Related InterviewSolutions

• Electromagnetic force and/or torque developed in any physical system, acts in such a direction as to tend to ____________(a) increase both the field energy and co-energy at constant current(b) increase the field energy and decrease the co-energy at constant current(c) decrease both the field energy and co-energy at constant current(d) decrease the field energy and increase the co-energy at constant currentThis question was addressed to me in quiz.The question is from Singly Excited Magnetic Systems topic in portion Magnetic Circuits of Electrical Machines
• The electromagnetic torque developed in any physical system, and with magnetic saturation neglected, acts insuch a direction as to tend to ____________(a) decrease both the reluctance and inductance(b) increase both the reluctance and inductance(c) decrease the reluctance and increase the inductance(d) increase the reluctance and decrease the inductanceThis question was addressed to me in a job interview.This key question is from Singly Excited Magnetic Systems topic in section Magnetic Circuits of Electrical Machines
• Consider a magnetic relay with linear magnetization curve in both of its open and closed position. What happens to the electrical energy input to the relay, when the armature moves slowly from open position to closed position?(a) Welec=Wfld(b) Welec=Wmech(c) Welec=Wmech/2+Wfld/2(d) Welec=0This question was addressed to me in semester exam.Query is from Singly Excited Magnetic Systems in chapter Magnetic Circuits of Electrical Machines
• The electromagnetic force developed in any physical system acts in such a direction as to tend to _____________(a) decrease the co-energy at constant mmf(b) increase the co-energy at constant flux(c) decrease the co-energy at constant flux(d) increase the co-energy at constant mmfI have been asked this question at a job interview.This key question is from Singly Excited Magnetic Systems in portion Magnetic Circuits of Electrical Machines
• The electromagnetic force and/or torque, developed in any physical system, acts in such a direction as to tend to ____________(a) decrease the magnetic stored energy at constant mmf(b) decrease the magnetic stored energy at constant flux(c) increase the magnetic stored energy at constant flux(d) increase the magnetic stored energy at constant currentThis question was posed to me in unit test.This intriguing question originated from Singly Excited Magnetic Systems topic in section Magnetic Circuits of Electrical Machines
• For a linear electromagnetic circuit, which of the following statement is true?(a) Field energy is less than the Co-energy(b) Field energy is equal to the Co-energy(c) Field energy is greater than the Co-energy(d) Co-energy is zeroThis question was addressed to me by my college professor while I was bunking the class.Question is taken from Singly Excited Magnetic Systems topic in chapter Magnetic Circuits of Electrical Machines
• When a current of 5A flows through a coil of linear magnetic circuit, it has flux linkages of 2.4 wb-turns. What is the energy stored in the magnetic field of this coil in Joules?(a) 6(b) 12(c) 1.2(d) 2.4The question was asked in an internship interview.Question is from Singly Excited Magnetic Systems topic in section Magnetic Circuits of Electrical Machines
• Magnetic stored energy density for iron is given by ______(a) 1/2 B/μ(b) 1/2 B^2 μ(c) 1/2 ∅^2 Rl(d) 1/2 B^2/μI have been asked this question in homework.This intriguing question comes from Singly Excited Magnetic Systems in portion Magnetic Circuits of Electrical Machines
• The energy stored in a magnetic field is given by ____________ where L=self-inductance and Rl=reluctance.(a) 1/2 Li^2(b) 1/2 (mmf*Rl)^2(c) 1/2∅Rl(d) 1/2 φ^2iThis question was addressed to me at a job interview.Asked question is from Singly Excited Magnetic Systems in portion Magnetic Circuits of Electrical Machines
• For a toroid to extract the energy from the supply system, the flux linkages of the magnetic field must be ________(a) zero(b) changing or varying(c) constant(d) any of the mentionedI had been asked this question at a job interview.My question comes from Singly Excited Magnetic Systems topic in portion Magnetic Circuits of Electrical Machines