Related Questions

A. some towns in Bangladesh are polluted B. All polluted towns should be destroyed C. Town Dhaka should be destroyed D. Town Dhaka is polluted E. Some towns in Bangladesh should be destroyed
A BDE
B BAE
C ADE
D CDB
Each question consists of five statements following by options consisting of three statements put together in a specific order. Choose the option which indicates a valid argument, that is, where the third statement is a conclusion drawn from the preceding two statements. A.Some towns in Bangladesh are polluted .B.All polluted towns should be destroyed.C.Town Dhaka should be destroyed.D.Town Dhaka is polluted.E.Some towns in Bangladesh should be destroyed
A BDE
B BAE
C ADE
D CDB
Which one of the following phrases best describes residual magnetism?
A Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B The force of attraction between the poles of a permanent and temporary magnetic field
C The amount of magnetic flux that is not confined to the core material of an electromagnet
D The circular magnetic field that surrounds a conductor carrying a current
E None of the above
Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?
A Series generator
B Shunt generator
C Compound generator
D None of the above
Following D.C. generator will be in a position to build up without any residual magnetism in the poles
A Series generator
B Shunt generator
C Compound generator
D Self-excited generator
In D.C. machines the residual magnetism is of the order of
A 2 to 3 percent
B 10 to 15 percent
C 20 to 25 percent
D 50 to 75 percent
The magnetism left in the iron after exciting field has been removed is known as
A permeance
B residual magnetism
C susceptance
D reluctance
Materials subjected to rapid reversal of magnetism should have
A large area oiB-H loop
B high permeability and low hysteresis loss
C high co-ercivity and high retentivity
D high co-ercivity and low density
Indicate which of the following material does not retain magnetism permanently.
A Soft iron
B Stainless steel
C Hardened steel
D None of the above
The commonly used material for shielding or screening magnetism is
A copper
B aluminium
C soft iron
D brass

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