Related Questions

An electromagnet is created--------electrical current through a coil of wire.
A by passing
B passes by
C to be passed
D passed
The core of an electromagnet is said to be in saturation when:
A the core is permitted to move freely within the coil
B an increase in current through the coil causes no further increase in the mmf
C frequent changes in the direction of current through the coil causes heating effects in the core material
D changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
E None of the above
Which one of the following principles best describes the basic operation of an electromagnet?
A Current is induced in a conductor that is moving through a magnetic field
B Like magnetic poles repel, while unlike poles attract
C Current flowing through a conductor generates a magnetic field
D Like magnetic poles attract, while unlike poles repel
E None of the above
Core of an electromagnet should have
A low coercivity
B high susceptibility
C both of the above
D none of the above
Electromagnet is constructed with which of the following ?
A Steel
B Soft Iron
C Aluminium
D Nickel
In what ratio must a mixture of 11% sugar strength be mixed with that of 25% sugar strength so as to get a new mixture of 13% sugar strength?
A 5:1
B 6:1
C 7:2
D 10:3
A man spends 75% of his income. his income is increased by 20% and he increased his expenditure by 10%. His savings are increased by :
A 10%
B 25%
C 37.50%
D 50%
A man spends 75% of his income. His income is increased by 20% and he increased his expenses by 10% . His saving are increased by
A 50%
B 37.50%
C 25%
D 10%
If the height of a right square pyramid is increased by 12%, by what percent must the side of the base be increased, so that the volume of the pyramid is increased by 28%?
A 3%
B 7%
C 10%
D 36%
Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the unpunched plate in
A Tension
B Compression
C Bearing
D Any one of the above

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