Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 60, Problem 5SQ
Refer to the circuit shown in Figure 60–16. The motor will not start in either the forward or reverse direction when the start push buttons are pressed. Which of the following could not cause this problem?
- a. The F coil is open.
- b. The overload contact is open.
- c. The control transformer fuse is blown.
- d. The stop push button is not making a complete circuit.
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4.a. The device which responds to the heat developed within the motor is theA. shading coil.B. short-circuiter.C. bimetallic protector.D. current-operated relay.4.b. How is a rotating magnetic field produced during starting in a split-phase motor?A. A capacitor is inserted in the auxiliary-winding circuit.B. A low resistance coil is placed around a portion of each pole.C. Brushes are shifted off the hard-neutral position.D. An auxiliary winding is made with a high ratio of resistance to reactance.
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 -
1. Explain the working Principle of Single Phase Induction Motor.
2. What are the different types of Starters to control AC-Motor. Explain briefly.
3. Explain DOL starter of Single Phase Induction Motor briefly.
4. What is the purpose of the magnetic contactor?
5. What is the use of auxiliary contact in the magnetic controller?
6. What happens when the holding coil gets the supply in the magnetic controller?
7. Explain the working principle of a relay.
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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- Define or state the principle of operation, draw the wiring diagram, discuss the construction and application of each motor Split phase capacitor motor Repulsion motorarrow_forward5-Which of the following statements regarding single phase induction motors correct? (a) It requires only one winding. (c) It is self-starting. (b) It can rotate in one direction only. (d) It is not self-starting.arrow_forward14/ What are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a three-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I and II only b. I,II and III c. II and III d. I onlyarrow_forward
- 4. A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. The full load slip will be? a) 4% b) 5% c) 2.4% d) 3%arrow_forwardINCounter-Current Breaking of a 3-Phase Induction Motor (Reversing the Operation of a 3-Phase Induction Motor). Could you suggest any improvements to the control circuit?arrow_forward6.a. When you're taking a PM motor apart you should exercise special care not to damage theA. end bells.B. commutator.C. permanent magnets.D. brush holders.6.b. A PM field servo motor may be equipped with a resolver that is used toA. excite the armature windings.B. create a voltage that increases with velocity.C. prevent the brushes from sparking.D. feed back position information.arrow_forward
- A three phase star connected six pole induction motor has the following parameters R1=.294 R2=.144 X1=.504 X2=.209 Xm=13.25 the slip of the motor is 2% find stator input impedance of motorarrow_forwardWhat are the options suits for a slip ring induction motor? (A) Slip ring induction motor has high starting torque (B) Slip ring Induction motor has a complicated construction (C) Slip ring induction motor has high efficciency (D) Slip ring induction motor has more copper loss O a. (A) and (B) O b. (A), (B) and (C) O c. (A) and (C) O d. (A), (B) and (D)arrow_forward10 What type of supply is given to the stator of the three-phase induction motor? a. Three phase supply b. Two phase supply c. Four phase supply d. Single phase supplyarrow_forward
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