Fill in the blank:1- Lap winding is suitable for -----current,voltage d.c. generators.2-A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torqueproduced when the armature current is 20 A, isN-m.3- The d.c. series motor should never be switched on at no-load because4- The equation relating the generated e.m.f., E, terminal voltage, armature current andarmature resistance for a d.c. motor is E =‒‒‒‒‒‒‒‒‒‒‒5- A transformer having 1000 primary turns is connected to a 250 V a.c. supply. For asecondary voltage of 400 V, the number of secondary turns should beturns.6- The equivalent resistance of the primary of a transformer having N2/N1 = 5 and R1 = 0.1ohm when referred to secondary becomesohm.7- The maximum efficiency of a 100 kVA transformer having iron loss of 900 W and F.L.cu loss of 1600 W occurs at - kVA.‒‒‒‒‒‒‒‒‒‒‒‒‒8- If Cu loss of a transformer at 7/8 full load is 4900 W, then its full-load Cu loss would bewatt.

“Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

Fill in the blank: 1- Lap winding is suitable for current, voltage d.c. generators. 2-A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque N-m. produced when the armature current is 20 A, is --------- 3- The d.c. series motor should never be switched on at no-load because 4- The equation relating the generated e.m.f., E, terminal voltage, armature current and armature resistance for a d.c. motor is E = ‒‒‒‒‒‒‒‒ ‒‒‒‒‒‒‒‒‒‒

Fill in the blank: 1- Lap winding is suitable for current, voltage d.c. generators. 2-A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque N-m. produced when the armature current is 20 A, is --------- 3- The d.c. series motor should never be switched on at no-load because 4- The equation relating the generated e.m.f., E, terminal voltage, armature current and armature resistance for a d.c. motor is E = ‒‒‒‒‒‒‒‒ ‒‒‒‒‒‒‒‒‒‒

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

(7) The only parts suffers from eddy currents in AC motors: a- The stator. b- The rotor. c- The stator and rotor. (8) The unit of torque is a- W (rad. s') b- Js -1 C- Nm
Fill in the following blanks 1.In order to have sparklesscommutation, the brushes should be placed along................. 2.D.C. series motor are used in those applications where...............starting torque is required
6- 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 motor
1.5 A 10‐pole, 380 ‐V, 50 Hz, D‐connected three‐phase induction motor is rotating a quarry belt conveyor. The machine has the following parameters, referred to the stator, on a per phase basis: Stator Parameters Winding Resistance................0.19 Ω ......... Winding Reactance.................1.12 Ω.......... Rotor Parameters Winding Resistance......................0.29 Ω Winding Reactance.....................1.12 Ω Magnetising Reactance................................16.8 Ω Equivalent Core‐loss Resistance....................900 Ω. The friction and windage losses are 320 W. When the motor runs at its rated slip of 2.6 %. Determine: 1.5.1 The stator current. 1.5.2 Estimate the Output torque of the motor under the rated conditions. 1.5.3 The Motor…
Q4) What is the effect in series motor if you assume V = Eb , with low resistance fielding winding ? a) b) The given information about series motor on full – load (with that the flux is proportional to the field current) is a ) takes ( 78A) and runs at (850 r.p.m) , the series winding resistance is (0.04 2) , with diverter in parallel with the field winding is a (0.18 2) and the armature resistance is (0.09 S2). ( 220 V Neglected the iron, friction and windage losses. Determine the efficiency , speed when developing full load torque ,the maximum efficiency .
1. Laminations of core are generally made of. fe ST 37. 2. In case of the induction motors the torque is directly proportional to... 3. The easily method applicable to control the speed of the S.C.I.M motor is 4. The eddy current loss of ac motor is 100W at 50HZ. Its loss at 100HZ will be e0 E2
16 A 4-pole dc series motor has wave connected winding with 600 conductors. When fed from 250 V dc source, the motor drives a load of 5 kW and takes 50 A with a flux per pole of 10 mWb. The torque developed is (Neglect losses).
2-1 Discuss different types of DC motor, Draw equivalent circuit and Torque speed characteristics for all. 2-2 A 20-hp 240-V 76-A 900 r/min series motor has a field winding of 33 turns per pole. Its armature resistance is 0.09 ohm, and its field resistance is 0.06 Ohm. The magnetization curve expressed in terms of magnetomotive force versus EA at 900 r/min is given by the following table: Armature reaction is negligible in this machine. Rotational loss is 1.5KW. E, V 95 150 188 212 229 243 F, A turns 500 1000 1500 | 2000 2500 3000 Compute the motor's torque, speed, and output power at 158 % of full-load armature current. (Neglect rotational losses.)
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) no
B/ Fill in the blanks: TV ezur 1- In a three-phase induction motor iron losses in stator will be..... that in rotor. 2- In three-phase induction motors sometimes copper bars are placed deep in the rotor to........... 3- Blocked rotor test on induction motors is used to find out. R..., ke, X. 4- The maximum torque in an induction motor depends on .............and .....
6. A 30-kW, 250-V dc long shunt generator has armature, series and shunt field winding resistances of 0.065 Q, 0.10 Q, and 125 Q respectively. It has a maximum efficiency of 88.17%. Determine the voltage regulation at maximum efficiency. Calculate also the voltage regulation and efficiency at 97.77% load.
need asap A dc series motor runs at 1000 rpm when taking 20-A at 200-V. Armature resistance is 0.5-ohm. Series field resistance is 0.02-ohm. Find the speed for a total current of 20-A when a diverter resistor of 0.2-ohm is used across the series field. Flux for a field current of 10-A is 70 % of that for 20-A.