5. Which one of the following types of motors is not normally reversible? A. PM motor B. Brushless DC motor C. Universal motor
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5. Which one of the following types of motors is not normally reversible?
A. PM motor
B. Brushless DC motor
C. Universal motor
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- DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A, B and C) depending on the topic. 1. SYNCHRONOUS MOTORS A. What is necessary to start a synchronous motor to rotate from standstill? Describe the process. B. What is meant by synchronous condenser? C. Why is it possible for synchronous motors be used as a power factor correction device and what applications do synchronous motors commonly used? Describe the operation.Match motor types with their illustrations. OO PMSM IM Sync. Reluctance TIRA 110-V, 1-phase, 4-pole, 60-Hz induction motor has the following circuit constants: R1 = R2’ = 1.6 ohm,X1 = X2’ = 1.8 ohm, Xm = 60 ohm; core loss is 16 W and friction and windage loss is 12 W. Determine theefficiency of the motor at 0.04 slip by using (a) the exact equivalent circuit and (b) the approximateequivalent circuit
- Name the type of three-phase induction motor, which is used for high starting torque application a. Single phase induction motor b. DC motor c. slip ring rotor d. Squirrel cage rotor1- b)Does a DC motor's full-load speed have to be the same as its no-load speed in order for it to be classified as a "constant speed" motor? a) yes b) no c). The voltage produced by the generator action of a rotating DC motor is called a) counter-electromotive force (CEMF) b) back-EMT' c) either "a" or "b" d) neither "a" nor "b" d). Which of the following is/are a factor that will determine the amount of back-EMF generated by the generator action of a DC motor? a) number of armature conductors b) number of lines of flux (flux density) c) the speed at which the conductors are cutting the lines of flux (rate of incidence) d) all of the above15.a. Which one of the following types of motors is not normally reversible?A. Universal motorB. PM motorC. Brushless DC motorD. Servo motor15.b. The stray currents that are created as a magnetic material is magnetized and then demagnetized arecalledA. hysterysis currents.B. lag currents.C. pole currents.D. eddy currents.
- 1. Soru Which DC Motor(s) is(are) suitable for constant speed loads? (You can select multiple types) A) Permanent Magnet DC Motor B) Compound DC Motor O C) Shunt DC Motor O D)Series DC MotorWhat are the options suits for a slip ring induction motor? (A) Slip ring induction motor has high starting torque (B) Slip ring Induction motor has a complicated construction (C) Slip ring induction motor has high efficciency (D) Slip ring induction motor has more copper loss O a. (A) and (B) O b. (A), (B) and (C) O c. (A) and (C) O d. (A), (B) and (D)11/ Name the type of three-phase induction motor, which provides low starting torque. a. Squirrel cage rotor b. Single phase induction motor c. DC motor d. slip ring rotor
- hine. b) In rotating machines, how would the voltages be generated in windings or groups of coils? c) Sketch the Full-bridge driving circuit for the permanent magnet brushless (PMBL) DC motor. Q3/A switched reluctance motor has salient poles on ..................... a. neither stator or rotor b. Stator and rotor c. Rotor only d. Stator onlya)Explain the speed control methods of direct current motor. b)Compare linear current series motor, shunt motor and component motors in terms of torque and speed.