Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 11, Problem 6SQ
In Figure 11–10, assume that both motors are running. What would be the action of the circuit if the overload contact connected in series with coil 1M should open?
- a. Both motors will continue to run.
- b. Both motors will stop running.
- c. Pump motor 1 will continue to operate and pump motor 2 will stop running.
- d. Pump motor 1 will stop running and pump motor 2 will continue to operate.
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Multiple choices cont.:
c. The 3M load contacts are welded shut.
d. The normally open 3M contact between wire numbers 23 and 31 is hung closed.
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.
Answer all or else skip the question please
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- you are working as a plant electrician. you are told that a large DC motor was returned from the rewind shop and was installed on the previous shift. the motor seemed to operate properly until load was added, the motor then stopped, reversed direction, and began to run at a high speed. what is the probable cause of the trouble, and what would you do to correct the problem?arrow_forward1. 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_forwardExplain how does the current will be reduced during the starting of the motor.arrow_forward
- 10 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_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_forwardThe factors effecting the speed of dc motor are The flux p and the voltage across the armature the voltage across the armature and the applied voltage V The applied voltage V, flux p and the voltage across the armature none of the aboye Indicate whether the following statement are true or false * True False The distance between the beginnings of each cascaded two coils is called commutator Pitcharrow_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_forwardQ2: b- Explain how does the three- phase induction motor work? *arrow_forward3.) The time delay fuse using the strict standard rating for 2Ø, 230 V, 7.5 hp SCIM motor is A. 25 A B. 30 A C. 35 A D. Any of the abovearrow_forward
- i need the answer quicklyarrow_forward4.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.arrow_forwardA 400V, 60HZ, 6-pole wye connected , 30 induction motor draws 75KW with a line current of 100A. The core loss is 2KW, Friction and Windage loss is 1.2KW. The stator resistance between two terminals is 0.352. What is the efficiency if the motor runs at a slip of 2.5%?arrow_forward
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