Compare between 2-phase motor and universal motor
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- In DC generators, lap winding is suitable for ) high voltage, high current O low voltage, high current O high voltage, low current O ) low voltage, low curren O3 phase motors are widely used in the industry. they require little maintenance, having no brush gear or centrifugal switch, are robust and relatively inexpensive.Fhe number of parallel paths and the number of series conductrs required for a given kW reting are determined by. System voltage Armature resistance Type of winding Field current
- In a workshop, there is a three-phase asynchronous motor with a power of 6 HP, an efficiency of 85%, and a power factor of 0.8. Find the capacitor capacity required for power factor correction in the workshop. (The capacitors will be connected in a delta configuration.) A new power factor of 0.95 is desired. The nominal voltage in the workshop is given as 0.4 kV. (1 HP = 0.745 kW)1-R2(1/s-1) in induction motor parameter represents a. non indcutive resistance of mechanical load b. Rotor resitance c. copper losses d. stator resistance referred to rotorthe field windings of a series motor has a resistance of 120 ohms at 15° c. after running for 2 hours, the resistance has increases to 140 ohms. if the temperature coefficient of the windings at 0°C is 0.004, find the new temperature of the windings
- T-a. The direction of rotation of a single-phase split-phase motor can be change by........ a) reversing the connection of the start winding b) reversing the connection of the run winding c) reversing the connection of the start and run winding at the same time d) "a" or "b", not "c" T-b. Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about__________ time per hour. a) 8 b) 12 c) 24 d) none of the above T-c. When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with__________ . a) a smaller one b) one of the same size c) a larger one d) none of the aboveProblem 3 A 460-V 60-Hz two-pole Y-connected induction motor is rated at 75 kW. The equivalent circuit parameters are: R, = 0.075 N R, = 0.065 N X = = 0. 17 N X, = 0. 170 X = 7.20 %3D 2 M 1.0 kW P misc = 150 W P = 1.1 kW f& w core The slip of the motor is 0.04. a. Calculate the stator copper loss. Page 1 of 2 b. Calculate the rotor copper loss. c. Determine the efficiency of this motor1- which of the following 3-phase motors has a wire wound rotor a- polyphase induction motor b-polyphase wound rotor motor c- both a and b d- neither 2- which of the following 3-phase motors has a more maintenance free design. a- 3-phase wire wound rotor b- 3-phase squirrel-cage rotor
- A shunt generator has an induced voltage on open circuit of 127 V. When the machine is on load the terminal voltage is 120 V. The load current if the field resistance be 15 ohm and armature resistance be 15 .ohm 342 O 350 A O 358 A O 10A ODesign a model for series connected D.C. motors using electrical and mechanical equationsThe field windings of the series motor have a resistance of 120 ohms at 15-degree C. After running for two hours, the resistances increase to 140 ohms. If the temperature coefficient of the windings at 0 degree C is 0.004, find the new windings of the temperature