At standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: OTrue O False
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- 3.) The time delay fuse using the strict standard rating for 2Ø, 230 V, 7.5 hp SCIM motor is A. 25 A B. 30 A C. 35 A D. Any of the abovec) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is experiencing run-time error and unable to start, based on your understanding, interpret the sequence of troubleshooting shall be carried out to identify the root cause of the abnormalities. 3P 1P MCB MCB STOP K1 START MOTOR Figure 3 (c)is the DC motor in figure 1 turning in the same direction as that in figure 3 ? a- yes b- no
- At standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: O True O False?3.64 The rotor frequency of a 3-phase, 5 kW, 400 V, 50 Hz, 4-pole slip ring induction motor is 25 Hz. The speed of the motor when connected to a 400 volt, 50 Hz supply will be 10 (a) 1500 rpm (c) 750 rpm (b) 1000 rpm (d) Zero14/ What are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a three-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I and II only b. I,II and III c. II and III d. I only
- If a centrifugal switch assembly in a split-phase or capacitor motor fails, you'll most likely have a A. slowly turning motor.B. loudly humming motor.C. motor turning at too high a speed. D. motor that has reversed direction while running.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 SPEEDSelect the best answer for each of the following. If an operator pushes a start button on a three-phase induction motor and the motor starts to hum, but not run, the probable trouble is a. one fuse is blown and the motor is single phasing. b. the overload trip needs resetting. c. the auxiliary contact is shorted. d. one phase is grounded.
- Select the best answer for each of the following. The purpose of overload protection on a motor is to protect the a. motor from sustained overcurrents. b. wire from high currents. c. motor from sustained overvoltage. d. motor from short circuits.5. A 220 V dc shunt motor takes 4 A at no-load and runs at 700 rpm. Ra = 0.60 ohm and Rf = 110 ohms. What is the speed of the motor when the motor input is 8800 W?A 400V, 60HZ, 6-pole wye connected , 30 induction motor draws 75KW with a line current of 100A. The core loss is 2KW, Friction and Windage loss is 1.2KW. The stator resistance between two terminals is 0.352. What is the efficiency if the motor runs at a slip of 2.5%?