Dc Machines Characteristics Self Excited Generator Online Exam Quiz
Dc Machines Characteristics Self Excited Generator GK Quiz. Question and Answers related to Dc Machines Characteristics Self Excited Generator. MCQ (Multiple Choice Questions with answers about Dc Machines Characteristics Self Excited Generator
Machine does not excite to an appreciable value when ___________
Options
A : Field resistance is less than critical resistance
B : Field resistance is more than critical resistance
C : In both cases a and b
D : Depends on other parameters
No-load voltage can’t be defined where _____________
Options
A : Field resistance line lies below the magnetization linear line
B : Field resistance line intersects the magnetization linear line
C : Field resistance line coincides the magnetization linear line
D : Defined everywhere
What is Self-excitation in DC shunt generator?
Options
A : Field winding is connected in series of armature
B : Field winding is connected in parallel of armature
C : Field winding is not connected to the armature
D : Field Winding is not excited
For a self-excited DC shunt generator Ia = _____________
Options
A : IL – If
B : IL + IL
C : – IL – IL
D : – IL + IL
Which of the following will be useful to generate positive feedback?
Options
A : Increasing the field resistance
B : Increasing the armature resistance
C : Decreasing the armature resistance
D : Changing the shaft direction
No-load voltage observed at two different field resistance values, is V1 < V2. What will be the relation in speed if field resistance is kept same for both cases?
Options
A : N1 < N2
B : N1 = N1
C : N1 > N1
D : Can’t determine from no-load voltage
Intersection of Rf line and magnetization curve will give _____________
Options
A : No load terminal voltage
B : Field current at no load
C : Both a and b
D : Not specific data
What will happen if field resistance is decreased?
Options
A : No load voltage will decrease
B : No load voltage will increase
C : No change in no load voltage
D : Field current will decrease
DC generator will not self-excite in __________
Options
A : Positive feedback
B : Negative feedback
C : Zero Feedback
D : Doesn’t depend on feedback
Which of the following is not a reason, behind failing of self-exciting machine?
Options
A : Residual magnetism is absent
B : Negative feedback
C : Field resistance value is more than critical resistance value
D : Armature resistance is non-zero
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