b) A single-phase transformer with 10: 1 turns-ratio and rated at 50 kVA, 2400-V/240-V, 50-Hz is used to step down the voltage of a distribution system. The low tension (LT) voltage is to be kept constant at 240 V. Find the value of the load impedance of the LT side so that the transformer is loaded fully. Find also the value of the maximum flux inside the core if the LT side has 23 turns.

Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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Chapter1: Introduction
Section: Chapter Questions
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b) A single-phase transformer with 10: 1 turns-ratio and rated at 50 kVA, 2400-V/240-V, 50-Hz is used to
step down the voltage of a distribution system, The low tension (LT) voltage is to be kept constant at 240
V. Find the value of the load impedance of the LT side so that the transformer is loaded fully. Find also
the value of the maximum flux inside the core if the LT side has 23 turns.
(c) A 2-pole, 3-phase induction motor delivers 37 hp at the shaft at a speed of 2850 rpm on 500 V, 50 Hz supply.
The mechanical losses are 3.5 hp and the power factor of operation is 0.85. Calculate
(i) slip
(ii) rotor copper loss
(iii) total power input if the stator losses are 2500 Watts
| (iv) efficiency
(v) line current
(d) The armature and field resistances of a 300 V, de shunt motor are 0.6 2 and 260 2 respectively. When driving
a load of constant torque at 600 rpm, the armature current is 25 A. If it is required to increase the speed from 600
rpm to 750 rpm, calculate the resistance to be connected in the shunt field circuit.
Transcribed Image Text:b) A single-phase transformer with 10: 1 turns-ratio and rated at 50 kVA, 2400-V/240-V, 50-Hz is used to step down the voltage of a distribution system, The low tension (LT) voltage is to be kept constant at 240 V. Find the value of the load impedance of the LT side so that the transformer is loaded fully. Find also the value of the maximum flux inside the core if the LT side has 23 turns. (c) A 2-pole, 3-phase induction motor delivers 37 hp at the shaft at a speed of 2850 rpm on 500 V, 50 Hz supply. The mechanical losses are 3.5 hp and the power factor of operation is 0.85. Calculate (i) slip (ii) rotor copper loss (iii) total power input if the stator losses are 2500 Watts | (iv) efficiency (v) line current (d) The armature and field resistances of a 300 V, de shunt motor are 0.6 2 and 260 2 respectively. When driving a load of constant torque at 600 rpm, the armature current is 25 A. If it is required to increase the speed from 600 rpm to 750 rpm, calculate the resistance to be connected in the shunt field circuit.
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