The magnetization curve for a separately excited DC generator is shown in Figure Q4 (c). The generator is rated at 6 kW, 130 V, 50 A, and 1600 r/min. Its field circuit is rated at 5 A. The following data are known about the machine: (c) 160 150 140 VF = 130 V Rp = 20 N RA = 0.18 N 130 Radj = 0 to 40N Nf = 1000 turns per pole 120 T10 Answer the following questions about this generator, assuming no armature reaction. 100 90 (i) Determine the range of voltage adjustments that can be achieved by changing 80 Radj if this generator is operating at no load. 70 60 (ii) Analyze the maximum and minimum no-load voltages in the generator if the field rheostat is allowed to vary from 0 to 40 Q and the generator's speed is allowed 50 40 to vary from 1400 to 2000 r/min. 30 20 (iii) Analyse the field current that must be flowing in the generator if the armature current of the generator is 50 A, the speed of the generator is 1500 r/min, and the terminal voltage is 106 V. 10 ok 2 5 Shunt field current, A 1000 2000 3000 4000 5000 6000 7000 Field mmf. A turns Figure 4(c) Terminal and generated voltage, V

The actual rotor resistance referred to the stator in an induction motor is? O a. r2 O b. r2/(1-s) O c. r2/s O d. r2*(1-s)/s

In a DC generator, the iron losses at 1000 rpm are 10 kW at a given field current. At a speed of 750 rpm and at the same field current, the total iron losses become 6 kW. Assume the hysteresis loss is directly proportional to the speed and the eddy current loss is proportional to the square of the speed. Determine the iron losses at 500 rpm.

A 75.0 kW, 230-V shunt generator has a generated emf of 243.5 V. If the field current is 12.5 A at rated output, what is the armature resistance?

Armature reaction in an alternator primarily affects:   A: rotor speed  B: terminal voltage per phase  C: frequency of armature current  D: generated voltage per phase

The frequency of rotor current in an induction motor is       slip times the frequency of stator current.       slip times the frequency of supply,     One by slip times the frequency of stator current.       One by slip times the frequency of supply

A dc shunt generator delivers 50 kw at 250 v, its armature has a 4-pole wave winding with a resistance of 0.01 ohm and its field resistance is 125 ohm. if the number of turns in the armature is 201 and the flux per pole is 0.02 wb, find the voltage generated and the speed of operation. *

A4-Pole, duplex wave-wound de generator, has 144 slots with 2 coils per slot, each having two turns. If the flux per pole is is 20mWb and the armature rotates at 1500 rpm and the armature develops a power of 25kW, what will be the current in each path (in Amp)?

Please solve this problem step by step and illustrate your answer properly. Write your answer in a piece of paper please. Box the final answer.

A separately-excited DC generator has a magnetization curve shown in Figure 1. What is the internally-generated voltage Ea in volts if its prime mover speed is 1400 RPM and the current through the field circuit is 7 A? (answer in 2 decimal places) EAl ... 500 465 450 420 430 400 300 200 100 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 4.75 5.2 6.15 Field current, A (Note: At Ia = 0, E, = 3 V) Magnetization Curve at nm= 1800 rpm Add your answer Internal generated voltage, V