A 200-V, DC motor is connected as a cumulatively-compounded DC motor. Its characteristics are given below: RA=0.1092 NF-1000 turns This motor has compensating windings and interpoles. When the motor is rotating at 1680 RPM, 200V supply, 54 A armature current, the rotational losses are 1026 Watt. What is the efficiency of this motor? Answer The efficiency is: Rs = 0.05 2 RF 125 2 Radi = 100 2 NSE=10 turns IL, rated=55 A nm=1800 RPM %
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- • Q5/ in a DC motor. List and describe the types of losses that occur8. A 3-phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is ............ (i) 20 W (iii) 500 W (ii) 980 W (iv) 200 WThe rotor of a 3-phase, 60 Hz, 4-pole induction motor takes 118 kW at 3Hz. The motor has stator copped loss of 2.95 kW, a mechanical loss of 2kW and a stator core loss of 1.7 kW. Solve for the motor efficiency
- SThis course d. K = 101.86 and flux = 3.33 mWb / pole A 180-V, DC motor is connected as a cumulatively-compounded DC motor. Its characteristics are given below: RA=0.10 2 Rs=0.05 2 RF= 125 2 Radj = 100 2 %3D NF= 1000 turns NSE= 10 turns IL. rated = 55 A nm= 1800 RPM This motor has compensating windings and interpoles. When the motor is rotating at 1680 RPM, 180 V supply, 52 A armature current, the rotational losses are 933 Watt. What torque is induced by this motor? Select one: Oa. Induced Torque = 54.5 N.m Ob. Induced Torque = 50.9 N.m Oc. Induced Torque = 45.6 N.m. Od. None Is this armature winding a progressive.or a retro-progressive winding? 10A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit Part B Value I = HA Request Answer Submit If the dc-to-ac converter has a power efficiency of 90 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. HÅ Value Units Request Answer ? Units ?Q4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core Mc
- 13 A three-phase induction motor has a mechanical speed of 720 [rpm] and at full load has a slip of 5%. The number of poles and the frequency of this motor are: 4 poles 50 Hz. 6 poles 50 Hz. 8 poles 50 Hz. 6 poles 60 Hz.In a three-phase induction motor the maximum torque occurs at 20% slip and the equivalent resistance of the secondary is 0.04Ω per phase. Find the equivalent load resistance and the load voltage and the load current. Output power is 20 kW.In a DC motor the relation between the core loss (Pcore) and rotational loss (Protational) is O P core > Protationa O Protational > Pcore O None of these Protational Pcore 93°F Mostly sunny 底 ENG
- A 110 V, 60 Hz, 6 – pole single phase induction motor 1/3 hp has the following equivalent circuit impedances: RI = 1.52 ohm, R2 = 3.13 ohm and x1 =2.10 ohm, x2 =1.56 ohm. Xm=58.2 ohm, The Friction, windage and stry losses =16W, the core loss = 35 W, For a slip of 0.05, calculation (a) input current, (b) power factor, (c) developed power, (d) output power, (e) speed (f) in put power (g) air gab power (h) T ind (i) T load 6) efficiency.6- Which of the following supply is given to the rotor winding of 3-Phase Induction Motor: a) DC Supply b) AC Supply c) No Supply d) Pulsating Supply 7- 3-Phase Induction Motor will have Starting Torque and Starting Current a) High, High b) Low, Low. c) High, Low d) Low, High 8- Which of the following method is used for controlling the speed of an induction motor: a) Changing number of stator poles b) Supply voltage control c) Frequency control d) All the options are correct 9- Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor: a) Star-Delta Starting b) Line resistor startling c) transformer Starter d) Rotor Resistance Starting 10- The rotor of a stepper motor has no: a) windings b) commutator c) brushes d) all of the aboveA 3-0, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between slip-rings on open circuit. Calculate the current and power factor in each phase of the rotor windings at standstill when joined to a star-connected circuit, each limb of which has a resistance of 10 Q and an inductance of 0.03 H. The resistance per phase of the rotor windings is 0.2 Q and inductance 0.03 H. Calculate also the current and power factor in each rotor phase when the rings are short- circuited and the motor is running with a slip of 4 per cent. [13.6 A, 0.48; 27.0 A, 0.47] (London University) A 4-pole, 50-Hz, 3-phase induction motor has a slip-ring rotor with a resistance and standstill reactance of 0.04 2 and 0.2 2 per phase respectively. Find the amount of resistance to be inserted in each rotor phase to obtain full-load torque at starting. What will be the approximate power factor in the rotor at this instant ? The slip at full-load is 3 per cent. [0.084 2, 0.516 p.f.]…