EE-II-REVISION 1

Tungsten steel, cobalt steel and chromium steel are examples for ----------

• PERMANENT MAGNET

• TEMPORARY MAGNET

• ELECTRO MAGNET

Which material is used for Electro magnet?

• Soft metal

• Hard metal

• BOTH A and B

Which of the following is not property of a magnet

• Opposite poles attract each other

• Like poles ripple each other

• Magnet will always stand on east west side

• Magnet will always stand on north south side

what is the SI unit of magnetic flux ?

• Ampere

• weber

• volt

what is the unit of the magnetic flux?

• ampere-turns per meter

• ampere

• weber

Example for self inductance device

• Resistor

• Capacitor

• Choke

What is the SI unit of mutual inductance?

• Ohm

• Henry

• Volt

If the current in one coil becomes steady, the current in neighbouring coil is _______

• Infinity

• Zero

• Double

• One

If a transformer reduces voltage, it is called a....................... transformer.

• step left

• step right

• step up

• step down

Why transformers work with A.C. current but not D.C.

• A.C current produces changing magnetic field.

• D.C current produces changing magnetic field.

• D.C current is weak

• A.C current is powerful