Related Questions

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
An electromagnet is created--------electrical current through a coil of wire.
A by passing
B passes by
C to be passed
D passed
Strength of an electromagnet can be increased by
A increasing the cross-sectional area
B increasing the number of turns
C increasing current supply
D all above methods
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
Electromagnet is constructed with which of the following ?
A Steel
B Soft Iron
C Aluminium
D Nickel
A ferrite core has less eddy current loss than an iron core because
A Ferrites have high resistance
B Ferrites are magnetic
C Ferrites have low permeability
D Ferrites have high hysteresis
'While I stand on the roadway or one the Pavement gray, I hear in the deep heart's core'. From which poem these lines have been taken.
A From September 1. 1939
B The Lake Isle of Innis free
C The Charge of the Light Bridge
D Dreams
In which mode Windows starts with only the core drivers & services ?
A Normal Mode
B Safe Mode
C Quick Mode
D Repair Mode
Which one of the following is the core property of Object Oriented Programming ?
A Encapsulation, polymorphism
B Encapsulation, inheritance
C Polymorphism, overloading
D Encapsulation, polymorrphism, and inheritance
which of these is not a core data type?
A Lists
B Dictionary
C Class
D Tuples

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