What is the starting torque developed by a split-phase motor? or a capacitor start
Q: Which type of motors are not self-starting? Select one: O a. DC Generator O b. Single Phase…
A: At the point when single-stage AC supply is given to stator winding. It produces rotating flux. i.e.…
Q: 3. A 6-pole, 3-phase, 50 Hz induction motor has a rotor resistance of 0-02 2/phase and standstill…
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Q: An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 720 rpm. The frequency of the…
A: Poles P = 8 Frequency f= 50 Hz Speed Nr = 720 rpm Frequency of the rotor current fr = ?
Q: |Compare between the capacitor-start and the shaded pole motors.
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Q: 16. What is the difference between synchronous speed and rotor speed of a 3-phase squirrel-cage…
A: Here we need to tell difference between synchronous speed and rotor speed to motor
Q: An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 700 rpm. The frequency of the…
A: Given values are - f=50HzP=8Nr=700rpm
Q: 13-28 A 3-phase, 5000 hp, 6000 V. 60 Hz 12- pole wound-rotor induction motor turns at 594 r/min.…
A: Given: A three phase wound rotor induction motor P0=5000 hp=5000×746 W=3.73 MWf=60 HzP=12V=6000…
Q: An 8 pole single phase induction motor is running at 690 rpm.what is the slip with respect to…
A: Given: A single phase induction motor with Number of poles, P=8 Motor speed, Nr=690 rpm
Q: what are the three major types of split phase motors?
A: The three major types of split phase induction motors are: 1) resistance start induction motor…
Q: 5. A 3-phase,4-pole induction motor is operating at frequency of 60Hz. Determine the a) synchronous…
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Q: The more used type of induction motors in industry is Select one: O a No one of mentioned answers O…
A: Induction motor: it works based on principle of electromagnetic induction Principle: whenever a…
Q: Capacitor-run motor has better power factor while running but it has low starting torque, why?
A: A capacitor run motor has two capacitor, out of which C1 (run-capacitor having 2 to 2.5 micro farad)…
Q: 125. For a 3-phase, 4-pole, 50 Hz synchronous motor the frequency, number of poles, and load torque…
A: we need to find out speed.
Q: Which type of motors are not self-starting? Select one: O a. DC Generator O b. Single Phase…
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Q: How could the direction of rotation of a single-phase capacitor-start induction motor be reversed?
A: The motor contains two windings first is the main winding and the second is the starter winding.…
Q: The starting torque of slip ring induction motor is O Low O Negligible O High O Medium
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Q: 3. A 6-pole, 3-phase, 50 Hz induction motor has a rotor resistance of 0-02 2/phase and sta reactànce…
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Q: A three-phase. 50 Hz. 4-pole induction motor runs at no-load with a slip of 1%. With full load, the…
A: Given 4 pole, 50 Hz I.M has no load slip 1%4 pole, 50 Hz I.M has full load slip 5%NS = 1500 rpmN0=Ns…
Q: Comment about effect of decrease supply frequency on three phase induction motor speed.
A: Formula for sycronous speed in induction motor is Ns=120 fp Where f is supply frequency P is…
Q: A 6-pole, 50hz, 3-phase induction motor has a fully load speed of 950 rpm. Its speed in Rpm at half…
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Q: A three-phase, 60 Hz induction motor operates at a slip of 2.5% and a speed of 1170 RPM. a. What is…
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Q: What will be the effect of increasing the mechanical load on a synchronous motor? Assume the field…
A: A synchronous motor is a synchronous machine that converts electrical power to mechanical power at a…
Q: An induction motor has rotor resistance of 6 (ohm) and reactance of 8(ohm). Neglect stator…
A: Given values are - Rotor resistanceR2=6OhmRotor reactanceX2=8OhmStator resistanceR1=0OhmStator…
Q: Phase 1 Stepping Sequence (full- stepping) for a Two-Phase PM Stepper Motor with Two Rotor Poles…
A: In the question we can four individual cases for four different states of two phase. Each phase has…
Q: 23 A 50 Hz split-phase induction motor has a resistance of 50 and an inductive reactance of 200 in…
A: In this question, We need to determine the value of resistance R and capacitance C are connected in…
Q: Which type of motors are not self-starting? Select one: O a. DC Generator O b. Single Phase…
A: The objective is to determine the correct option for the motor which is not self starting.
