What happens to the rotor speed and rotorcurrent when the mechanical load on an in-duction motor increases?Would you recommend using a 50 hp in-duction motor to drive a 10 hp load?Explain.Give two advantages of a wound-rotor mo-tor over a squirrel-cage motor.Both the voltage and frequency induced inthe rotor of an induction motor decrease asthe rotor speeds up. Explain.

Step 1:Answers to Induction Motor Questions 1. What happens to the rotor speed and rotor current…

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Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 3RQ

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In your opinion, what happens to the rotor speed and current when mechanical load on an induction motor increases? B
2. A 2-pole, 50 Hz induction motor supplies 15 kW to a load at a speed of 2950 rpm. a. What is the motor's slip? b. What is the induced torque in the motor in N-m under these conditions? c. What will be the operating speed of the motor be if its torque is doubled? d. How much power will be supplied by the motor when the torque is doubled?
Please question 5 solution
L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no
Please question 4
pole. 50-Hz. 3-ϕ induction motor has a full-load speed of 950 rpm. At half load its speed would be ..... rpm a) 475 b) 500 c) 975 d)1000
A 20-hp, 110 V DC shunt motor has an efficiency of 88% and the exciting current of 4 amperes and an armature resistance of 0.04 ohm. What starting resistance is required for full-load torque?
I have less to submit please help me in this problem.
1. A 100 v dc series motors run at 400 rpm when taking a current of 55 Amp. Armature resistance is 0.03 ohm, field resistance is 0.03 ohm. If the load torque remains the same. What is the input current when the field is shunted by a resistor of 0.02 ohm? 2. A four-pole lap wound 500 V shunt motor takes a full-load armature current of 50A, the full-load speed being 800 r.p.m. There are 440 armature conductors and armature resistance is 0.3 ohm, contact drop brush = 1 V.Find the useful flux per pole.
7-7. A 208-V, two-pole, 60-Hz, Y-connected wound-rotor induction motor is rated at 15 hp. Its equivalent circuit components are R = X, = 0.410 2 = 0.200 N R2 = 0.120 N XM = 15.0 N X2 = 0.410 N %3D mech = 250 W misc =0 Pcore = 180 W For a slip of 0.05, find (a) The line current IL (b) The stator copper losses PSCL (c) The air-gap power PAG
QUESTION 2 a) Draw the equivalent circuit and torque-speed characteristic curve for a series DC motor. b) Briefly explain the induced torque occurs in a series DC motor. e) A 20-hp 240-V 76-A 900 rimin series motor has a field winding of 33 turns per pole. Its armature resistance is 0.09 2, and its field resistance is 0.06 2. The magnetization curve expressed in terms of magnetomotive force versus Ex at 900 rimin is given by the following table: Table Q2 c): The magnetomotive force table for a de motor taken at 900r'min E. V 95 150 188 212 229 243 F.A tuus 1000 1500 2000 2500 500 3000 If the motor running at 33 percent of the full-koad armature current, determine: ) The motor's power converted from electrical to mechanical form, Prene i) The motor's torque, Tnit ii) The motor's speed, n
What would be the number of poles if an induction motor runs under stable condition with a constant torque load at 1250 rpm off a 50 Hz supply?

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