A step-down transformer is used on a 2.2 kV line to deliv...
A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?
20
250
200
500
Correct answer is D
Ep = 2.2kV = 2200V; Es=110V; Ns=25; Np=?
=\(\frac{E_p}{E_s}\) = \(\frac{N_p}{N_s}\)
= \(\frac{2200}{110}\) = \(\frac{N_p}{25}\)
=110 × Np = 2200 × 25
=\(N_p\) = \(\frac{55,000}{110}\)
∴\(N_p\) = 500 turns
The wire of a platinum resistance thermometer has d resistance of 3.5\(\Omega\) at 0 °C and...
Calculate the inductance L, of the coil in the circuit diagram shown above ...
An electric device is rated 2000 W, 250 v. The correct fuse rating of the device is?...
If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of...
A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew...