15. An ideal d.c. generator is one that has ...........voltage regulation.(a)low.(b) zero.(c) positive.(d) negative.16. The mechanical power developed by the armature of a d.c. motor is equalto.......(a) armature current multiplied by back e.m.f.(b) power input minus losses.(c) power output multiplied by efficiency.(d) power output plus iron losses.17. Which of the following quantity maintains the same direction whether ad.c. machine runs as a generator or as a motor ?(a) induced e.m.f.(b) armature current.(c) field current.(d) supply current.18. The shaft torque of a d.c. motor is less than its armature torque because oflosses.(a) copper.(b) mechanical.(c) iron.(d) rotational.19. The current drawn by a 120 - V d.c. motor of armature resistance 0.5and back e.m.f. 110 V is.......... ampere.(a)20(b) 240(c) 220(d)520. The d.c. series motor should never be switched on at no load because(a) the field current is zero.(b) The machine does not pick up.(c) The speed becomes dangerously high.(d) It will take too long to accelerate.Q2. Correct the wrong sentence if you find it in only (20) of the following sentences:1) Copper loss affected by power factor.2) The transformer does not draw a current when its secondary is open.3) The transformer ratings gave in KVA.4) The core loss is not affected by the load.5) The transformer Can be used to transform direct voltage and direct. current.6) The frequency of the induced emf in the secondary winding of a transformer is the same asthat of the impressed voltage on the primary winding.7) In a transformer, the primary current is twice as much as the secondary current. is a step-uptransformer.

As per the policy we are supposed to answer only the first question. Please post the rest…

Answered: 15. An ideal d.c. generator is one that…

15. An ideal d.c. generator is one that has ...........voltage regulation. (a)low. (b) zero. (c) positive. (d) negative.

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 supplies a load of 27 kW at 210 V through the cables of resistance, R = 126 mΩ. If the field winding resistance, Rf = 62 Ω and the armature resistance, Ra = 35 mΩ, Determine (a) the terminal voltage, and (b) the E.m.f. generated in the armature. The terminal voltage is = The E.m.f generated in armature is =
Q/ dc shunt generator 4 pole with 500 condcutor , wave running at speed 1000 r.p.m the resistance of armature and field are 0.02 , 55 ohm and delivering load 43.12kwatt at terminal voltage 220 volt, the iron losses is 750 watt 1-Torque developed by the prime mover .........and The torque developed by the armature ........... when running at 1000 r.p.m * 2-The load current ,,,,,,,,,,,,when the speed drops to 800 r.p.m. if If is unchanged ? * 3-Output of the prime motor…….kwatt * 4-Mechanical , electrical and overall efficiency …….. * 5-Flux per pole is......... wb *
. When a self-excited compound DC generator supplies load, the terminal voltage is not the same as the generated emE Why? a) voltage drop across the armature resistance will reduce the voltage available at the load terminals b) where there is a series field, voltage drop across the series field resistance will reduce the voltage available at the load terminals c) both "a" and "b" d) neither "a" nor "b"
A 110V shunt generator has a full load current of 100A, shunt field resistance of 55 ohms and constant losses of 500W. If full load efficiency is 88%, find the armature resistance. Assuming voltage to be constant at 110V, calculate the efficiency at half load. Find the load current.
44 - A - the regulation curve of a DC generator shows the relation between what two factors? a) output voltage and load current, b) output voltage and field current, c)field current and load current, d) none B) If same DC generator ca be connected for either separate- or self-excitation, with of the two connections should be used to obtain the better voltage regulation? a) self-excited b) separately-excited C) How is the efficiency usually expressed? a) in waltts, b) in kilowatts-hours, c) in percentage, d) none
A 230 V dc machine has an emf constantand . The field is separatelyexcited and produces 0.01 Wb per pole. for all parts ofthe problem. (a) At what speed does the machine operate as adc generator with rated terminal voltage? (b) At what speeddoes the machine operate as a dc motor with rated terminalvoltage? (c) If an external resistance is added in serieswith the armature circuit, at what speed does the machineoperate as a dc motor with rated terminal voltage? (d) If themotor of part (b) is known to be supplying 10 HP to a coupledmechanical load, determine the rotational losses at the point ofoperation ***Any two branches please do not be late
With increasing load current, the output voltage of a separately-excited DC generator falls, which is a property of its load characteristics (decreasing load resistance). As the load current grows, what is the most appropriate solution or action you can take to counteract this voltage drop and keep the output voltage at a consistent level? Note: Please explain in no more than 60 words.
A 110-V shunt generator has a full load current of 100 A, shunt field resistance of 55 Ω and constant losses of 500 W. If F.L. efficiency is 88%, find armature resistance. Assuming voltage to be constant at 110 V, calculate the efficiency at half-F.L. and at 50% overload. Find the load current corresponding to maximum efficiency.
A short-shunt compound DC generator supplies a current of 100 A at 220 V. If the resistance of the shunt field is 50 ohms, of the series field 0.025 ohms, of the armature 0.05 ohm, the total brush drop is 2 V and the iron and friction losses amount to 1 kW, determine the following: The armature current, Amp The generated voltage, V The copper losses, W The output power of the prime mover, kW The generator efficiency, %
111/ The armature reaction of the DC generator reduces the generated EMF. Select one: True False
- A separately excited 4 - pole, 900 rpm wave wound dc generator has an induced emf of 240V at rated speed and rated field current. When connected to a load, the terminal voltage is observed to be 200V. If the armature resistance is 0.2 Ω and the flux per pole is 10 m Wb, compute the armature current and the number of conductors
22 The DC voltage is generated in the Armature winding of DC Generator. Select one: True False