Description : Flux density formula
Last Answer : Flux density formula
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 : Give the relation between magnetic field strength, magnetic flux density and permeability.
Description : Define magnetic flux density and state its formula.
Last Answer : The magnetic flux per unit area is called as magnetic flux density. Magnetic flux density is denoted by B. The formula for magnetic flux density is Weber per metre square or Tesla. Mathematically ... the unit of magnetic flux density is Weber per metre square which is also called as Tesla.
Description : 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
Last Answer : In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth
Last Answer : If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by Blv.
Description : What is the permissible flux density in case of cold rolled grained oriented steel?
Last Answer : The permissible flux density in case of cold rolled grained oriented steel is 1.7 Wb/m2.
Description : Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these
Last Answer : Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these
Description : The unit of magnetic flux is?
Last Answer : The unit of magnetic flux is weber.
Description : Describe the concept of leakage flux, useful flux and fringing with neat diagram.
Last Answer : Leakage Flux
Description : Define useful flux, leakage flux and fringing.
Description : Explain the leakage flux and its effect with the help of neat diagram.
Description : The property of a material which opposes the creation of magnetic flux in it is known as?
Last Answer : The property of a material which opposes the creation of magnetic flux in it is known as reluctance.
Description : In lead acid battery the density of acid indicates the (1) charge of the battery (2) level of acid (3) e.m.f of the battery (4) damage of the plates
Last Answer : In lead acid battery the density of acid indicates the charge of the battery
Description : Define the following terms and state their units: (i) Luminous intensity, (ii) Luminous flux
Last Answer : i) Luminous intensity: This is defined as the luminous flux emitted into a solid angle of space in a specific direction. Its unit is the candela. OR The luminous flux per unit solid angle ( ... energy radiated by the light source in all direction. The unit of luminous flux is lumen (lm)
Description : 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
Last Answer : 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 synchronous generator
Description : 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.
Last Answer : It is possible to increase the field flux and, at the same time, increase the speed of a d.c. motor provided its armature current is held constant.
Last Answer : Interpole flux should be sufficient to neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil.
Description : The path of magnetic flux in a transformer should have?
Last Answer : The path of magnetic flux in a transformer should have low reluctance.
Description : An energy signal has G(f) = 20. Its energy density spectrum is A) 20 B) 100 C) 400 D) 800
Last Answer : 400
Description : Define resistivity. State its unit.
Last Answer : Resistivity can be defined as the resistance of a conducting material per unit length with unit area of cross section. Its unit is ohm/meter
Description : What is the smallest unit of a compound with the same chemical characteristics?
Last Answer : The molecule is the smallest unit of a compound with the same chemical characteristics.
Description : THE UNIT OF RELUCTANCE IS
Last Answer : The si unit of reluctance is Ampere-turn/weber
Description : Write the purpose of coal and ash handling unit. Also write different activities that arc carried out in this unit.
Last Answer : Purpose of coal and ash handling unit :- To transport coal from coal storage to power plant. A large quantity of ash about 10 to 30 % produced in furnace, the removal of ash from boiler furnace ... disposed off. Various methods of disposal of ash: Mechanical system. Pneumatic system.
Description : Define admittance and state its unit.
Last Answer : Admittance is defined as the ability of the circuit to carry (admit) alternating current through it. OR It is the reciprocal of impedance Z. i.e Admittance Y = 1/Z. Unit: Its unit is siemen (S) or mho (Ʊ).
Description : What is the SI unit of conductivity ?
Last Answer : The SI unit of conductivity Siemens/m.
Description : Which unit holds data permanently? (A) Input unit (B) Secondary storage unit (C) Output Unit (D) Primary Memory Unit
Last Answer : Which unit holds data permanently? (A) Input unit (B) Secondary storage unit (C) Output Unit (D) Primary Memory Unit
Description : The unit heat rate characteristic of a thermal power unit shows : (A) Heat input per kWh of output versus the megawatt output of unit (B) Heat input per kW of output versus the megawatt output ... hour output of unit (D) Heat input per kW of output versus the megawatt hour output of unit
Last Answer : The unit heat rate characteristic of a thermal power unit shows : Heat input per kWh of output versus the megawatt output of unit
Description : Which of the following is the SI unit for admittance? A) Ohm B) Henry C) Farad D) Siemens
Last Answer : Which of the following is the SI unit for admittance? A) Ohm B) Henry C) Farad D) Siemens
Description : Which of the following is an example of SI derived unit? A) Capacitance (Farad) B) Time (second) C) Luminous intensity (Candela) D) All the above
Last Answer : Which of the following is an example of SI derived unit? A) Capacitance (Farad) B) Time (second) C) Luminous intensity (Candela) D) All the above
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 unit of reluctance is?
Description : The unit of retentivity is?
Last Answer : The unit of retentivity is weber/sq. m.
Description : What is the unit of reactance?
Last Answer : Unit of reactance is Ohms ( Ω ) .Reactance is denoted by X .
Description : Joule X second is the unit of?
Last Answer : Joule X second is the unit of power .
Last Answer : Unit of power is Watt denoted by capital W .
Last Answer : Unit of voltage is volt denoted by capital V .
Last Answer : Unit of resistance is Ohm.
Last Answer : Unit of work is Joule denoted by capital J .