Question

A transformer has a primary-to-secondary turns ratio of 100:1. The voltage on the primary side is 27.7 kv.a.c. at 60.0 Hz ( assume 60.0 Hz when treating electric power topics). A load is connected across the secondary winding. Assume that the transformer is ideal.

(a) Suppose that the electric utility supplied 27.7 kv.d.c. rather than 27.7 kv.a.c. How much power would the transformer’s secondary winding deliver to the load in this case?

(b). The transformer’s primary winding is supplied by a pair of wires from the electric utility. Show that, with the 2.00-ohm load connected across the secondary winding, the primary winding appears to the utility as it were a 20.0-kilohm resistor.

(c). Briefly explain why, if the 2.00-ohm load is removed from the secondary, leaving an open circuit, the primary—though indeed connected to the utility—appears to the utility as it were an open circuit.

(d). Referring to part h, express the voltage across and current entering the transformer’s primary winding in the time domain in the short-circuit case. That is, write expressions for v(t) and i(t). It is recommended to work in phasors and then to change to the time domain at the end of your work, but don’t forget to adjust for rms.

Answer #1

2(a). A transformer has a primary-to-secondary turns ratio of
100:1. The voltage on the primary side is 27.7 kv.a.c. at 60.0 Hz (
assume 60.0 Hz when treating electric power topics). A load is
connected across the secondary winding. Assuming that the
transformer is ideal, what voltage is developed to the load?
Briefly show your work. Sketch a diagram.
2(b). The load of part a is a 2.00-ohm load. How much current
does the load draw from the transformer’s secondary...

An ideal transformer has 150 turns on the primary winding and
600 turns on the secondary. If the primary is connected across a
110V generator, what is the output at the secondary?
A: 110V
B: 220V
C: 440V
D: 880V
Please show work

A 2.2 KVA, 440---220 V, 60 Hz, step-down transformer has the
following parameters: Rp= 3.0 Ω, Xp= 4.0 Ω, Rs= 2.5 Ω, Xs= 2.0 Ω,
Rc= 60 KΩ, and Xm = 15 KΩ. The transformer is operating at full
load with a power factor of 0.707 lagging. The magnetizing branch
impedance can be ignored.
a) Draw the transformer’s equivalent T-circuit,
b) Find the equivalent winding impedance referred to the high
side,
c) Calculate the primary and secondary currents,
d) Determine...

The primary coil of a transformer has N1 = 340 turns, and the
secondary coil has N2 = 2 190 turns. If the input voltage across
the primary coil is Δv(t) = 170 cos ωt, where Δv is in volts and t
is in seconds, what rms voltage is developed across the secondary
coil?

current transformer with a bar primary has 250 turns
in it secondary winding. the resistance and reactance of the
secondary circuit are 1.4 ohms and 1.1 ohms respectively including
the transformer winding. when 5A current flows in the secondary
winding, the magnetism mmf is 80 AT and iron lost is 1.1w.
determine the following (i) ratio error (ii) phase angle error

A transformer has 1600 turns on its secondary and 200 turns on its
primary. The primary is connected to a 20V ac source. What is the
output voltage of the secondary in volts?

A step-up transformer has a primary coil with 100 loops and a
secondary coil with 800 loops. If the primary coil is supplied with
a household current of 120V and 12 A,
(a) what voltage is produced in the secondary circuit?
? V
(b) what current flows in the secondary circuit?
? A

. The turns ratio of a transformer used in a Bridge Rectifier is
12:1. The primary is connected to the power mains: 220V, 50Hz.
Assuming the diode voltage drops to be zero, (a) calculate the D.C
voltage across the load resistor. (b) What is the PIV of the diode?
If the same dc voltage is obtained by using Center tapped FWR, what
is PIV?

The turns ratio of a transformer used in a Bridge Rectifier is
2:1. The primary is connected to the power mains: 210V, 50Hz.
Assuming the diode voltage drops to be zero, (a) calculate the DC
voltage across the load resistor. (b) What is the PIV of the diode?
If the same dc voltage is obtained by using Center tapped FWR, what
is PIV?
WITH ALL STEPS

An ideal transformer has 100 turns on its primary coil and 200
turns on its secondary coil. If 120 V at 2.0 A is applied to the
primary,
(a) What voltage is present in the secondary?
(b) What current is present in the secondary?
(c) What is the output power?
(d) Is this a step-up or step-down transformer?
(e) Is the input power the same, larger or smaller than the
output power?

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