The suggested overload factor, K0, for a perfectly smooth electric motor driving a perfectly smooth generator through a gear type speed reducer is
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The suggested overload factor, K0, for a perfectly smooth electric motor driving a perfectly smooth generator through a gear type speed reducer is |
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- 1) answer the questions below. a) Does the slip increase as the load increases? What is the reason of this? b) What does it mean if the slippage is 0, 1, -1? Explain. c) Explain the effect of the capacitor on the operation of the asynchronous machine as a generator. d) Squirrel cage asynchronous motor, which has never been used before, will be operated as a generator at the first use. Does the machine work as a generator? Explain. e) How can we calculate the speed of the induction motor pro ed that the asynchronous motor driver keeps the slip value constant? Explain that you can adjust to different values.Shunt generator will build up its voltage when: Olts field resistance higher than critical value. Olts field resistance is less than critical value.Which of the following factor is responsible for negative voltage regulation of a DC generator? Under compunding Over compounding Flat compounding Critical resistance
- A 250 kW, 230 Volt compound generator is delivering 800 Amp at 230 V. The shunt field current is 12 Amp. The armature resistance is 0.007 ohm and the series field resistance is 0.002 ohm. The stray power at this load is 5500 Watts. The generator is connected long shunt. Determine the generator efficiency at this load. Stray load loss is 1% of outputIf current taken by series motor is increased from 10 A to 13 A, the percentage increase in its torque is percent, neglecting saturation. О 80 O 39 O 69 O 44 In a DC generator, the effect of armature reaction on the main field is to reverse it distort it O reduce it both (b) and (c)9. The synchronous speed of a three-Phase induction motor depends on the number of magnetic poles in the machine and the actual speed of rotation the actual speed of rotation and the applied Voltage in RMS the actual speed of rotation and number of magnetic poles intensity on the rotating magnetic field and the applied Voltage in RMS frequency of the applied voltage and the number of magnetic poles in the machine
- 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 aboveName three factors that determine the torque produced by an induction motor.23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -
- A 15-kV 35-KVA 0.76-PF-lagging 50-Hz four-pole Y-connected steam-turbine generator has a synchronous reactance of 3.50 0 per phase and an armature resistance of 0.75 0 per phase. This generator is operating in parallel with a large power system (infinite bus). a) What is the magnitude of E, at rated conditions? b) What is the generator's torque angle at rated conditions? c) If the field current is constant, what is the maximum power possible out of this generator? How much reserve power or torque does this generator have at full load? d) Sketch the corresponding phasor diagram and calculate for the armature current (assume the field current is still unchanged) e) At the absolute power possible, how much reactive power will this generator be supplying or consuming?A-1)- a- Which of the following is/are a general class of single-phase split-phase motor? a resistance-start induction-run b capacitor-start induction -run c) capacitor-start capacitor-run d) all of the aboveb-The single-phase split-phase motor operates on the principle of a rotating magnetic field. a) true b) false c- The voltages in a 2-phase power system are_______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above d-The voltages in a 3-phase power system are______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above e- Which of the two stator windings used on single-phase split-phase motors is made up of smaller wire? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b"No load test was conducted on a three phase induction motor at different input voltages and the input power obtained was plotted against the input voltage. The intersection of the extrapolated curve on the Y-axis, would give (a) rated core loss (b) windage and friction loss (c) rated copper loss (d) rated core loss and windage and friction loss