Related Questions

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
In a battery cover is placed over the element and sealed to the top of the battery container. This is done
A to reduce evaporation of water from electrolyte
B to exclude dirt and foreign matter from the electrolyte
C to discharge both of the above functions
D to discharge none of the above functions
The battery is an electrochemical device, which means battery
A Makes chemicals by mechanical means
B Uses chemical action to provide electricity
C Has curved plates instead of flat plates
D Does not use an electrolyte
If a bar magnet is __, the two pieces form two complete magnets, each with north and south pole.
A broken
B broke
C breaking
D break
What is the gigantic magnet in space?
A Stars
B Blue hole
C Black hole
D all
Magnetism of a magnet can be destroyed by
A heating
B hammering
C by inductive action of another magnet
D by all above methods
The north pole of a magnet is the one:
A that has its molecules arranged in a random pattern
B that would be attracted to the earth's north magnetic pole
C that would be repelled by the south pole of another magnet
D that would be attracted to the earth's south magnetic pole
E None of the above
The permanent magnet field system of brushless dc servo- motor is generally on
A Stator
B Rotor
C Partly on stator and partly on rotor
D Either (a) or (b)
Which dc servomotor requires strongest permanent magnet?
A Slotted armature
B Surface wound armature
C Surface wound with stationary rotor
D Either A or B

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