 in Alternator by Shimroz123
1 answer 10 views

Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 37 views

The path of the magnetic flux in a transformer has : (A) High reluctance (B) Low resistance (C) High conductivity (D) Low reluctance

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

The property of a material which opposes the creation of magnetic flux in it is known as?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 32 views

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
0 answers 142 views

The hysteresis loop of magnetic material has an area of 5 cm2 with the scales given as 1 cm=2AT and 1 cm=50 mWb, at 50 Hz, the total hysteresis loss is  (A) 15 W (B) 20 W (C) 25 W (D) 50 W 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

The magnetic field on the axis of a current carrying polygonal coil will have only a horizontal component parallel to the Plane of the coil 

asked May 24, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

According to Biot-Savart’s laws the magnetic field at a point due to incremental element of length dl carrying a current is  (A) Inversely proportional to the current carried by the element (B) Directly proportional to the current carried by the element (C) Directly proportional to the square of the distance (D) Inversely proportional to the length of the element

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 24 views

What is the energy stored in the magnetic field at a solenoid of 40 cm long and 4 cm diameter wound with 100 turns of wire carrying a current at 20A?  (A) 0.705 Joule (B) 0.789 Joule (C) 0.587 Joule (D) 0.658 Joule 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 90 views

 When The dc converter in figure shown has a resistance load of R = 10 Ω and the input voltage is Vs 220 V the converter switch remains on, its voltage drop is Vo -2 V. The chopping frequency is fI K sW Vs If the duty cycle is 50%, determine: (a) the average output voltage V (b) the RMS output voltage Vo (c) the converter efficiency (d) the effective input resistance of the converter

asked Apr 26 by Hussein
1 answer 98 views

When a conductor cuts magnetic flux, an emf is induced in the conductor. This is known as  (a) Joule's law (b) Faraday's law (c) Coulomb's law (d) Ampere’s law

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 43 views

Two parallel conductors are separated by a distance, d carrying a current, I in the same direction. The magnetic field along a line running parallel to the conductors and midway between them is (A) zero (B) proportional to I (C) proportional to d (D) proportional to the permeability of the medium. 

asked Jun 4, 2018 in Electrical Engineering by Shimroz123
0 answers 39 views

An amplifier which has almost same gain and input resistance of a CE amplifier but of higher bandwidth is  A) Cascode amplifier B) Cascade amplifier C) Darligton amplfier D) CC amplifier

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 14 views

Which of the following statements holds for the divergence of electric and magnetic flux densities?  A) Both are zero B) These are zero for static densities but non zero for time varying densities C) It is zero for electric flux density D) It is zero for magnetic flux density

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

The unit of magnetic flux is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

 Highest flux density exists inside which of the following instruments? A) Electrodynamic instruments B) Hot wire instruments C) Moving iron instruments D) Moving coil instruments

asked Jun 4, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 18 views

What is the permissible flux density in case of cold rolled grained oriented steel?

asked Mar 19, 2018 in Transformer by Shimroz123
0 answers 13 views

If the load current and flux of a DC motor are held constant, and voltage applied across its armature is increased by 10%, its speed will:  (A) Decrease by 10%. (B) Remain unchanged. (C) Increase by 10%. (D) Increase by 20%. 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

The induced voltage across a coil with 250 turns that is located in a magnetic field and is changing at a rate of 8 Wb/s is A. 1,000 V B. 2,000 V C.31.25 V D. 3,125 V

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
0 answers 11 views

When we move from the outermost track to the innermost track in a magnetic disk, then density (bits per linear inch)  (1) decreases (2) increases (3) remains the same (4) either remains constant or decreases

asked Apr 10, 2018 in Computer Engineering by Shimroz123
2 answers 49 views

 A DC Motor develops a torque of 150 N-m. A 10 percent reduction in the field flux causes a 50 percent increase in armature current. The new value of torque is: A) 102.5 N-m B) 202.5 N-m C) 172.5 N-m D) 232.5 N-m

asked Jun 4, 2018 in DC motor by Shimroz123

Welcome to electronics2electrical.com here you can ask questions related to electrical, electronics, mechanical, telecommunication, instrumentation, computer, mathematics, physics etc.
Be respectful to all the members. Do not copy and paste the answers from other websites which have copyright content. While asking question give full details about it.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase resistance factor synchronous load ac energy induction electric generator series frequency between speed capacitor use electrical meter line difference control type mosfet transmission magnetic plant high single instrument bjt unit source advantages function diode and machine winding field define torque parallel amplifier supply shunt thyristor motors electricity arduino maximum time relay armature problem value on transformers types coil diagram state flow ratio material three formula starting direction theorem method emf operating efficiency digital wave microprocessor test instruments inductance loss measure operation connected signal low applications effect single-phase network temperature working constant losses different law wattmeter measuring compare controlled breaker drive device logic rc full switch flux wire resistivity disadvantages free of materials machines angle force converter conductor transistor gain open protection scr core measurement number bridge principle generators reactance circuits negative the friction iron loop short pole battery conservation steam resistors hysteresis computer using analog lines secondary station gate a rectifier inverter linear induced relays nuclear capacitance basic characteristics design direct work rotor electronics ammeter forces diesel damping rlc connection factors capacitors minimum insulation moving regulation running self systems air fault range main stability quality starter igbt eddy alternator ideal rl average 3-phase plants arc thermal error fuzzy biasing dielectric pressure balanced superposition errors copper rotation feedback impedance measured electronic electrons charge inductive transfer explain start off back curve over solar is three-phase tariff locomotive peak bias zener engineering commutator surge conductors rating universal potentiometer density permanent mechanical transducer capacity memory adc excitation two fuse pure harmonics application semiconductor inductor internal pmmc reaction welding resonance traction permeability breakers rms designed electromagnetic si generation brushes switching capacitive shaded rate 1 distribution resistor methods delta star oscillator reluctance simplification algebra 8085 boolean weston dynamometer insulating strength installation definition fuel heating earth units

8,450 questions

7,047 answers

132 comments

3,084 users

...