Related Questions

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
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
The coefficient of coupling between two air core coils depends on
A Self-inductance of two coils only
B Mutual inductance between two coils only
C Mutual inductance and self inductance of two coils
D None of the above
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°
The time communicate between Bangladesh and USA is the same as that to communicate between two adjacent houses mask used should be:
A Fiber optic
B Satellite
C Twisted pair
D Radio link
The field coils of D.C. generator are usually made of
A Mica
B Copper
C Cast iron
D Carbon
The electromagnetic coils on the neck of the picture tube or tubes which pull the electron beam from side to side and up and down are called a...?
A Transformer
B Yoke
C Capacitor
D Diode
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
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity and n = Number of active coils)
A $$\frac{{{\text{G}}{{\text{d}}^4}}}{{8{{\text{D}}^3}{\text{n}}}}$$
B $$\frac{{{\text{G}}{{\text{d}}^3}}}{{8{{\text{D}}^3}{\text{n}}}}$$
C $$\frac{{{\text{G}}{{\text{d}}^4}}}{{4{{\text{D}}^3}{\text{n}}}}$$
D $$\frac{{{\text{G}}{{\text{d}}^4}}}{{8{{\text{D}}^2}{\text{n}}}}$$
A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is
A $$\frac{{4{\text{W}}{{\text{D}}^2}{\text{n}}}}{{{{\text{d}}^4}{\text{N}}}}$$
B $$\frac{{4{{\text{W}}^2}{\text{Dn}}}}{{{{\text{d}}^4}{\text{N}}}}$$
C $$\frac{{4{{\text{W}}^2}{{\text{D}}^3}{\text{n}}}}{{{{\text{d}}^4}{\text{N}}}}$$
D $$\frac{{4{{\text{W}}^2}{{\text{D}}^3}{{\text{n}}^2}}}{{{{\text{d}}^4}{\text{N}}}}$$

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