Dc Machines Test Online Exam Quiz
Dc Machines Test GK Quiz. Question and Answers related to Dc Machines Test. MCQ (Multiple Choice Questions with answers about Dc Machines Test
For a DC series generator what is the condition for self-excitation?
Options
A : (Ra+Rse) > RC
B : (RSE+Rse+RL) < RC
C : (RSE+Rse+RL) > RC
D : (Rse+RL) > RC
For a given DC series generator with critical resistance equal to 100 ?, armature resistance is equal to 50 ?, and series field resistance is equal to 20 ?, is connected across load of 50 ?. What will be the load voltage?
Options
A : 20 kV
B : 0 V
C : 2 kV
D : Data insufficient
How compounding level in a compound machine is adjusted?
Options
A : By adding variable resistance in series with series field resistance
B : By adding variable resistance in parallel with series field resistance
C : By adding fixed resistance in parallel with series field resistance
D : By adding fixed resistance in series with series field resistance
Which of the following characteristic lies above of all others?
Options
A : Differential compound
B : Under compound
C : Level compound
D : Over compound
Characteristics of separately excited DC generator are drawn by keeping _____
Options
A : Field current and speed both constant
B : Field current and speed both variable
C : Field current constant and speed variable
D : Field current variable and speed constant
What is the reason behind dropping down of Ea with load?
Options
A : Field resistance
B : Load resistance
C : Internal factors
D : Armature reaction
Why differential compound generator is not used in practice?
Options
A : High cost
B : High maintenance
C : High drop down in voltage
D : Difficult construction
External characteristic differ from internal characteristic in DC series motor by ______
Options
A : Ia *(Ra + RSE)
B : Ia *Ra
C : Ia *RSE
D : If *RSE
External characteristic differ from an internal characteristic in separately excited DC generator by _________
Options
A : Ia *Ra
B : If *Ra
C : IL *RL
D : If *Rf
The variation in terminal voltage of DC shunt generator with respect to variation in separately excited DC generator is ___________
Options
A : Much rapid
B : Much slower
C : Remains constant
D : Can’t say
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