Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 60, Problem 8SQ
To determine
Choose the option that represents the cause for the problem that exists in the motor.
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Students have asked these similar questions
If 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.
Q5. Describe the following to protect and control the motors:
(i)
Using circuit diagram and the current-time characteristics, explain the motor overload
protection by thermal overload relay.
Explain using a circuit diagram how the motor will automatic shutdown when input
(ii)
fails?
(iii)
Explain using circuit diagram the under voltage protection of a motor
(iv)
Draw the circuit diagram to explain the adjustable-frequency drive for a 3-phase
induction motor
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)
Chapter 60 Solutions
Electric Motor Control
Ch. 60 - What are the three main electrical test...Ch. 60 - What is the advantage of a plunger-type voltage...Ch. 60 - A motor is tripping out on overload. The motor...Ch. 60 - A motor is tripping out on overload. The motor...Ch. 60 - Refer to the circuit shown in Figure 6016. The...Ch. 60 - Refer to the circuit shown in Figure 6016. Assume...Ch. 60 - Prob. 7SQCh. 60 - Prob. 8SQCh. 60 - Refer to the circuit shown in Figure 6016. If a...Ch. 60 - Prob. 10SQ
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- 23. 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(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_forward25.a. There are two wires labeled P1 and P2 at a DC motor's junction box. These wires will attach to whatinternal component of the motor?A. A speed potentiometerB. The parallel windingC. GroundD. A thermostat25.b. As you walk up to a machine, you see a technician tapping on the back section of a DC motor with alead mallet. This technician isA. cleaning the commutator.B. checking for end bell cracks.C. looking for weak or worn brushes.D. reseating the rear end bell on the case.arrow_forward
- 20.a. A capacitive sensor is used to detect the presence of _______ objects.A. ferrousB. nonmovingC. nonconductiveD. magnetic20.b. A three-phase motor can be made to run backwards byA. connecting a resistor in series with the armature.B. reversing the control voltage connections.C. reversing three of its power leads.D. reversing two of its power leads.arrow_forwardDefine or state the principle of operation, draw the wiring diagram, discuss the construction and application of each motor Split phase capacitor motor Repulsion motorarrow_forwardDescribe how pressure switches are connected to start and stop (a) small motors and (b) large motors.arrow_forward
- 1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forwardIf 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_forwardWhat is the purpose of the N/O contact in parallel with the start button in the magnetic start control circuit ..arrow_forward
- 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. motorarrow_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_forwardRefer to the circuit shown in Figure 105. Assume that the motor is running and an overload occurs, which causes the OL contact to open and disconnect coil M to stop the motor. What effect does the opening of the overload contact have on the pressure switch circuit?arrow_forward
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