8- If field resistance of a d.c. shunt generator is increased beyond its critical value, the generator output voltage will exceed its rated voltage
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- IDENTIFY TWO WAYS IN WHICH THE OUTPUT POLARITY OF A SHUNT DC GENERATOR CAN BE CHANGED.In DC shunt generator the type of current flows in field winding is AC whereas in armature winding it is DC. * True O False If the field winding of a DC shunt motor gets disconnected while in normal operation the speed will decrease to a tremendously low value and the motor may get stop. * True O False A DC series generator is considered suitable for general electric supply. * True FalseCalculate the flux per pole required on full-load for a 50 kW, 400 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1 2, the shunt field resistance is 200 2 and there is a brush contact voltage drop of 1 V at each brush on full- 5. load.
- Calculate the flux per pole required on full-load for a 50 kW, 400 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1N, the shunt field resistance is 200 N and there is a brush contact voltage drop of 1 V at each brush on full load. 3.State two ways by which the output polarity of a shunt DC generator can be changed.The armature of a shunt generator has 0.05 ohm effective resistance. Each brush has an effective resistance of 0.01 ohm.. The terminal voltage is 100 volts while the current is 40 amperes . What is the efficiency? Since the data of the field windings are not given, assume the generator is separately excited? TL -QE V
- A 4 pole , lap wound dc shunt generator has a useful flux per pole of 0.07 Wb. The armature winding consists of 220 turns each of 0.004ohms resistance. Calculate the terminal voltage when running at 900 rpm if the armature current is 50 A7 A 4-pole dc generator is running at 1500 rpm. The frequency of current in the armature winding is (a) 50 Hz (b) 150 Hz (c) 25 Hz (d) 100 Hz [ESE-2012]4. What for brushes are employed in DC generator? 5. What is the function of armature in a DC generator? 6. What is the function of commutator in a DC machine in generator action. 7 Whieh diffe u0ad in
- A 250-volt DC generator has an armature resistance of 0.10, shunt field resistance is 500, and series field winding is 0.1 0, the load current is 100A at 250V. what will be the induced voltage if machine connected in long shunt?An 8-pole dc generator has a duplex lap wound armature with 64 coils and 16 turns per coil. The resistance of this winding is 0.015 ohms per turn. Find the armature resistance.Q2) A 6 pole, wave wound DC shunt generator has a useful total flux of 420 mWb. The armature winding consists of 220 turns each of 0.004 Q resistance, when running at 900 RPM the armature current is 50 A. If the armature winding reconnected as lap calculate the terminal voltage in case of wave and lap given that the field circuit and the speed are kept same.