Electrical Machines Online Quiz Online Exam Quiz
Electrical Machines Online Quiz GK Quiz. Question and Answers related to Electrical Machines Online Quiz. MCQ (Multiple Choice Questions with answers about Electrical Machines Online Quiz
Field winding of a dc machine _________
Options
A : always absorbs power
B : absorbs real power at lagging load
C : delivers power while behaving as generator
D : always delivers power
The static excitations mainly comprises of _______
Options
A : brushless excitation system
B : thyrister based excitation system
C : synchronous motor excitation system
D : brushless and thyristor based excitation system
What are the main problems faced by conventional DC exciters?
Options
A : cooling and maintainance
B : wear and tear
C : additional parasitic losses
D : all of the mentioned
The pilot exciter in dc exciters is ________
Options
A : dc shunt generator feeding field winding of mains
B : universal motor
C : stepper motor feeding the field winding of mains
D : any of the mentioned
A 3 phase synchronous machine is _________ excited machine.
Options
A : doubly
B : single
C : two stage
D : feedback based
The main exciter used in DC excitation is ________
Options
A : field on stator
B : armature on stator
C : field on rotor
D : field on poles
The excitation system and speed of alternator has _______
Options
A : linear response
B : exponential response
C : rectangular hyperbola response
D : circular response
The brushless excitation and conventional DC excitation systems are comparable but one significant change is _______
Options
A : pilot exciter is brushless permanent magnet motor
B : three phase rectifier feeds directly to main exciter
C : a three phase rectifier is fed by main exciter
D : no direct rectification is provided to the pilot exciter
In large synchronous machine, field winding is placed on ______ and ac supply on ______
Options
A : rotor, stator
B : stator, rotor
C : armature, slots
D : pole shoes, stator
If the DC excitation is suddenly dropped to 0, the three phase alternator _________
Options
A : runs as motor
B : stops to zero speed in few seconds
C : continues to run as motor but at lower speed
D : no change in the operating conditions
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