Electrical Machines Autotransformers Online Exam Quiz
Electrical Machines Autotransformers GK Quiz. Question and Answers related to Electrical Machines Autotransformers. MCQ (Multiple Choice Questions with answers about Electrical Machines Autotransformers
If a transformer is at no load, then it will act like __________
Options
A : a resistor at p.f = 0
B : an inductive reactor at 0.2 lagging
C : a capacitive reactor at0.2 leading
D : an inductive reactor at 0.8 lagging
When a transformer winding suffers a short circuit, then inter turns of the same winding experience ______ forces.
Options
A : an attractive
B : a repulsive
C : no force
D : may be attractive or repulsive type
Maximum efficiency of a transformer for a constant load current, occurs at __________
Options
A : at any p.f
B : zero p.f leading
C : zero p.f lagging
D : unity p.f
While comparing potential transformer to an auto transformer, a potential transformer transfers power ________
Options
A : conductively
B : inductively
C : both conductively as well as inductively
D : electromagnetic induction
A 1-phase tranformer has a leakage impedance of 1+ j4 ? for primary and 3+ j11 ? for secondary windings. This transformer has __________
Options
A : H.V primary
B : Medium voltage primary
C : L.V primary
D : L.V secondary
The tappings on the transformers is provided on __________
Options
A : h.v side at one end of the winding
B : l.v. side at one end of the winding
C : h.v side at middle
D : l.v side at middle
Two tranformer having same voltage but different KVA are operating in parallel. For a good load sharing __________
Options
A : impedance must be equal
B : pu impedances must be equal
C : pu impedance and X/R ratios must be equal
D : impedance and X/R ratios must be equal
In a transformer, we place the tapping windings at the middle because __________
Options
A : of radial forces on the windings
B : axial forces on the windings
C : insulation level of the winding
D : to provide a mechanical balance to the windings
The voltage regulation of a transformer at full-load 0.8 p.f leading is -2%. Its voltage regulation at full load 0.8 p.f lagging _____________
Options
A : will be positive
B : will be negative
C : may be positive
D : may be negative
Three transformers having identical dimensions but with core of iron, aluminium and wood are wound with same number of turns and have same supply. Then choose the order for eddy current losses.
Options
A : wood > aluminium > iron
B : aluminium > iron > wood
C : iron > wood > aluminium
D : iron > aluminium > wood
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