Q: What happens if field winding of the synchronous motor is short * circuited First, starts as…
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Q: A three-phase 60-cycle six-pole 220V wound-rotor induction motor has a stator that is connected in…
A: Given : Supply frequecny = 60 hz no. of poles (P) = 6 Supply voltage = 220 V Rotor speed = 1110…
Q: While starting a synchronous motor by induction motor action, field winding is. usually Connected to…
A: we have damper winding on rotor surface to avoid oscillations and to start the synchronous motor .…
Q: (a) The typical starting current for induction motor (i.e., at s=1) is five to eight times of the…
A: Induction motor:- It is a AC motor that runs at lower speed than synchronous speed so it is also…
Q: 2-The speed of a slip-ring induction motor cannot be controlled by: (a) Rotor resistance control.…
A: B)pole changing method We can control the speed of induction motor with help of rotor resistance and…
Q: Enumerate different losses that take place in a loaded shunt motor.
A: There are different losses in dc loaded shunt motor. Armature resistance lasses. When armature…
Q: A three-phase squirrel cage induction machine with rated frequency of f = 50 Hz has a rated slip Sn…
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Q: A three phase 6 pole , 50 Hz induction motor has a slip of 1 % at no load and 3% at full load. Find…
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Q: Starting torque of induction motor is less than that of a. DC shunt motor b. AC series motor c. DC…
A: Dc series motor has highest starting torque compare to all motors. Therefore starting torque of…
Q: a) the magetising current (Im) of 3-phase motor b) how will you design the rotor of a squirrel cage…
A: Electrical machines can be either generators or motors. They can be either Ac machines or DC…
Q: Compare between the capacitor-start and the shaded pole motors.
A: The comparison is given as: Capacitor start motor Shaded pole motor 1. It is mainly used for…
Q: Compare the operating and starting characteristics of a split-phase motor and a capacitor-start…
A: Compare the operating and starting characteristics of a split-phase motor and a capacitor-start…
Q: Explain the working principle of the synchronous motor and the 3-phase induction motor with the…
A: When a 3 phase electric conductors are placed in a certain geometrical positions (In certain angle…
Q: Q-2:- A30, 460 V, 100 hp, 60 Hz, four-pole induction motor delivers rated output power at a slip of…
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Q: In a three phase induction motor, voltage between the slip rings at standstill is 50 V. At full load…
A: According to the question, given, voltage between the slip rings at standstill = 50 V full load the…
Q: 18. What is the frequency on the rotor of a 3-phase squirrel-cage induction motor, when the rotor is…
A: When the rotor is at standstill condition, the speed of the rotor is zero. So, the value of slip is,…
Q: 26. Is the amount of motor reactive power Q higher than the amount of motor active power P when the…
A: When a three-phase induction motor operates on no-load then the line current drawn by the motor is…
Q: A three phase, 50 Hz, 4 pole slip ring induction motor runs at 1455 rpm on full load. The rotor…
A: Given, f=50 HzP=4Nr=1455 rpmR2phase=0.2 Ω
Q: What kind of AC motor is most frequently driven by an AC drive? Group of answer choices synchronous…
A: In this we will write about motor used in drive...
Q: A. Name different types (starting method) of Single-phase induction motor and draw their stator…
A: Since you have posted multiple different questions. we will solve the first question for you. To get…
Q: A three-phase 60 Hz two-pole induction motor runs at a no-load speed of 3500 rpm and a full-load…
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Solved in 3 steps
- a) Why the slip of induction motor is never zero, b) What happens if the slip of induction motor is one, c)What is the value of the slip for an induction motor at no load and full load.L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no4- A 3-phase A -connected 220-V (line-to-neutral), 60-Hz 6-pole induction motor has the following parameter values in O/phase referred to the stator: R1 = 0.294, R2 = 0.144, X, = 0.503, X2 = 0.209, Xm= 13.25. The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 5%, a. Output torque b. Stator current, c. Power factor, d. Converted power e. Efficiency.
