Q1. Which of the following is not true of a DC machine commutator? (a) Its made of copper (b) Its also known as slip rings (c) Its also known as split rings (d) Its mounted on the rotor shaft (e) Its connected to the armature conductors Q2. Which of the following is true of a DC machine commutator? (a) The commutator provides external access to the armature via the brushes (b) The commutator segments are electrically insulated from each other and the rotor (c) The commutator acts as a mechanical rectifier in a DC generator (d) The commutator ensures that the current entering the armature of a DC motor is of the correct polarity (e) All of the above The main reason why Copper is preferred over Aluminum for DC machines windings is because: Q3. (a) Copper is less expensive than Aluminum (b) Copper is a better conductor than Aluminum (c) Copper is lighter than Aluminum (d) Copper has a higher melting point than Aluminum. (e) All of the above.

Q1. Which of the following is not true of a DC machine commutator? (a) Its made of copper (b) Its also known as slip rings (c) Its also known as split rings (d) Its mounted on the rotor shaft (e) Its connected to the armature conductors Q2. Which of the following is true of a DC machine commutator? (a) The commutator provides external access to the armature via the brushes (b) The commutator segments are electrically insulated from each other and the rotor (c) The commutator acts as a mechanical rectifier in a DC generator (d) The commutator ensures that the current entering the armature of a DC motor is of the correct polarity (e) All of the above The main reason why Copper is preferred over Aluminum for DC machines windings is because: Q3. (a) Copper is less expensive than Aluminum (b) Copper is a better conductor than Aluminum (c) Copper is lighter than Aluminum (d) Copper has a higher melting point than Aluminum. (e) All of the above.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 3RQ

See similar textbooks

Similar questions

Q choose the correct answer: 1-Brushless excitation system consisting of.... a- Stator field winding and power diodes b-stator and rotor field winding and capacitor c- stator and rotor field winding and capacitor d- Everything mentioned in the options 2- Voltage generated per phase in an alternator is proportional to a- Flux per pole b- Number of turns in armature c-Winding factors d- Everything mentioned in the options e- Frequency of waveform 3- If input mech. Power of SG constant, the functionality of AVR is a- Control flux of rotor b-Control terminal voltage c- Control flux and terminal voltage d-Control Load angle
Explain the following armature winding terminologies (i)commutator Pitch (ii)Coil Side (iii)Pole Pitch
Please help fast .. I giving upvote
An 8-pole, 600 rpm dc shunt with 778 wave connected armature conductors of 12.5 ohms resistance at a terminal voltage of 250 volts. The armature resistance is 0.25 ohm the shunt field resistance is 250 ohms. Determine the flux per pole? (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)
What is the name of the part of the DC machine that is made up of copper? O a. Armature winding O b. Magnetic Poles O c. Commutator O d. Brush
Q2) A wave wound DC generator armature has six - pole and 50 slots. Each slot contains 20 conductors. The required generated voltage is 250 V. a) What would be the speed of the armature, if flux per pole is 0.007 Wb? b) If the armature is rewound as lap formation and run at the same speed you found in part a) above, what will be the generated voltage? The flux per pole is 0.007 Wb.
SOLVE AND SHOW YPUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DE CIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. a) determine the frequency of the machine when running at 3600 rpm.
Answer by step by step procedure Make sure to illustrate the problem Box the final answer
Identify the DC Generator used for Arc Welding purpose. With a neat sketch explain its working. List it's advantages and disadvantages.
For 6 polar D.C machine armature has 36 number of slots and the type of winding is a double layer simplex lap winding. a. How many coils are present? b. What is the coil span in terms of number of slots? c. If each coil has 4 turns, then what is the total number of armature conductors presents? d. How many parallel paths will be their in the armature? e. Altogether how many brushes will be their?
SOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. f.) Determine the total generated voltage if the armature is moving at a velocity of 10m / s
SOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. d) determine the total force tending to rotate the armature core in lbs, if the winding is simplex lap connected.