Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 2, Problem 5SQ
To determine
Explain about the consequence when the heater element is not installed in a two-pole manual starter.
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Explain the characteristics and how the following motor starters work. 1.Slip Ring a. Variable Resistance b. Fixed Starting Resistance
c) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is
experiencing run-time error and unable to start, based on your understanding,
interpret the sequence of troubleshooting shall be carried out to identify the root
cause of the abnormalities.
3P
1P
MCB
MCB
STOP
K1
START
MOTOR
Figure 3 (c)
When a d-c motor is tested by the electrical input method, the field rheostat is adjusted to giveA. rated speed at full load.B. rated speed at no load.C. maximum speed at minimum load.D. minimum speed at maximum load.
Note: I have doubts if it is the letter A or the letter B, can you help me in this question, thanks.
Chapter 2 Solutions
Electric Motor Control
Ch. 2 - If the contacts on a manual starter cannot be...Ch. 2 - If the handle of an installed motor starter is in...Ch. 2 - How may an automatic operation be achieved when a...Ch. 2 - What does the term trip-free mean as it relates to...Ch. 2 - Prob. 5SQCh. 2 - Prob. 6SQCh. 2 - Prob. 7SQCh. 2 - Prob. 8SQCh. 2 - Select the best answer for each of the following....Ch. 2 - Select the best answer for each of the following....
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- What is meant by the low or poor starting economy of a primary resistor starter?arrow_forwardA 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W. (vii) What is the motor no-load speed if the no load induced voltage is 440.85V? 390 rpm 395 rpm 400 rpm 405 rpm 410 rpm (viii) What would be the starting line current if the motor was started at full-voltage? 4107 A 4255 A 4392 A 4400 A 4408 A (ix) What is the motor full-voltage starting line current if a 1.9Ω starting resistor is connected in series with the armature? 212 A 220 A 228 A 6 A 6 Aarrow_forwardQuestion 4 A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 m2 and a total field-circuit resistance of 55 2. Draw a schematic of the motor in the space below showing all known quantities (resistances, currents, voltages and load). Show only symbols for unknowns. Determine the following for rated operation What is the motor armature current? (a) 99 A (b) 102 A (c) 107 A (d) 110 A (e) 115 A (i) What is the CEMF developed in the armature? (a) 449.9 V (b) 440.0 V (c) 430.1 V (d) 429.3 V (e) 428.5 V (i) What is the total windings (copper) losses in the motor? (a) 4842.5 W (b) 4500.1 W (c) 3520 0 W (d) 1145 W (e) 980.1 Warrow_forward
- If the starter resistance is 1.9 ohms, what current does the motor take at the instant of starting in a shunt motor rated 25-hp. 230-volt, 600-rpm having armature and a field resistance of 0.275 ohm and 160 ohms, respectively. (Assume a 2-volt brush drop)arrow_forwardWhich one of the following is not a part of an induction motor? a. Starter b. Rotor c. Stator d. Terminal Box e. Frame/Yoke f. Bearing g. Shaftarrow_forwardWhat is the necessity of 3point starter? What is starter ?arrow_forward
- Determine the value of starting resistance of the 7.5 kW, 220 V shunt motor so thatthe current will not exceed 2 times of the motors full load rating. The armature andfield resistance is 0.24 and 101 ohms respectively. The motor efficiency is 95%arrow_forwardQ/ When a series dc motor is operated without a load, which of the following conditions occurs? * Ans 1- The armature draws excessive current 2- The armature speeds out of control 3- The armature will not turn 4-The voltage requirement increasesarrow_forward5. Which part (s) of the DC motor connect the power supply to the split- ring and coil? * O a) Carbon brushes O b) Magnets O c) Commutator d) Slip ringsarrow_forward
- (B)- Indicate whether the following statements are true or false and correct the false statements 1- Wave wound armature has two parallel paths. 2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is equal to 1/ turn ratio at full load 5.4. 3-When a series de motor is operated without a load, the armature draws excessive current Ph 4- The hysteresis loss can be minimized by using core of thin laminations ل لهول 259 Ne 02arrow_forwardA 60-hp 230-volt shunt motor has a shunt-field resistance of 38.3 ohms and an armature resistance of 0.04 ohm. If the resistance in the starter is 0.66 ohm, calculate the current input to the motor at the instant it is started (assume 3-volts brush drop)arrow_forwarda three phase star connected six pole induction motor has the following parameters R1=0.294 ohm,R2=0.144ohm,X1=0.503ohm,X2=0.209ohm Xm=13.25ohm a slip of the motor is 2%. the stator input impedence of the motor is?arrow_forward
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