E-a). The lower the speed setting, the_________ the impedance of run winding in a single-phase multi-speed motor. a) lower b) higher c) either "a" or "b" d) neither "a" nor "b"
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E-a). The lower the speed setting, the_________ the impedance of run winding in a single-phase multi-speed motor.
a) lower b) higher c) either "a" or "b" d) neither "a" nor "b"
E-b)The rotor of a single-phase repulsion motor gets its voltage
a) by induction b) direct wired from an external AC source c) direct wired from an external DC source d) all of the above
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- Q3) I. What' s the effect of The auxiliary winding of split - phase induction motor when it becomes short circuit ?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"B-a). A shaded-pole induction motor's rotating magnetic field is created by ___________ .a) multiple coils connected in parallel on the stator b) a capacitor connected in series with the starting windings c) a shading coil d) none of the aboveB-b). A shading coil of a single-phase shaded pole motor is designed_____________ to magnetic flux. a) concentrate b) oppose a change in c) enhance d) all of the above B-c).The shading coil of a single-phase shaded-pole motor has no influence when the current through the stator windings is at_________ electrical degrees. a) 0, 180, & 360 b) 90 & 180 c) 90 & 270 d) none of the above
- In DC shunt generator the type of current flows in field winding is AC whereas in armature winding it is DC. * True O False If the field winding of a DC shunt motor gets disconnected while in normal operation the speed will decrease to a tremendously low value and the motor may get stop. * True O False A DC series generator is considered suitable for general electric supply. * True False6- In a stepper motor, how is the speed of rotation determined? a) By the current supplied to the motor. b) By the magnitude of the voltage applied. c) By the load applied to the motor. d) By the frequency of the waveforms used. 7- A transformer core is laminated to a) reduce hysteresis loss b) reduce eddy current losses c) reduce copper losses d) reduce all above losses 8- An induction motor with 580 r.p.m. speed at 60 Hz will have a) 8 poles b) 6 poles c) 4 poles d) 2 poles 9- If any two phases for an induction motor are interchanged a) the motor will run in reverse direction b) the motor will run at reduced speed c) the motor will not run d) the motor will burn 10- No-Load speed of which of the following motor will be highest? a) Shunt motor b) Series motor c) Short-Shunt compound motor d) Long-Shunt compound motorA. The DC motor in Figure 3 on Worksheet 8 is aa) cumulatively connected short-shunt compound DC motor b) cumulatively connected long-shunt compound DC motor c) differentially connected short-shunt compound DC motor d) shunt DC motorB. Is the DC motor in Figure 1 on Worksheet 8 turning in the same direction as that in Figure 3?a) yes b) no
- Example -4. A three-phase. 60-Hz induction motor runs at 890 r/min at no load and at 840 r/min at full load. (a) How many poles does this motor have? (b) What is the slip at rated load? (c) What is the speed at one-quarter of the rated load? (d) What is the rotor's electrical frequency at one-quarter of the rated load?Q3) Mention Methods of starting of three phase induction motors and Single phase motors Discuss with Drawing only one of them ?What is the relationship between slip s) and load (Pa) in an induction motor? Please explain.
- 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 aboveC-a). The speed of a single-phase shaded-pole motor is determined by the _________________ . a) frequency of the supply b) number of poles on the stator c) both "a" and "b" d)_ neither "a" nor "b" C-b).. The single-phase shaded-pole motor has low______ torque. a) starting b) running c) both "a" and "b" d) neither "a" nor "b" C-c). The single-phase shaded-pole motor is considered nonreversible. a) true b) falseHere it is the equivalent circuit of and induction motor and it is per phase circuit my question is name for me the variable for example R1 is the winding resistance and so an the all variable and please show me a pic of the real machine with the variable for example for R1 happens because of the winding i need to see the winding in the real machine, please help me to understand well