Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 39, Problem 12SQ
To determine
Choose the correct option to find the location of the armortisseur windings.
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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.
Q4/B/ What are the principal characteristics of a series DC motor? What are
its uses?
Core
Mc
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 above
Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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- Under load in DC machines, the armature current will cause: a. Compensating Windings O b. Increase in the main flux Oc Armature Reaction O d. Interpolesarrow_forwardthe basic requirement of DC armature winding is that it must be: a) a closed one b) a lap winding c) a wave winding d) either (b) or (c)arrow_forwardTwo separately excited dc generators are connected in parallel and supply a load of 200A. Generator A has an induced emf of 425V withn an armature resistance of 0.05 ohm. While Generator B has an induced emf of 440V with an armature resistance of 0.1 ohm. Neglecting the effect of the armature reaction, determine the output power shared by each machine.arrow_forward
- Subject- Rotating AC Machines. Explain in detail, Synchronous motor as a synchronous condenser.arrow_forwardi. Briefly describe the 5 major types of DC generators according to the manner in which their field flux is produced.arrow_forwardA 250 V DC shunt generator has a constant loss of 1250 W. Find the load current for maximum efficiency. Also find the value of maximum efficiency and output power times maximum efficiency. The armature resistance is 0.10.arrow_forward
- Two dc shunt generator in parallel supply together 2000A. The machines have armature resistances of 0.04 ohm and 0.025 0hm field resistance of 25 ohms and 20 ohms. The induced emf’s of 440 V and 420 V respectively. Find the output of each machine.arrow_forwardWhen the DC machine is running under saturation condition, then flux per pole decreases due to armature reaction. Select one: O True O Falsearrow_forwardA 4 pole DC shunt generator with 400 wave connected armature conductors running at 975 rpm supplies a load of 10 ohm resistance at terminal voltage of 220 volt. The armature resistance is 0.25 ohm and the field resistance is 110 ohm. Find the armature current, induced emf and the flux per pole.arrow_forward
- A four-pole de machine has an armature of radius 12.5 cm and an effective length of 25 cm. The poles cover 75% of the armature periphery. The arma- ture winding consists of 33 coils, each coil having seven turns. The coils are accommodated in 33 slots. The average flux density under each pole is 0.75T. If the armature is lap-wound, Determine the armature constant K,.arrow_forward1-The power output of the three phase machine is greater than the single phase machine. (TRUE/FALSE) 2-In thermocouple, when both the junctions are at the same temperature, the potential difference developed across both junction is zero. (TRUE/FALSE) 3-Due to decreased armature m.m.f., the armature reaction during load condition will increase and hence field flux will be distorted. (TRUE/FALSE) 4-While applying voltage in CRO, the grid is positive with respect to cathode. (TRUE/FALSE) 5-Losses in transformers are generally low and thus efficiency is high. (TRUE/FALSE)arrow_forward1) P.f of inductive load is corrected by connecting . . across it. .... ...... 2) Open circuit test measures . losses. 3) The output variables of a motor are and ........ ... .... 4) For a motor output power is given by ...... 5) Flux control, voltage control, and armature control are three methods for ....... of dc motor. 6) A transformer takes 100V at primary and gives 50V at secondary, its turn ratio equals 7) The given set of equations represents . . Ea – laRa = Vr , la = IL , %3D Rf 8) The given set of equations represents. la = !, + IL, VT Rf Ea – laRa = Vr , 9) The given set of equations represents . Ea – laRa – IseRse = Vr, la = Ise = l, %3D | 10). .. has more initial torque than shunt dc motor.arrow_forward
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