Objective DC Generators Questions – Electrical Engineering (Page 5)

#81📘 EE Pocket Reviewer RojasEasy

What is the purpose of using compensating windings in dc generators?

ATo neutralize the armature reaction

BTo reduce the eddy current loss

CTo provide path for circulating air

DTo decrease the reluctance of the magnetic path

#82📘 EE Pocket Reviewer RojasEasy

What is the voltage regulation of an overcompounded dc generator?

APositive

BNegative

CAlmost zero

DVery high

#83📘 EE Pocket Reviewer RojasEasy

Which of the following is used to connect the commutator segments to the armature conductors?

ABy brazing

BBy copper lugs

CBy insulation pads

DBy resistance wires

#84📘 EE Pocket Reviewer RojasEasy

Which dc generators has the poorest voltage regulation?

ASeries generator

BShunt generator

CLong shunt compound generator

DShort shunt compound generator

#85📘 EE Pocket Reviewer RojasEasy

Which of the following would cause sparking at the brushes in a dc generator?

AHigh mica

BDirty commutator

CGrooved commutator

DAll of these

#86📘 EE Pocket Reviewer RojasEasy

Which of the following is an essential requirement for stable parallel operation of dc generators?

ASame percentage regulation

BDrooping voltage characteristics

CSame kW output ratings

DSame no-load to full load speeds

#87📘 EE Pocket Reviewer RojasEasy

How do you call a compound generator that has a voltage rise from no-load to full load?

AFlat compounded

BUnder compounded

COver compounded

DUnder-flat compounded

#88📘 EE Pocket Reviewer RojasEasy

What is the output of a single loop dc generator?

ASteady ac

BSteady dc

CPulsating ac

DPulsating dc

#89📘 EE Pocket Reviewer RojasEasy

In a dc machine, the biggest eddy current loss occurs where?

AField poles

BYoke

CArmature core

DCommutating poles

#90📘 EE Pocket Reviewer RojasEasy

Which of the following load characteristics is a good application of a shunt generator?

AConstant voltage over a wide range of load

BConstant voltage over a narrow range of load

CConstant current over a wide range of load

DConstant current over a narrow-range of load

#91📘 EE Pocket Reviewer RojasEasy

How can the ripples of output voltage in a dc generator be reduced?

AUse commutator with more segments

BUse bigger size of armature conductors

CUse more brushes

DUse equalizer rings

#92📘 EE Pocket Reviewer RojasEasy

How does a compensating winding be connected in a dc generator?

AIn series with the field windings

BIn parallel with the field windings

CIn parallel with the armature windings

DIn series with the armature windings

#93📘 EE Pocket Reviewer RojasEasy

What is the insulating medium used between commutator segments?

AMica

BGraphite

CPaper

DVarnish

#94📘 EE Pocket Reviewer RojasEasy

How much is the commutator pitch for a simplex wave winding?

AEqual to 1

BEqual to the pole pitch

CEqual to half the pole pitch

DEqual to twice the pole pitch

#95📘 EE Pocket Reviewer RojasEasy

Which of the following would cause one bar of a commutator segment to blacken?

AA shorted coil

BAn open coil

CA grounded coil

DA loose brush connection

#96📘 EE Pocket Reviewer RojasEasy

Which of the following type of brushes has the least voltage drop?

AGraphite brush

BCarbon brush

CCast iron brush

DMetal graphite brush

#97📘 EE Pocket Reviewer RojasEasy

What is the emf induced in a conductor rotating in a bipolar field?

ADC

BAC

CBoth DC and AC

DNone of these

#98📘 EE Pocket Reviewer RojasEasy

High mica between commutator bars is removed by which of the following?

AHot air blowing

BChiseling

CUndercutting

DWiping with a clean cloth

#99📘 EE Pocket Reviewer RojasEasy

How do you call the resistance of the windings of a generator?

AInternal resistance

BInduced resistance

CCritical resistance

DTerminal resistance

#100📘 EE Pocket Reviewer RojasEasy

What is the simplest way to shift load from one dc shunt generator running in parallel with another?

AUse equalizer connections

BAdjust their field rheostat

CInsert resistance in their armature circuit

DAdjust the speed of their prime movers

More Electrical Engineering topics