PHP CONTROL STRUCTURES (LOOP) QUIZ

What is the mmf of a wire with 8 turns carrying three amperes of current?

240 AT

0.24 AT

2.4 AT

24 AT

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Degaussing is the process of

Demagnetising metallic parts

Removal of magnetic impurities

Removing gases from the materials

Remagnetising metallic parts

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The change of cross-sectional area of conductor in magnetic field will affect

resistance of conductor

None of these

both of the listed here

reluctance of conductor

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The induced voltage across a stationary conductor in a stationary magnetic field is

decreased

increased

reversed in polarity

zero

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Which of the following is the unit of magnetic flux density?

Lumens

Tesla

None of the listed here

Weber

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For a given wire-wound core, an increase in current through the coil

Decreases the flux density

Increases the flux density

Causes no change in flux density

Reverses the flux lines

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A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

180

360

270

90

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Fleming's left hand rule is used to find

Direction of force on a current carrying conductor in a magnetic field

Direction of flux in a solenoid

Direction of magnetic field due to current carrying conductor

Polarity of a magnetic pole

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For which of the following materials the saturation value is the highest?

Paramagnetic materials

Diamagnetic materials

Ferromagnetic materials

Ferrites

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The unit for reluctance is

Wb

At/m

tesla

At/Wb

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