Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 32, Problem 3SQ
What will happen if terminals T5 and T6 in Figure 32–3 are interchanged on high speed?
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Answer by true or false
True
False
- As the load
is increased
gradually, the
load current
increases but
the terminal
voltage
decreases
due to the
increase in
voltage drop
of armature
circuit
Chapter 32 Solutions
Electric Motor Control
Ch. 32 - Prob. 1SQCh. 32 - Prob. 2SQCh. 32 - What will happen if terminals T5 and T6 in Figure...Ch. 32 - Is the motor operating at high speed or low speed...Ch. 32 - Describe the operation of the line diagram in...Ch. 32 - Describe the operation of Figure 325 (B) by adding...Ch. 32 - In Figure 327, the motor cannot be started in high...Ch. 32 - Prob. 8SQ
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- TUTORIAL PROBLEMS 2. A long shunt compound ganerator has full losd output of 100 kW st 250 volts. The armature, series and shunt windings bave rmistances of 0-05 ,0-03 0 and 55 respectively. Find the Brmature current and L A 4 oele shunt gmerstor with wave-wound armature has 41 alots, nch having 12 conductors. Th muture resistance is 0-05 and shunt field resistance is 200 . The flux per poie in 25 mWh. Ifa lond ce of 10 is connected soros the armabure ferminals, calculate the voltage scross the lond w mrior is driven at 1000 rp.m 389-5 V pmented emf 464-5 A, 282-3 Varrow_forwardIn a certain sub-station, there are 5 d.c. shunt generators in parallel, ench having an armature resistance of 0.1 0, running at the same speed and excited to give equal inducnd emfs Each generator supplies an equal share of a total load of 250 kW at a terminal voltage of 500 V into a load of fixed resistance. If the field current of one generator is raised by 4%, the others remaining unchanged, calculate the power output of each machine and their terminal voltages under these conditions Assume that the speeds remain constant and flux is proportional to field currentarrow_forwardQ3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.arrow_forward
- What is load regulation?arrow_forward3- How can the speed effect. on the N.L chara. And the external chara. Of the shunt generator?arrow_forwardAnswer by true or false * True False - The critical speed in a DC shunt generator is the speed of the DC generator at which shunt field resistance is represents the critical field resistance.arrow_forward
- In DC generator, the induced emf in armature is directly proportional toarrow_forwardTrue False The critical speed in a DC shunt generator is the speed of the DC generator at which shunt field resistance is represents the critical field resistancearrow_forwardQ1) Answer the following: - 1-E = (V – laRa ) then N = 2-The consist of and N 3-In a the shunt field winding is connected in parallel with the armature winding only. Series Field Shunt Field R Re 4- The Vo is adjusted by adding This increase slope of this line causing the operating point to shift at lower voltage. No Load V prime mover certain speed. 5-for wave wound generator A= , and for lap wound generator A= 6-The is made up of insulated 7- The connection arrangement to obtain shunt or series excited generators, the field winding is disconnected from the machine and connected across an external supply. is as shown in the figure below. For UC No Supply Load field winding constant speed wwwarrow_forward
- DC Shunt Generator No-Load Characteristics Please draw the curves for both cases and mention the scale for each on a graph paper. Please use graph paper only.arrow_forwardShunt generator will build up its voltage when: Olts field resistance higher than critical value. Olts field resistance is less than critical value.arrow_forwardin the speed equation N=Va-Ia.Ra/K.flux what does term "K" specify?arrow_forward
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