4 What determines the power rating of a ma-chine?-5 If we cover up the vents in a motor, its out-put power must be reduced. Explain.-6 If a motor operates in a cold environment,may we load it above its rated power? Why?

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Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter10: Contactors, Relays, And Overloads

Section: Chapter Questions

Problem 32RQ

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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)
The following information is given for a 300kW, 600V, long shunt compound DC generat or, shunt field resistance is 75 ohms, armature resistance 0.01, brush resistance is 0.011 ohrms, series field resistance is 0.012 ohms and the divert or resistance of 0.036 ohms.When the machine is delivering full load; a. Draw the circuit diagrarn b. Calculate the voltage and C Power generated by the armat ure.
L1. It common practice to provide access to the interpole windings on machines designed to be used as motors or generators. a) is b) is not c) neither "a" nor "b" L2. The direction of rotation of a DC motor is referenced from the commutator end of the motor. a) true b) false L3. How may the direction of rotation of a DC motor be reversed? a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b"
The intermediate between mechanical energy and electrical energy in electrical machines is... a) A DC battery b) Responsible for energy flow from the rotor to the stator in case of generator mode c) The magnetic field storing energy temporarily d) Responsible for energy flow from stator to rotor in case of generator mode Next Page Page 1 of 4 Submit Quiz O of 4 questions saved
Q2] Fill in the blank (9 Marks) 1- The critical resistance of the D.C. generator is the resistance of 2- A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly volt. 3- The current drawn by a 120 V D.C. motor of armature resistance 0.5 2 and back e.m.f. 110 V is ampere. 4- The direction of rotation of a D.C. motor can be reversed by V2 VI 5- A 440V/110Vtransformer has 1000 turns on the primary winding. The number of turns on the secondary is 6- The main purpose of performing open circuit test on a transformer is to measure its 7-A 3-phase, 4-pole, 50 Hz induction motor runs at a speed of 1440 r.p.m. The rotating field produced by the rotor rotates at a speed of respect to the rotor. r.p.m. with 8- The advantages of skewing in induction motor are and
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14/ 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 only
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1. (a) Identify the parts labelled A, B, C, D, E, and F for the motor shown in Figure 12. (b) Determine which way the motor will spin. Explain your answer. (c) What effect will reversing the current have? A -F B N

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