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.2 Explain different modes of operation of a 3 Ø Induction Motor with reference to the value of slip with the neat sketch of speed torque profiles. a. 0 < Slip < 1 b. 0 < Slip < -1 c. Slip > 1What types of motors contain brushes and a commutator? What is the function of these parts?
- (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,Skewing of rotor conductors in a squirrel cage induction motor reduces a. heat developed while rotating b. friction while rotating c. humming noise while rotating d. Vibrations while rotating
- As shown in the figure below, this is a speed regulation method for DC separately excited motor. a) What is the speed regulation method? b) What are the characteristics for this speed regulation method? no ne 11₂ 2 11₂ I I D E Ra R₂ Rs 1 3Here it is the equivalent circuit of and induction motor and it is per phase circuit my question is name for me the variable for example R1 is the winding resistance and so an the all variable and please show me a pic of the real machine with the variable for example for R1 happens because of the winding i need to see the winding in the real machine, please help me to understand wellWhich 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.
- The armature winding of 200 V 4-pole series motor is lap connected. There are 280 slots and each slot has 4 conductor, The armature current is 45 A and the flux per pole is 18 mwb. The field resistance is 0.3 ohm. Armature resistance is 0.5 ohm and the iron and mechanical losses are 800 W. find the shaft (output) torque.Fill in the following blanks 1.In order to have sparklesscommutation, the brushes should be placed along................. 2.D.C. series motor are used in those applications where...............starting torque is requiredExample -4. 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?