Related Questions

Air-core coils are practically free from
A Hysteresis losses
B Eddy current losses
C Both A and B
D None of the above
Mutually inductance between two magnetically coupled coils depends on
A Permeability of the core
B The number of their turns
C Cross-sectional area of their common core
D All of the above
In an RC coupling scheme, the coupling capacitor CC must be large enough ___________
A To pass d.c. between the stages
B Not to attenuate the low frequencies
C To dissipate high power
D None of the above
In RC coupling, the value of coupling capacitor is about ___________
A 100 pF
B 0.1 µF
C 0.01 µF
D 10 µF
The most costly coupling is ___________ coupling
A RC
B Direct
C Impedance
D Transformer
The distance between the starts of two consecutive coils measured in terms of coil sides is called
A front pitch
B winding pitch
C commutator pitch
D back pitch
In a single phase power factor meter the phase difference between the currents in the two pressure coils is
A exactly 0°
B approximately 0°
C exactly 90°
D approximately 90°
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
Spacers are provided between adjacent coils
A to provide free passage to the cooling oil
B to insulate the coils from each other
C both (A) and (B)
D none of the above
The two pressure coils of a single phase power factor meter have
A The same dimensions and the same number of turns
B The same dimension but different number of turns
C The same number of turns but different dimensions
D None of the above

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