which or which of the following are the stator losses in asynchronous motors?1. copper losses2. iron losses3. friction and wind losses
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which or which of the following are the stator losses in asynchronous motors?
1. copper losses
2. iron losses
3. friction and wind losses
Step by step
Solved in 2 steps
- I want answer ! A 250-V shunt motor runs at 1000 rpm, at no-load and takes 8A. The total armature and shunt field resistances are respectively 0.2 ohm and 250 ohm. Calculate the speed when loaded and taking 50 A. Assume the flux to be constant.(10) Match terms on left with best descriptions on right. v Torque a. Shifting of the neutral plane v Force b. Field coil is wound with fewer turns v Geometric Neutral Plane v Shunt Motor C. Field winding and armature connected in parallel d. The rate of doing work v Series Motor v Cumulative Compound Motor v Differential Compound Motor e. Magnetic field of windings are opposite polarity f. Rotary action exerted by a motor shaft g. Magnetic field of windings are same polarity v Power h. Armature loop at right angle to field flux lines Armature Reaction i. A push or pull that can cause motion7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th contact drop per brush is 1V. then the full-load speed of the motor is -- a) 675 r.p.m. b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,
- ASAP ASAP ASAP previous answer is wrongWhich of the following is true about the rotor windings of asynchronous motors?a. In rotor motors with rings, the rotor windings consist of rods placed in grooves.b. Rotor windings can consist of rod windings or normal conductors.c. The rotor windings are connected only in parallel to the stator windings.d. In squirrel cage rotors, the rotor windings consist of normal conductors.e. The rotor windings are arranged in three phases by star connection.Please answer question number 3
- True or fulseM1. Which of the following is the preferred method of changing the direction of rotation of a DC compound motor? 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 M2. If the resistance of a DC motor's shunt-field circuit is increased, what happens to the speed of the motor? a) it speed decreases b) it stays the same c) it speed increases d) none of the above M3. What is a common method of controlling the speed of a DC shunt motor? a) by adding rheostat in series with the armature b) by adding rheostat in series with the shunt field c) could be either "a" and "b" d) neither "a" nor "b"A 240 V shunt motor has an armature current of 15 A when running at 800 rpm against full-load torque. The armature resistance is 0.6 ohm. What resistance must be inserted in series with the armature to reduce the speed to 400 rpm at the same torque? What will be the speed if the load torque is halved with this resistance in the circuit? Assume the flux to remain constant throughout.
- A DC shunt motor takes an armature current of 20A at 800V, It has an armature resistance of 0.06 ohms and field resistance of 120 ohms. The machine has 8-poles and armature is lap connected with 964 conductors with a full load speed of 836 rpm. Calculate the line current and flux per pole. Select the correct response: 0.10 Wb and 10.22A 0.14 Wb and 12.44A 0,05 Wb and 14.58 A 0.15 Wb and 13,33A14.a. The reason for using a laminated stator core in a universal motor is toA. limit the eddy currents and the iron losses.B. limit the saturation of the magnetic circuit.C. maintain a constant level of magnetic flux.D. decrease the doc reactance of the field winding.14.b. If an induction motor has two protective housings for capacitors, it is aA. single-voltage capacitor-start motor.B. permanent-split capacitor-start motor.C. capacitor start-and-run motor.D. dual-voltage capacitor-strut motor.A three-phase, 60-Hz induction motor runs at 890 r/min at no load and at 840 r/min at full load. (a) How many poles does this motor have? (b) What is the slip at rated load? (c) What is the speed at one-quarter of the rated load? (d) What is the rotor’s electrical frequency at one-quarter of the rated load?