Related Questions

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
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be
A Zero
B Small
C The same as rated voltage
D High
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
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
A rectangular plot measuring 90 meters by 50 meters is to be enclosed by wire fencing.If the poles of the fence are kept 5meteres apart,how many poles will be needed?
A 55
B 56
C 57
D 58
A farmer built a fence around around his square plot. He used 27 fence poles on each side of the square. How many poles did he need altogether?
A 100
B 104
C 108
D 120

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