Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 37, Problem 5SQ
To determine
Find the reason why the motor does not accelerate to fourth speed.
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For the Starting Up the Power Station Simulator
Why are certain operations blocked by isolators
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
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Figure 3 (c)
Q3/ Chose the correct answer for the following
1. Synchronous motors are generally not self-starting because
(a) the direction of rotation is not fixed
(b) the direction of instantaneous torque reverses after half cycle
(c) startes cannot be used on these machines
(d) starting winding is not provided on the machines
2. The power developed by a synchronous motor will be maximum when the load
angle is
(a) Zero
(b) 45°
(c) 90°
(d) 120°
3. An over-excited synchronous motor takes
(a) leading current
(b) lagging current
(c) both (a) and (b)
(d) none of the above
4. In a synchronous motor, the magnitude of stator back e.m.f. £& depends on
(a) d.c. excitation only
(b) speed of the motor
(c) load on the motor
(d) both the speed and rotor flux
5. A pony motor is basically a
(a) small induction motor (c) D.C. shunt motor
(b) D.C. series motor (d) double winding A.C./D.C. motor
Chapter 37 Solutions
Electric Motor Control
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- 3 Phase Induction motor I want a short answer please 11. The number of three-phase induction motor parts and the function of each part. 12. How to know the terminals of an induction motor if they are not encoded in the terminal box. 13. How can a three-phase induction motor be reversed? 14. Number of tools used to protect devices - transformers and induction motors - in the laboratory. 15. The number of devices required to conduct a test No load. for a three-phase induction motor 16. The number of devices required to conduct a test For a three-phase induction motor, a Blocked rotor 17. What is the use of a test? For a three-phase induction motor? Blocked rotor and No load 18. When conducting the no-load test, the current rises in the first second of preparation when using the direct connection method. the reasons for that? 19. When performing a non-pregnancy test, we notice a decrease in the ability factor. the reasons for that? 20. Connect an induction motor directly to the source.…arrow_forwardExplain how the following adjustments are made in a single phase induction type energy meter: (a) Lag adjustment (b) Adjustment for friction compensation (c) Creep (d) Overload compensation (e) Temperature compensationarrow_forward23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -arrow_forward
- A. The DC motor in Figure 3 on Worksheet 8 is aa) cumulatively connected short-shunt compound DC motor b) cumulatively connected long-shunt compound DC motor c) differentially connected short-shunt compound DC motor d) shunt DC motorB. Is the DC motor in Figure 1 on Worksheet 8 turning in the same direction as that in Figure 3?a) yes b) noarrow_forward1- What is the starting torque developed by a split-phase or a capacitor start motor? 2- What is the current in-rush at the time of starting the motor? Does it cause severe fluctuations on the line?arrow_forwardOne type of failure that's more common with 200 HP motors than with 10 HP motors is A. rotor bar failure.B. contactor failure.C. bearing failure. D. stator failures.arrow_forward
- If the field winding of a DC shunt motor gets disconnected while in normal operation the speed will decrease to a tremendously low value and the motor may get stop. * O True O Falsearrow_forwardQuestion No.26 The full load slip of 60 Hz, 12 pole squirrel cage induction motor is 5%. Its full load speed isarrow_forwardIf a centrifugal switch assembly in a split-phase or capacitor motor fails, you'll most likely have a A. slowly turning motor.B. loudly humming motor.C. motor turning at too high a speed. D. motor that has reversed direction while running.arrow_forward
- There are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for another 10 seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.(EKTS )arrow_forwardWhat is synchro? Explain how it is controlled with respect to control systemarrow_forwardQ6-Indicate whether the following statements are true or false and correct the false statements. 1- The as the LAICHa en 3- to mi uude 220 General questions 4- In series d-c generator the field winding will be constructed from high number of turns and high cross-sectional area of wire. 5-Series motor maintains a more constant speed under varying load 6-The armature voltage of d.c series generator is not affected by load current. 7- In series d-c generator the field winding will be constructed from high number of turns and high cross-sectional area of wire. 8- If field resistance of a d.c. shunt generator is increased beyond its critical value, the generator output voltage will exceed its rated voltage 9-The inter pole winding is connected in parallel to field winding. 10- in de machine the interpole winding connected across the armature winding.arrow_forward
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