Q2] Fill in the blank (9 Marks) 1- The critical resistance of the D.C. generator is the resistance of 2- A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly volt. 3- The current drawn by a 120 V D.C. motor of armature resistance 0.5 2 and back e.m.f. 110 V is ampere. 4- The direction of rotation of a D.C. motor can be reversed by V2 VI 5- A 440V/110Vtransformer has 1000 turns on the primary winding. The number of turns on the secondary is 6- The main purpose of performing open circuit test on a transformer is to measure its 7-A 3-phase, 4-pole, 50 Hz induction motor runs at a speed of 1440 r.p.m. The rotating field produced by the rotor rotates at a speed of respect to the rotor. r.p.m. with 8- The advantages of skewing in induction motor are and

Q2] Fill in the blank (9 Marks) 1- The critical resistance of the D.C. generator is the resistance of 2- A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly volt. 3- The current drawn by a 120 V D.C. motor of armature resistance 0.5 2 and back e.m.f. 110 V is ampere. 4- The direction of rotation of a D.C. motor can be reversed by V2 VI 5- A 440V/110Vtransformer has 1000 turns on the primary winding. The number of turns on the secondary is 6- The main purpose of performing open circuit test on a transformer is to measure its 7-A 3-phase, 4-pole, 50 Hz induction motor runs at a speed of 1440 r.p.m. The rotating field produced by the rotor rotates at a speed of respect to the rotor. r.p.m. with 8- The advantages of skewing in induction motor are and

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

A 2 pole wave wound dc shunt generator runs at a speed of 750 rpm, has an armature and shunt field resistance of 0.4 and 580 respectively. The armature has 960 conductors and flux per pole is 0.115 Weber. If the lamp load connected has a resistance of 70 determine (i) Generated EMF, (ii) Total Resistance, (iii) Armature Current, (iv) Terminal Voltage.
A shunt DC motor is supplied by 520V terminals voltage and is used to supply a mechanical load with rotating speed of 1000rpm. The armature is wave-wound and has 500 conductors. The useful flux per pole is 0.03Wb and there are 4 poles (2 pairs of poles). The armature resistance is 0.4 Ohms. Calculate: 1.The internal emf of the motor. 2.The armature current. CLEAR AND CORRECT OR DISLIKE
7. A 4-pole, d.c. shunt motor has a flux per pole of 0.04 Wb and the armature is lap-wound with 720 conductors. The shunt field resistance is 240 Ω and the armature resistance is 0.2 Ω. Brush contact drop is 1V per brush. Determine the speed of the machine when running (a) as a motor taking 60 A and (b) as a generator supplying 120 A. The terminal voltage in each case is 480 V.
A 250 V d.c. shunt motor draws 4 ampere current from mains at no load and rotates at 700 r.p.m. Find out speed of motor when input power is 8 kW. Motor armature and field resistances are 0.6 ohm and 100 ohm respectively.
H.W 1) A 4-pole, 500 V d.c. shunt motor has 720 wave-connected conductors on its armature. The full-load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Q and the contact drop is 1 V per brush. Calculate the full-load speed of the motor. H.W 2) A d.c. series motor with series field, and armature resistance of 0.06 ohm and 0.04 ohm respectively is connected across 220 V mains. The armature takes 40 A, and its speed is 900 rpm. Determine its speed when the armature takes 75 A, and excitation is increased by 15% due to saturation.
Q 4. An 8-pole DC generator has 400 armature conductors and a useful flux of 0.05 Wb. What will be the emf generated if it is lap wound and runs at 1,500 rpm? What must be the speed at which it is to be driven to induce the same voltage if it is wave wound? (Ans. 500 V; 375 rpm) 05 A vave wound armature generator has 51 slots Fach slot contains 20 conductors The
Q/Two dc generators A and B has the following characteristics:GA: rated voltage=150 volt: rated carrent=30Ampere: armature resistance (0.4Ω).GB:no_lond voltage=160Volt: rated carrent=20Ampere: armature resistance=(0.6Ω).The generators are connected in paralled. Draw the circuit diagram, then find:no_load circulating current and no_load voltage?At what carrent the generator B will Be floating? The maximum possible land power
4-pole, d.c. shunt motor has a flux per pole of 0.04 Wb and the armature is lap-wound with 720 conductors. The shunt field resistance is 240 Ω and the armature resistance is 0.2 Ω. Brush contact drop is 1V per brush. Determine the speed of the machine when running (a) as a motor taking 60 A and (b) as a generator supplying 120 A. The terminal voltage in each case is 480 V. 5 3 K4 8 Derive the Torque equation of a D.C Motor.
GENERAL INSTRUCTIONS: SOLVE EACH OF THE FOLLOWING PROBLEMS AND SHOW YOUR SOLUTIONS FOR EACH ITEM. 1. A long-shunt compound generator supplies 50 kW at 230 V. the total field- and armature circuit resistances are 46 ohms and 0.03 ohms , respectively. The brush-contact drop is 2 V. Determine the percent voltage regulation. Neglect the armature reaction.