electricians can observe the evening blackening of all motor engines that occurs when the motor has failed due to what
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electricians can observe the evening blackening of all motor engines that occurs when the motor has failed due to what
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- 26. Is the amount of motor reactive power Q higher than the amount of motor active power P when the three-phase induction motor operates without load? O No O Yes What does this indicate about three-phase induction motors operating without load?The NEC requires that each phase of a motor be protected by an overload relay.which of the following is sometimes referred to as the motor secondary of a 3 phase induction motor ? a- stator b- rotor c- both a and b d- neither
- If the applied voltage drops to half value while the asynchronous motor is running at full load, which of the following situations will occur? A) MOTOR CURRENT DOES NOT CHANGE B) THE ENGINE CONTINUES TO WORK AT THE SAME SPEED BECAUSE THE FREQUENCY DOES NOT CHANGE C) ENGINE MAY REACH AND STOP D) ENGINE SPEEDD is the correct option explain properly pleaseA 10 pole, 25 Hz alternator is directly coupled to and is driven by 60 Hz synchronous motor. What is the number of poles for the synchronous motor?
- QUESTION 1 A three phase induction motor runs on 60 Hz power line at 1070 rpm at full load. The motor has one pair of poles for each phase. What is most nearly the motor's synchronous speed ? 1200 rpm 900 rpm 1600 rpm O 300 rpm QUESTION 2 What is most nearly the motors full -load slip, from question #1 ? O 10.8 9% 3.2 % 14.2 % 2.7 %Differentiate between the AC and DC magnetic fields applied to an induction motor stator.. A) Which of the following is/are a part of a 3-phase induction motor? a) stator b) rotor c) both "a" and "b" d) neither "a" nor "b" B) Which of the following is sometimes referred to as the motor secondary of a 3-phase induction motor? a) stator b) rotor c) both "a" and "b" d) neither "a" nor "b" C) How does the rotor of a 3-phase induction motor get power? a) through brushes and commutator segments b) through brushes and slip rings c) induction from the stator d) none of the above
- 7. Conventional rotating exciter is basically a (a) d.c. shunt generator (c) d.c. series motor (b) d.c. series generator (d) d.c. shunt motor 8. With reduction of load on an alternator (a) The frequency increases (b) The frequency decreases (c) The frequency oscillates (d) The frequency remains constant 9. If the field of one of the alternators running in parallel is adjusted it will (a) Reduce its speed (b) Change its load (c) Change its power factor (d) Change its frequency. 10. If the field of one of the alternators running in parallel is adjusted it will (b) Change its load (a) Reduce its speed (c) Change its emf (d) Change its frequency.Synchronous Generator: . 3ph, 1.0 MVA, 2.3kV, 50HZ, 0.85 lagging power factor, X.=0.9 pu Synchronous Motor: 3ph, 0.5 MVA, 2.3kV, 50HZ, 0.85 leading power factor, X, =0.8 pu Synchronous Synchronous generator motor The generator is equipped with a voltage regulator which maintains the terminal voltage at the rated value. The motor delivers 500 hp and it field current is adjusted to make it operate at unity power factor. i. Determine the synchronous reactance in ohms. ii. Determine the excitation voltage of each machine. Draw the phasor diagrams II.A Flyback converter (for questions 1-3) shown below has the following parameters. Vin-100v, Vo-20V, Po-ioW, D-025, Fsw-250kHz 4. The magnetizing inductor at the primary side winding is 100uH, what is the peak current in the power switch? A. 1.8A B. 1.6A C. 2.1A D. None of the above
