5.18. A small DC machine has an armature resistance of 4 ohms. Under no-load conditions when connected to a 28V DC source it has a measured speed of 700rpm. During a different test, a load resistance of 18 ohms is placed on the generator when it is driven at 1,000rpm. Calculate the generator electrical output power under this condition.

5.18. A small DC machine has an armature resistance of 4 ohms. Under no-load conditions when connected to a 28V DC source it has a measured speed of 700rpm. During a different test, a load resistance of 18 ohms is placed on the generator when it is driven at 1,000rpm. Calculate the generator electrical output power under this condition.

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 DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field resistances are 0.01 2 and 44N respectively. The stray losses are 375 W. What is percentage efficiency of the DC generator
1.Two identical shunt generators running in parallel, each with armature resistance of 0.02 ohms and field resistance of 50 ohms. The combined load current is 5000A. The field are so excited that the generated voltages of one machine is 610V and the other is 600V. The terminal voltage of this parallel combination will be. www Ish1 Rh1 a.350-360 V b.450-460 V c. 550-560V Rat www az G₂ Raz 5000 A Ish2
A dc generator is run at 500 rpm. The eddy current losses and hysteresis losses are found to be 100 and 200 W, respectively. At what speed will it be run to reduce the core losses by 20%?
A 2 pole wave wound dc generator has 44 slots, each slot having 20 conductors. The flux/pole is 0.018 weber. At what speed the armature be rotated to get an induced emf of 220 V. What will be the induced emf developed if the armature winding is lap connected and runs at the same speed. Speed Generated Emf when lap connected
Question: A 4 Pole DC Generator Is Wounded Lap. It Rotates At 500rpm To Be Able... A 4 pole DC generator is wounded lap. it rotates at 500rpm to be able to generate 150 V of open circuit voltage. What is the percentage decrease in the exixting flux per pole if a frequency of 10 rps can produce 120 V? %.
A dc shunt generator delivers 50 kw at 250 v, its armature has a 4-pole wave winding with a resistance of 0.01 ohm and its field resistance is 125 ohm. if the number of turns in the armature is 201 and the flux per pole is 0.02 wb, find the voltage generated and the speed of operation. *
Two identical 2,000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum load that can be delivered without overloading either machine?
Q5. A wave-wound armature of a 6-pole generator has 51 slots. Each slot contains 20 conductors. The voltage required to he generated is 250 v. What would be the speed of coupled prime mover if flux per pole is 0.07 Wb. If the armature is rewound as lap-wound machine and run by same prime mover, what will be the generated voltage? (Ans. 70 rpm; 83.3 V) Q6. A 4-pole wave-wound armature rotating at 400 rpm is required to generate 300 V. The effective flux per pole is about 0.05 Wb. If the armature has 120 slots, determine the suitable number of conductors per slot and hence determine the actual value of flux required to generate the same voltage. (Ans. 4: 46.875 mWb)
How voltage is built up in dc shunt generator
Q-4 100 MVA, 50 Hz alternator is operating at rated speed. The H constant of the machine is 5 MJMVA. The load suddenly increases by 50 MW. Due to delay in governor action, there is a delay of 0.5 sec in opening of steam value. The frequency deviation in percentage is
Q 5. A wave-wound armature of a 6-pole generator has 51 slots. Each slot contains 20 conductors. The voltage required to be generated is 250 V. What would be the speed of coupled prime mover if flux per pole is 0.07 Wb. If the armature is rewound as lap-wound machine and run by same prime mover, what will be the generated voltage? (Ans. 70 rpm; 83.3 V)
The DC shunt generator with the terminal voltage 300 V, armature drop 7 V and the each brush drop 4 V, then the value of generated emf is