Dc Machines Efficiency Dc Machine 1 Online Exam Quiz
Dc Machines Efficiency Dc Machine 1 GK Quiz. Question and Answers related to Dc Machines Efficiency Dc Machine 1. MCQ (Multiple Choice Questions with answers about Dc Machines Efficiency Dc Machine 1
The total losses in a well-designed DC generator of 10 kW will be nearly equal to ________
Options
A : 100 W
B : 500 W
C : 1000 W
D : 1500 W
The efficiency of the DC motor at maximum power will be ___________________
Options
A : 100%
B : Around 90%
C : Anywhere between 75% and 90%
D : Less than 50%
Which of the following loss in a DC generator varies significantly with the load current?
Options
A : Field copper loss
B : Windage loss
C : Armature copper loss
D : Cannot be determined
The hysteresis loss in a DC machine least depends on _____________
Options
A : Frequency of magnetic reversals
B : Maximum value of flux density
C : Volume and grade of iron
D : Rate of flow of ventilating air
Which of the following loss is likely to have highest proportion at rated load of the DC generator?
Options
A : Hysteresis loss
B : Field copper loss
C : Armature copper loss
D : Eddy current loss
Which of the following losses are significantly reduced by laminating the core of a DC generator?
Options
A : Hysteresis losses
B : Eddy current losses
C : Copper losses
D : Windage losses
Which of the following is not the effect of iron loss?
Options
A : Loss of efficiency
B : Excessive heating of core
C : Increase in terminal voltage
D : Rise in temperature of ventilating air
Which of the following loss/losses in a DC generator is dissipated in the form of heat?
Options
A : Mechanical loss
B : Core loss
C : Copper loss
D : Mechanical, Copper and Core
Which of the following methods is likely to result in reduction of hysteresis loss in a DC generator?
Options
A : Providing laminations in armature core
B : Providing laminations in stator
C : Using non-magnetic material for frame
D : Using material of low hysteresis co-efficient for armature core material
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