- 7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th contact drop per brush is 1V. then the full-load speed of the motor is -- a) 675 r.p.m. b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,Q2] Fill in the blank (9 Marks) 1-The current drwan by the armature of D.C. motor is directly proportional to 2- The speed of a D.C. shunt-wound motor will shunt field regulator is increased. 3- The synchronous speed of a three-phase induction motor is number of pairs of poles. Rotor copper losses Rotor input power in induction motor = 5- A 4-pole three-phase induction motor has a synchronous speed of 25 r.p.s. The frequency of the supply to the stator is_ Hz. 6- The power input to a mains transformer is 200VA. If the primary current is 2.5A, the secondary voltage is 2V and assuming no losses in the transformer, the turns ratio step down. is 7- A 200kVA transformer has an iron loss of 1 kW and full load cu loss of 2 kW. Its load kVA corresponding to maximum efficiency is kVA. 8- If cu loss of a transformer at 7/8th full load is 4900 W, then its full-load cu loss would be watt. 4- if the value of resistance of the proportional to the 9- The slight curvature at the lower end of the open…A 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
- 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?4- A 3-phase A -connected 220-V (line-to-neutral), 60-Hz 6-pole induction motor has the following parameter values in /phase referred to the stator: R1 =0.294, R2 0.144, X 0.503, X2 0.209, Xm= 13.25. The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 5%, a. Output torque b. Stator current, c. Power factor, d. Converted power e. Efficiency.P-1).. Which of the following determine the amount of torque produced by a single-phase split-phase motor? a) The strength of the magnetic field of the stator b) The strength of the magnetic field of the rotor c) The phase angle difference between the current in the start winding and the current in the run winding d) all of the above P-2). The phase angle difference between the currents in the start winding and run winding of a single-phase split-phase motor is typically 90 degrees. a) true b) false P-3). A centrifugal switch is used to disconnect the________ winding of a non-hermetically sealed single-phase split-phase motor at approximately 75% of rated speed. a) run b) start c) either "a" or "b" d) neither "a" nor "b" P-4). Where an internal centrifugal switch cannot be used, an external______ relay can be used to perform the same function in a single-phase split-phase motor. a) hot-wire b) current c) solid-state starting d) all of the above
- K-1)The speed of a 3-phase wound-rotor induction motor can be changed by varying the amount of resistance in the rotor circuit. a) true b) false K-2). Which of the following statements are true about a 3-phase synchronous motor? a) It is a constant speed motor even under varying loads. b) It runs at the same speed the magnetic field rotates on the stator. c) It can correct its own, and the supply line's power factor d) all of the above K-3. A) What determines the speed of a 3-phase synchronous motor? a) the number of poles b) the frequency of the supply c) both "a" and "b" d) neither "a" nor "b" K-3)B) From a technician's standpoint, which of the following is the most practical method of providing a wide range of speed control for a 3-phase synchronous motor? a) by changing the frequency b) by changing the number of poles c) both "a" and "b" d) neither "a" nor "b"A 6-pole, 230-V, 60-Hz, Y-connected, three-phase induction motor has the following parameters on per-phase basis: R1=0.5 N, R2=0.25 N, X1=0.75 N, X2=0.5 , Xm=100 Q and R=500 N. The friction and windage loss is 150W. The rated slip is 2.5%. Determine: a) Rated speed b) Stator current c) Power factor d) Pcony and Pout e) Tind and tiload f) EfficiencyThe rotor resistance and standstill reactance of a 3-phase induction motor are 0.015 Q and reactance 0.09 0 per phase. (i) What is the p.f. of the motor at start? (ii) What is the p.f. at a slip of 4 per cent? (iii) If the number of poles is 4, the supply frequency is 50-Hz and the standstill e.m.f. per rotor phase is 110 V, find out the full-load torque. Take the full-load slip as 4 per cent.