1: A motor is working at a constantload of 100 h.p. in 5 min. then worksat no load for 8 min. after which itworks at a constant rate of 50 h.p. for10 min. Then, a no load period of 3min. The cycle is repeatedindefinitely, estimate suitable size ofmotor and sketch the load cycle ofmotor working. 2: Calculate the maximum load ofmotor reached over full load that canbe carried by a 25 kW output motor,if the temperature rise is not toexceed (50) C after one hour onoverload. The temperature rise on fullload, after 2 hour is (30) C and after 4hours is (40) C. Assume lossesproportional to square of load.

As per bartleby expert policy only one individual question is to be answered.

1: A motor is working at a constant load of 100 h.p. in 5 min. then works at no load for 8 min. after which it works at a constant rate of 50 h.p. for 10 min. Then, a no load period of 3 min. The cycle is repeated indefinitely, estimate suitable size of motor and sketch the load cycle of motor working.

1: A motor is working at a constant load of 100 h.p. in 5 min. then works at no load for 8 min. after which it works at a constant rate of 50 h.p. for 10 min. Then, a no load period of 3 min. The cycle is repeated indefinitely, estimate suitable size of motor and sketch the load cycle of motor working.

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 PM DC motor with torque constant kPM is usedto power a hydraulic pump; the pump is a positivedisplacement type and generates a flow proportional tothe pump velocity: qp = kpω. The fluid travels througha conduit of negligible resistance; an accumulator isincluded to smooth out the pulsations of the pump.A hydraulic load (modeled by a fluid resistance R) isconnected between the pipe and a reservoir (assumedat zero pressure). Sketch the motor-pump circuit.Derive the dynamic equations for the system, anddetermine the transfer function between motor voltageand the pressure across the load.
a 220V shunt generator has an armature resistance of 0.02ohms and a shunt field resistance of 44 ohms. at rate load, the driving engine develops 62.26 hp. If the iron and friction losses amount to 1600W, how much is the current delivered to the load at this condition? (Our subject is ELECTRICAL MACHINE 1, and our lesson is Losses an Efficiency in DC Machine) (I need clean solution ma'am/sir, thank you so much)
The armature and field resistances of a series machine are 0.2 ohm and 0.3 ohms respectively. While running as a generator, the generated emf is 250V at 1200rpm. If the machine is run as motor, it takes 4A at220V. At a certain load, the motor takes 30A at 220V. However, on load, the armature reaction weakens the field by 4%. Find the motor speed at this load.
A 220V shunt generator has an armature resistance of 0.02ohms and a shunt field resistance of 44ohms. at rate load, the driving engine develops 62.26hp. If the iron and friction losses amount to 1600W, how much is the current delivered to the load at this condition? (Our subject is ELECTRICAL MACHINE 1, and our lesson is Losses and Efficiency on the DC MACHINE) (I need a clean solution ma'am/sir. Thank you do much)
A shunt generator supply 100A at 200 V. The armature and shunt resistance are 0.025 and 100 ohms respectively. If the copper losses are equal to the iron losses at this load. Find the HP of engine driving the generator. (Our subject is ELECTRICAL MACHINE 1, and our lesson is Losses and Efficiency on the DC MACHINE)
An electric motor draws a current of 10 amperes with a voltage of 110 V. The output shaft develops a torque of 10.2 N-m and a rotational speed of 1000 rpm. For operation at steady state, determine:a. The electric power required by the motor and the power developed by the output shaft, each in kWb. The net power input to the motor, in kWc. The amount of energy transferred to the motor by electrical work and the amount of energy transferred out of the motor by the shaft, in kW-hr during 2 hours of operation.
A d.c. shunt machine has armature and field resistances of 0.025 Ω and 80 Ω respectively. When connected to constant 400-V bus-bars and driven as a generator at 450 r.p.m., it delivers 120 kW. Calculate its speed when running as a motor and absorbing 120 kW from the same bus-bars
Find the speed and torque at the steady-state for the drive has the following parameters: Electric Motor: A 220 V, 13 A and Kϕ=2.5 (V. sec) DC separately excited motor has Ra= 0.8 Ω , and Rf=Rf= 10 Ω . Conveyors: TL=175 TL=175 N.m Find the steady-state operating point, the speed(N) and torque(T). Determine the steady-state for the equilibrium point.
The following test data are taken from 60kW, eight pole, 400 V, 50 Hz, class C, junction IM.DC Test: RDC = 0.152Ω Idle test:VNL = 400 , V f = 50 Hz , INL = 30 A ,PNL = 3400 W Locked-rotor TestVBR = 80 , Vf = 12.5 Hz IBR = 120 A ,PBR = 6500 W a) Find the velocities of the stator and rotor magnetic field? b) Find the value of smax and Tmax? c) Input current I1 and Input power Pin? d) Air gap power PAG and Rotor copper losses PRCL? e) Ind. Mek. Power Pconv and Output power Pout? f) Tconv the generated moment, Tout the spindle moment, and the efficiency of the motor ɳ? g) Find the value of smax and Tmax? h) Find the circuit parameters? i) Draw the per phase equivalent circuit of this motor?
Electrical Engineering Dep. Electrical Machine Lab. NO LOAD CHARACTERISTIC OF DC MOTORS DISCUSSION 1- Comment on the curves obtained . 2- What are the types of the losses in the DC machines?
a dc shunt generator supplies a load of 10kW at 250V calculate the induced emf,if the armature resistance is o.5ohm and the shunt field resistance is 100ohm
A 4-pole, lap-wound dc machine has 738 armature conductors. Its field winding is excited from a dc source to create an air-gap flux of 27 mWb/pole. The machine (generator) is run from a primemover (diesel engine) at 1200 rpm. It supplies a current of 80 A to an electric load. (a) Calculate the electromagnetic power developed. (b) What is the mechanical power that is fed from the primemover to the generator?