11. A coil is wound with 50 turns and a current 8 A produces a flux of 200 µWb.
Calculate inductance of the coil ?
12. In the below circuit, X= ?
The above Gate is ‘AND’ Gate which is used for multiplication
X = A.B
13. _power plant is the plant which uses non conventional source of energy ?
Wind power is a Non-Conventional source of energy.
Type of non-convention source
(i) Wind energy
(ii) Solar energy
(iii) Tidal energy
(iv) Bio mass
(v) Geothermal Energy
Energy generated by using wind, solar, small hydro, tides, geothermal heat and biomass is known a non-conventional energy. All these sources are renewable process of energy generation and do not cause environmental pollution.
14. Relate 'Reluctance' with the following ?
Magnetic reluctance, or magnetic resistance, is a concept used in the analysis of magnetic circuits.
It is defined as the ratio of magnetomotive force (mmf) to magnetic flux.
It represents the opposition to magnetic flux, and depends on the geometry and composition of an object.
15. Power factor of an A.C. circuit is equal to A.C ?
The ratio between resistance and impedance in AC circuit is known as power factor cosφ= R / Z or, The ratio between active power and apparent power in volts – amperes is called power factor.
16. In electric traction, the coefficient of adhesion is represented by ?
Accordingly, the maximum longitudinal force between the wheel and rail at adhesive state is called adhesive force, and the ratio of adhesive force to vertical load between the wheel-rail is called adhesion coefficient.
The coefficient of adhesion μj is not constant, but varies with the composition of the rail and wheel treads and the condition of the rail surface (dry or wet, clean, oily, or frosty).
Values range from 0.30 for a clean, dry rail to 0.0–0.15 for a moist, greasy, or frosty rail surface.
17. In the circuit shown, if R = 0, then the phase angle between v(t) and i(t) is
?
if R = 0 than the circuit is purely inductive so for purely inductive the phase angle is 90° i.e. current lags voltage by 90°.
18. Two identical coils A and B of 1000 turns each lie in parallel plane such that
80% of the flux produced by one coil links with the other. If a current of 5A flowing
in A produces a flux of 0.05 mWb, then the flux, linking with coil B is ?
Flux in coil A = 0.05 mWb = 5×$10^-5$ Wb = A φ
No. of turn NA = NB= 1000
Flux linking with coil B = Flux linking to A x 80/100
= 0.8 × 5 × $10^-5$
= 4×10-5 wb = 0.04 mWb
19. In the circuit shown, find the equivalent resistance between A and B. ?
this is very simple so please try to solve .
20. The average value of a sinusoidal waves is ?
The average value of a whole sinusoidal waveform over one complete cycle is zero as the two halves cancel each other out, so the average value is taken over half a cycle. The average value of a sine wave of voltage or current is 0.637 times the peak value, (Vp or Ip.
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