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Home⇒ Engineering⇒
Magnetic circuit and electromagnetism
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The two conductors of a transmission
line carry equal current I in opposite
directions. The force on each conductor
is proportional to I2 [other wrong options] [Discuss in forum] proportional to I proportional to distance between the conductors inversely proportional to I2 |
Q22 ⇒ The force between two long parallel
conductors is inversely proportional to distance between the conductors [other wrong options] [Discuss in forum] radius af conductors current in one conductor product of current in two conductors |
Q23 ⇒ In the left hand rule, forefmger always
represents magnetic field [other wrong options] [Discuss in forum] voltage current direction of force on the conductor |
Q24 ⇒ Which of the following is not a unit of
flux? Telsa [other wrong options] [Discuss in forum] Maxwell Weber All of the above |
Q25 ⇒ A permeable substance is one through which the magnetic lines of force can pass very easily. [other wrong options] [Discuss in forum] which is a strong magnet which is a bad conductor none of the above. |
Q26 ⇒ Susceptibility is positive for ferroimagnetic substances [other wrong options] [Discuss in forum] non-magnetic substances diamagnetic substances none of the above |
Q27 ⇒ Remanent magnetism is one which is left in the iron piece after the removal of the magnetic field. [other wrong options] [Discuss in forum] is produced by the superconductor coils. is produced by electric current. is produced by induction. |
Q28 ⇒ The unit of flux is the same as that of pole strength [other wrong options] [Discuss in forum] reluctance resistance permeance |
Q29 ⇒ Which of the fo]lowing statements holds of the divergence of
electric and magnetic flux densities? It is zero for the magnetic flux density. [other wrong options] [Discuss in forum] Both are zero. These are zero for static densities but non-zero for time varying densities It is zero for the electric flux density. |
Q30 ⇒ The retentivity (a property) of material is useful for the construction of permanent magnets [other wrong options] [Discuss in forum] transformers non-magnetic substances electromagnets |
Q31 ⇒ An air gap is usually inserted in magnetic circuits so as to prevent saturation. [other wrong options] [Discuss in forum] increase in mmf. increase in flux. increase in inductance. |
Q32 ⇒ The magneto-motive force is the sum of all currents embraced by one line of magnetic field [other wrong options] [Discuss in forum] the voltage across the two ends of
exciting coil the flow of an electric current the passage of magnetic field through an exciting coil |
Q33 ⇒ Which of the following is correct? B = µ0 (H + M) [other wrong options] [Discuss in forum] B = µ0 H + M B = µ0 M + H B = M/µ0 |
Q34 ⇒ In a simple magnetic field the strength
of magnet flux is constant and has same value in energy part of the magnetic field [other wrong options] [Discuss in forum] increases continuously from initial
value to final value decreases continuously from initial value to final value first increases and then decreases till it becomes zero |
Q35 ⇒ When a single turn coil rotates in a uniform magnetic field, at a
uniform speed the induced emf will be alternating. [other wrong options] [Discuss in forum] steady. pulsating. none of these. |
Q36 ⇒ The attraction capacity of electromagnet
will increase if the flux density increases [other wrong options] [Discuss in forum] core length increases core area increases flux density decreases |
Q37 ⇒ Mutual inductance between two magnetically coupled coils depends on the all of the above [other wrong options] [Discuss in forum] permeability of the core material. number of turns of the coils. cross-sectional area of theircommon core. |
Q38 ⇒ The materials having low retentivity are suitable for making temporary magnets [other wrong options] [Discuss in forum] weak magnets permanent magnets none of the above |
Q39 ⇒ Two conducting thin coils X and Y (identical except for a thin cut
in coil Y) are placed in a uniform magnetic field which is decreasing
at a constant rate. If the plane of the coils is perpendicular to the
field lines, which of the following statement is correct? As a result,
ernf is inducted in both the coils. [other wrong options] [Discuss in forum] coil Y only. coil X only. none of the two coils |
Q40 ⇒ A material which is slightly repelled by
a magnetic field is known as diamagnetic material [other wrong options] [Discuss in forum] ferromagnetic material paramagnetic material conducting material |
Or |