The no-load terminal voltage of a separately excited DC generator is 220 V when the generator is driven at 1800 rpm. With the field current maintaining constant, the generator is loaded and delivers an output power of 50 kW at a terminal voltage of 215 V. Calculate the speed of the generator at this load. The armature winding resistance is 0.18 \Omega .
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- A 48kW, 600V, 1500 rpm separately excited dc motor is controlled by single phase semi-controlled converter. The resistance of the armature is 192 and of the field is 1450. The field circuit is controlled by a single phase fully controlled converter and its firing angle is set to 20. The AC supply voltage to the armature and field converters is a single phase 220V, 60 Hz. The voltage constant is 0.946 V/A rad/s. If the armature converter firing angle is 45 and the speed is 1200 rpm; calculate the armature current and the developed torque.L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) noA DC chopper is used in regenerative braking mode of a dc series motor. The dc supply is 600 V, the duty cycle is 70%. The average value of armature current is 100 A. It is continuous and ripple free. What is the value of power feedback to the supply ?
- I:01)A four-pole induction motor drives a load at 2500 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. If the dc-to-ac converter has a power efficiency of 88 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source.Q5- Adjust a fire angle for a three-phase full-wave semi-controlled converter to feed the separately exciter DC motor to get a load torque can be reached to 750 rpm. When the supply voltage of converter is 150 volts per-phase and the absorbed current through the armature 40A with resistance 0.2 a and a constant back emf 0.4v/rpm. Then find the maximum speed for motor assume the previous parameters values are a constant.
- What are the advantages and disadvantages of using Flyback and Push-Pull Converters in electrical power applications?The starting winding circuit of a capacitor start, induction run motor consists of a 15 Q resistance and a 20 Q2 inductive reactance. These components are in series with a 50 uF capacitor. The circuit is connected to a 120 V, 60 Hz source. Determine: a. the impedance of the series circuit. b. the current. c. the true power. d. the power factor.Needs Complete solution with 100 % accuracy.
- A 4-pole induction motor drives a load at 2500 rpm. This is to be accomplished by using an electronic converter to convert 400 Volts DC into a set of 3-phase AC voltages. Find the frequency required for the AC voltages assuming that the slip is 4 percent. The load requires 2 hp. If the DC-to-AC converter has a power efficiency of 88 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the DC source.Q3 Draw the equivalent circuit of a DC Motor, Separated Excited DC Motor and Compounded DC Motor. Label each component properly (a)A four-pole induction motor drives a load at 2405 rpm. This is to be accomplished by using an electronic converter to convert a 400V dc source into a set of three-phase ac voltages. a) Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2hp. b) If the dc-to-ac converter has a power efficiency of 93 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source.