Magnetostatics Objectives Part 04
61 . In order to minimize loss due to hysteresis, the magnetic material should have low hysteresis coefficient
62 . Gilbert is the unit of magnetomotive force
63 . Reciprocal of permeability is reluctivity
64 . One watt is not the same as 980 dynes
55 . A ferro-magnetic core subjected to cycles of magnetization will exhibit hysteresis when the cycle is Alternating, rotating and pulsating.
56 . The electromagnetic force or torque developed in any physical system tends to decrease the reluctance
67 . The mmf of magnetic circuit is analogous to which quantity of electric circuit emf
68 . The relative permeability of is less than unity in case of diamagnetic materials
69 . The core of a transformer for microwave frequency should be made of ferrites
70 . Hysteresis loss least depends on ambient temperature
71 . Which coil will have least inductance A coil in which current of 10mA increasing at the rate of 2amp/sec represents a power flow of 60microWatt
72 . Which of the following is the unit of magnetic flux density Tesla
73 . A crack in the magnetic path of an inductor will result in reduced inductance
74 . The Z-axis carries filamentary current of 10piA along az. Which of these is incorrect H=-a at (5, 3pi/2, 0)
75 . The circuit elements which will oppose the change in circuit current are Inductance
76 . The law that the induced emf and current always oppose the cause producing them is due to Lenz
77 . Which of the following is the unit of inductance milli-Henry
78 . A ferrite core has less eddy current loss than an iron core because ferrites have high resistance
79 . The magnetism left in the iron after exciting field has been removed is known as permeability.
80 . Diagram Question—
