Related Questions

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
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
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 alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
A Chromium
B Nickel
C Vanadium
D Cobalt
Residual magnetism in steel for magnets is increased by the addition of
A Nickel
B Cobalt
C Tungsten
D Chromium
Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
A Chromium
B Nickel
C Tungsten
D Cobalt
A company owns some land and buildings for which the following details are relevant : Cost of land Taka 50,000; cost of building Taka 100,000, estimated life of building 20 years, estimated residual value of building Taka 2000; estimated residual value of land Taka 50,000. The company uses the straight line depreciation method. Which is the correct annual depreciation charge for this asset?
A Taka 4000
B Taka 4900
C Taka 7400
D Taka 7500
The e.m.f. generated by a shunt wound D.C. generator is E. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
A $$\frac{{\text{E}}}{2}$$
B 2E
C Slightly less than E
D E
The emf generated in a dc generator is directly proportional to
A Flux per pole
B No, of oples
C Spped of armature
D all above

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