1 Answer

Answer :

Reluctance offered by the magnetic circuit depends upon nature of magnetic material, length of magnetic flux path, cross-sectional area of the material.

Related questions

Description : The opposition to the establishment of magnetic lines of force in a magnetic circuit is called the circuit's _______. A. resistance B. reluctance C. impedance D. inductance

Last Answer : Answer: B

Description : Define reluctance and permeance with respect to magnetic circuit.

Last Answer : Reluctance: The opposition offered by magnetic circuit to establish magnetic flux in it, is called as “Reluctance”.  Permeance: It is the reciprocal of reluctance and implies the magnetic core’s readiness with which magnetic flux is developed. 

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

Last Answer : (i) Magnetic flux density (B): It is the magnetic flux per unit area measured at right angles to the flux path. (Its unit is weber/m2 or tesla).  (ii) Reluctance: It is the ... flux to set up through it and it is reciprocal of reluctance. Permeance = 1/ Reluctance. Unit: weber/ampere.

Description : What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

Last Answer : What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

Description : The function of the commutator in a DC motor is to ________. A. reverse the flow of current through the armature B. reverse the flow of current in the field poles C. reduce the reluctance of the magnetic path through the motor D. shift the neutral running plane of the brushes to prevent sparking

Last Answer : Answer: A

Description : The resistance in a magnetic material is called as a) Capacitance b) Inductance c) Reluctance d) Magnetic resistance

Last Answer : c) Reluctance

Description : 68 The path of a magnetic flux in a transformer should have A. High resistance B. High reluctance C. Low resistance D. Low reluctance

Last Answer : D. Low reluctance

Description : 43 The purpose of providing an iron core in a transformer is to A.Provide support to windings B. Reduce hysteresis loss C. decrease the reluctance of the magnetic path D. reduce eddy current losses

Last Answer : C. Decrease the reluctance of the magnetic path

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

Description : The angular velocity depends upon the rate of change of the _______. (1) Angular Distance (2) Angular acceleration (3) Angular Displacement (4) torque

Last Answer : (3) Angular Displacement Explanation: The angular velocity is defined as the rate of change of angular displacement and is a vector quantity which specifies the angular speed of an object and the axis about which the object is rotating.

Description : The basic control action of a magnetic amplifier depends upon _____________. A. variations in the load capacitance B. changes in inductance C. type of core material D. construction of the core

Last Answer : Answer: B

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

Description : The induced emf in a coil depends upon: a. Strength of magnetic field b. Resistance of the coil c. area of the coil d. All of them

Last Answer : d. All of them

Description : The current flowing in a coil due to induced emf depends upon: a. shape of coil b. resistance of coil c. area of coil d. magnetic flux

Last Answer : a. shape of coil

Description : Compare variable reluctance and permanent magnet motors.

Last Answer : Variable reluctance Motor  Permanent magnet motors   The rotor is not magnetised The rotor is magnetised  High torque to inertia ratio  Low torque to inertia ratio  ... rotor has salient pole construction The rotor has mostly smooth cylindrical type of construction. 

Description : THE UNIT OF RELUCTANCE IS

Last Answer : The si unit of reluctance is Ampere-turn/weber

Description : Define : i) MMF ii) Reluctance iii) Fringing iv) Leakage flux

Last Answer : i) MMF:  It is the force that drives magnetic flux through magnetic circuit. It is measured in amp-turns.  ii) Reluctance (s) :-  Reluctance is the property of the substance ... through the magnetic circuit, leaks through the air surrounding the core. This flux is called as leakage flux.

Description : Define reluctance and give its unit.

Last Answer : Reluctance is the resistance offered the material to the passage of magnetic flux through it and corresponds to resistance in the electric circuit it is denoted by (s) And it's unit is amper per weber (A/Wb)

Description : Reciprocal of reluctance is?

Last Answer : Reciprocal of reluctance is permeance.

Description : Which of the following statements concerning AC circuits is correct? A. The power factor of a resistive circuit is always zero. B. True power in an inductive circuit always equals apparent power. ... . D. Total opposition to the flow of alternating current depends upon the amount of reactive power.

Last Answer : Answer: C

Description : The open circuit voltage of any storage cell depends wholly upon A. Its chemical constituents B. On the strength of its electrolyte C. Its temperature D. All of the above

Last Answer : D. All of the above

Description : The design of electromagnets is based upon which of the following fundamental equations ? (a) Force equation (b) Magnetic circuit equation (c) Heating equation (d) Voltage equation (e) All of the above

Last Answer : (e) All of the above

Description : The degree of protection by ground wire depends upon the a. Arcing angle b. Shielding angle c. Power factor d. All of above

Last Answer : The degree of protection by ground wire depends upon the a. Arcing angle b. Shielding angle c. Power factor d. All of above

Description : Voltage required to operate a neon-sign tube depends upon

Last Answer : Voltage required to operate a neon-sign tube depends upon length of the tube

Description : Frequency of oscillation of an AMV depends upon  1. RC values of the circuit 2. Collector load resistors 3. Transistor 4. Width of input pulse 

Last Answer : Frequency of oscillation of an AMV depends upon RC values of the circuit 

Description :  Hysteresis loss in a transformer depends upon: -  a) both voltage and frequency b) voltage alone c) frequency alone d) none of these

Last Answer :  Hysteresis loss in a transformer depends upon: - both voltage and frequency

Last Answer : The noise generated by a resistor depends upon its operating temperature.

