A DC generator with 8 pole, duplex lap winding excited with a flux of 3mWb/ pole. The number of parallel path in the winding is A 12 B 8 C D 16 4
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A: Given data, Voltage equation, vt=140cosωt+500 V Current equation, it=30cosωt+150 A
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- A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of aboveQ4) a)discuss the equivalent circuit and slip in a single-phase motor. b)discuss the core - losses (Rc).5. Two shunt generators A and B operate in parallel and their load characteristics may be taken as straight lines. The voltage of A falls from 240 V at no-load to 220 V at 200 A, while that of B falls from 245 V at no-load to 220 V at 150 A. Determine the current which each machine supplies to a common load of 300 A and the bus-bar voltage at this load.
- The resistance of the field winding(copper wire) of a DC machine is 0.25 ohm at 25°C. When operating at full-load, the temperature of the winding is 75 °C. The temperature coefficient of resistance of copper is 0.00427 per °C at 0°C. Find the resistance of the field winding at full-load.Which of the following sensors has a permanent magnet inside? Hall effect sensor thru-beam optical sensor piezo-electric sensor LVDT capacitive proximity sensor |o|0|0|6Q4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core Mc
- Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.Two DC generators, each with armature resistance of 0.02 ohm and fieldresistance of 50 ohms run in parallel and supply a total current of 1000 amperesto the load circuit. If their emfs are 270 V and 265 V, their bus bar voltagewill be. [Ans. 267.5 V]A single phase full wave AC voltage controller has a resistive load of 5 ohms and an input voltage of Vs = 220 V (RMS), 50 Hz. The delay angles of both thyristors are set to 90 degrees. The maximum power that can be delivered to the load is: Select one: a. 5.65 kW b. 9.68 kW c. 11.52 kW d. None of these
- Two shunt generators A and B operates in parallel and their load characteristicsmay be taken us straight lines. The voltage of the generator A falls from 240 V atno-load to 220 V at 200 A while that of B falls from 245 V at no load to 220 V at150 A. Determine the current which each machine supplies to a common load of300 A and the bus-bar voltage at this load.help me in these questions pls write the questions with the and by (Computer) 1-Which of the following statements INCORRECTLY explain the label in the figure about LVDT working principles? a. Secondary coils are connected in series in such a way that their output is opposing each other. b. Constant DC voltage input to primary coil. c. Displacement moves ferrous rod from central position. d. The difference of the output voltage between the two secondary voltage.==========2- Explain the working principle of the measurement system in the figure below.i. Force input that is supplied to the sensor is processed to give the response in the form of raw output signal.ii. Signal conditioner manipulated the weak signal to give a conditioned input.iii. Analog or digital indicator display the unit that gives output reading of quantity being measured.iv. Measured value is compared with the input value for further action. a. ii, iii and iv only. b. i, ii and iv only. c. i, ii and…Self-Lift P/O Luo- Dc-dc Converter i need explain Drive for seperately excited dc motor