Answered: Draw the electrical characteristics and…

Engineering

Electrical Engineering

Draw the electrical characteristics and mechanical characteristics of d.c differential compound motor

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter5: Resistors

Section: Chapter Questions

Problem 1PA

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

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(B)- Draw the electrical characteristics and mechanical characteristics of d.c differential
compound motor

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GENERAL INSTRUCTIONS: SOLVE EACH OF THE FOLLOWING PROBLEMS AND SHOW YOUR SOLUTIONS FOR EACH ITEM. 1. A long-shunt compound generator supplies 50 kW at 230 V. the total field- and armature circuit resistances are 46 ohms and 0.03 ohms , respectively. The brush-contact drop is 2 V. Determine the percent voltage regulation. Neglect the armature reaction.
A 120 V shunt generator running at 850 rpm has its armature and shunt field resistance of 0.15 ohm and 50 ohm respectively. It supplies 200 lamps each rated at 60 W, 100 V. The friction and windage and core loss of the machine is 400 W. its armature copper * loss on full load and shunt field loss is 2156.7 W, 240 W 2232.6 W, 240 W O 2232.6 W, 200 W 2156.7 W, 200 W O
A 4-pole, d.c. shunt motor has a flux per pole of 0.04 Wb and the armature is lap-wound with 720 conductors. The shunt field resistance is 240 Q and the armature resistance is 0.2 S. Brush contact drop is 1V per brush. Determine the speed of the machine when running (a) as a motor taking 60 A and (b) as a generator supplying 120 A. The terminal voltage in each case is 480 V.
G1. The terminals of a DC motor are identified as the same as those of a DC generator. a) true b) false G2. What are the standard identification letters for the armature winding of a DC compound motor? a) A1 and A2 b) S1 and S2 C) F1 and F2 d) none of the above G3. What are the standard identification letters for the series field winding of a DC compound motor: a) A1 and A2 b) 1I and S2 c) F1 and F2 d) none of the above
Help me solve this one
2. A 4 pole dc shunt motor has a flux per pole of 0.04 Wb and the armature is lap wound with 720 conductors. The shunt field resistance is 240 ohms and the armature resistance is 0.2 ohm. Brush contact drop is 1V per brush .Determine the speed of the machine when running as a motor taking 60 A and as a generator supplying 120A.The terminal voltage is 480V in each case.
1.4 A dc shunt generator when driven without connecting field winding shows an open circuit terminal voltage of 12 V. When field winding is connected and excited, the terminal voltage drops to zero because (a) field resistance is higher than critical resistance (b) there is no residual magnetism in the field circuit (c) field winding has got wrongly connected (d) there is a fault in armature circuit
M1. Which of the following is the preferred method of changing the direction of rotation of a DC compound motor? a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b M2. If the resistance of a DC motor's shunt-field circuit is increased, what happens to the speed of the motor? a) it speed decreases b) it stays the same c) it speed increases d) none of the above M3. What is a common method of controlling the speed of a DC shunt motor? a) by adding rheostat in series with the armature b) by adding rheostat in series with the shunt field c) could be either "a" and "b" d) neither "a" nor "b"
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Calculate armature current for A d.c. shunt generator has shunt field winding resistance of 100 Q Hi supplying a load of 5 kW at a voltage of 250 V. Ish Righ 0.000 4 GR LOAD I