Description : What is reluctance in electronics?

Last Answer : Need answer

Description : What is the verb of reluctance?

Last Answer : reluctant

Description : The voltage output of an AC generator is accurately controlled by _____________. A. changing the sensitivity of the prime mover to large changes in voltage B. varying the reluctance of the air gap C. varying the DC exciter voltage D. shorting out part of the armature windings

Last Answer : Answer: C

Description : What is reluctance? 

Last Answer : It is the property of a magnetic material, which opposes the establishment of magnetic flux in it, as in the case resistance in an electric circuit. 

Description : Calculate the reluctance of a material with length 2π x 10 -4 in air with area 0.5. a) 1 b) 10 c) 100 d) 1000

Last Answer : d) 1000

Description : Calculate the reluctance of the material with a mmf of 3.5 units and flux of 7units. a) 32.5 b) 10.5 c) 0.5 d) 2

Last Answer : b) 10.5

Description : The magnetism left in the iron after exciting field has been removed is known as (a) permeance (b) residual magnetism (c) susceptance (d) reluctance

Last Answer : (b) residual magnetism

Description : The range of wavelength values that a given photodiode will respond. ∙ A. spectral response ∙ B. permeance ∙ C. dark current ∙ D. reluctance

Last Answer : A. spectral response

Description : Which of the following methods may be adopted to reduce the effects of armature reaction ? (a) Increase in length of air gap at pole tips (b) Increasing reluctance of pole tips (c) Compensating windings (d) Interpoles (e) All of the above

Last Answer : (e) All of the above

Description : The slot leakage can be calculated by making which of the following assumptions ? (a) The current in the slot conductors is uniformly distributed over their cross-section (b) The leakage path is straight ... is only considered. The reluctance of iron paths is assumed as zero (d) All of the above

Last Answer : (d) All of the above

Description : Define (i) Permeability (ii) Reluctance.

Last Answer : Permeability: The capability of the magnetic material to conduct the magnetic flux is known as permeability (OR) It is defined as ratio of magnetic flux density B in a medium to the magnetic flux intensity ... as the property of a material due to which it opposes the creation of magnetic flux in it.

Description : A three-phase, three-stack, variable reluctance step motor has 20 poles on each rotor and stator stack. The step angle of this step motor is  (A) 3o (B) 6o (C) 9o (D) 18o

Last Answer : A three-phase, three-stack, variable reluctance step motor has 20 poles on each rotor and stator stack. The step angle of this step motor is  6o

Description : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

Last Answer : The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

Last Answer : In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.

Description : Reluctance motor

Last Answer : Reluctance motor Reluctance is opposition to magnetic flux. Reluctance is analogous to electric resistance. Reluctance motor does not have any winding on rotor. Rotor consists of  ... for rotation of rotor is generated through magnetic reluctance so it called reluctance motor.

Description : The total magnetic moment  1. is called saturation magnetization.  2. depends on the number of magnetic dipoles per unit volume, the instant electric current and the area of the current loop.  Which of the above statements is/are correct ?

Last Answer : depends on the number of magnetic dipoles per unit volume, the instant electric current and the area of the current loop

Description : The quality of democracy depends upon the degree of public participation. -SST 10th

Last Answer : 1. Democracy is a government of the people, by the people and for the people. The people' i.e. the public is, therefore, the most important player in the democratic sphere. ... about the activities of the government authorities and participate in the decision-making process at different levels.

Description : State the factors upon which the rate of Soil erosion depends. -SST 10th

Last Answer : The rate of Soil erosion depends upon: (i) Character of the slope of land. (ii) The density of vegetation. (iii) Rainfall—Heavy or Light.

Description : Angular separation between two colours of the spectrum depends upon which thing? -General Knowledge

Last Answer : The answer is 'Angle of deviation'

Description : Angular separation between two colours of the spectrum depends upon which thing? -General Knowledge

Last Answer : answer:

Description : Angular separation between two colours of the spectrum depends upon which thing? -General Knowledge

Last Answer : answer:

Description : Ionisation energy depends upon:

Last Answer : Ionisation energy depends upon: A. Principle qunatum number B. Azimuthal quantum number C. Magnetic quantum number D. (1) & (2) both

Description : Electronegativity of carbon atoms depends upon their state of hybridisation. In which of the following compounds, the carbon marked with asterisk is m

Last Answer : Electronegativity of carbon atoms depends upon their state of hybridisation. In which of the following compounds, the ... 2)-overset(**)CH_(2)-CH_(3)`