Related Questions

Our skin, when exposed to excess sunlight, becomes dark. This is because of our skin pigments called
A flavoxanthin
B melanin
C carotene
D Xanthophyll
Color of the skin depends on
A Number of blood vessels in the dermis
B Color of the blood flowing through blood vessels
C Number of melanocytes
D Carotene
E Nutrition
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
A Arc
B Resistance
C Low frequency induction
D High frequency induction
Owing to skin effect
A Current flows through the half cross-section of the conductor
B Portion of the conductor near the surface carries more current and core of the conductor carries less current
C Portion of the conductor near the surface carries less current and core of the conductor carries more current
D Any of the above
The skin effect of a conductor will reduce as the
A Resistivity of conductor material increases
B Permeability of conductor material increases
C Diameter increases
D Frequency increases
Skin effect is proportional to
A $${\left( {{\text{conductor diameter}}} \right)^{\frac{1}{2}}}$$
B (conductor diameter)4
C (conductor diameter)2
D (conductor diameter)3
E none of the above
Skin effect occurs when a conductor carries current at _________ frequencies.
A Very low
B Low
C Medium
D High
লাইনে ফ্রিকুয়েন্সি বাড়লে 'Skin effect' কি হয়?
A বৃদ্ধি পায় 
B হ্রাস পায়
C অপরিবর্তিত থাকে
D কোনোটিই নয়
On which of the following factors the number of phases for which a rectifier should be designed depends?
A The voltage regulation of the rectifier should be low
B In the output circuit there should be no harmonics
C The power factor of the system should be high
D All of the above
The value of exciting or magnetizing current depends upon which of the following factors ?
A Total m.m.f. required
B The number of turns in the exciting winding
C The way in which the winding is distributed
D All of the above

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