Electrical Machines Voltage Regulation Transformer Online Exam Quiz
Electrical Machines Voltage Regulation Transformer GK Quiz. Question and Answers related to Electrical Machines Voltage Regulation Transformer. MCQ (Multiple Choice Questions with answers about Electrical Machines Voltage Regulation Transformer
The voltage regulation for transformer is given by ___________
Options
A : (E2-V2)/E2
B : (E2-V2)/V2
C : (V2-E2)/E2
D : (V2-E2)/V2
If the per unit leakage impedance for the primary of a transformer is ‘x’ on the given rated base value. If the voltage and volt-amperes are doubled, then the changed per unit impedance will be ___________
Options
A : 0.5x
B : 2x
C : 4x
D : x
If the per unit leakage impedance for the primary of a transformer is ‘x’ on the given rated base value. If the voltage and volt-amperes are halved, then the changed per unit impedance will be ___________
Options
A : 0.5x
B : 2x
C : 4x
D : x
If the pu impedance of a single phase transformer is 0.01+j0.05, then its regulation at p.f. of 0.8 lagging will be?
Options
A : 3.8%
B : 2.2%
C : -3.8%
D : -2.2%
If the pu impedance of a single phase transformer is 0.01+j0.05, then its regulation at p.f. of 0.8 leading will be?
Options
A : 3.8%
B : 2.2%
C : -3.8%
D : -2.2%
A 10 kVA, 400/200 V, 1-phase transformer with 2% resistance and 2% leakage reactance. It draws steady short circuit current at which angle?
Options
A : 45°
B : 75°
C : 135°
D : 0°
A 200/400 V single phase transformer has leakage impedance z= r+jx. Then we can expect magnitude of load pf of ____ at zero voltage regulation.
Options
A : cos? = x/z
B : cos? = r/z
C : cos? = x/r
D : cos? = r/x
While conducting testing on the single phase transformer, one of the student tries to measure the resistance by putting an ammeter across one terminal of primary and other to secondary, the reading obtained will be ___________
Options
A : infinite
B : zero
C : finite
D : negative finite
While conducting open circuit test and short circuit test on a transformer, status of low-voltage and high-voltage windings will be such that in ____________
Options
A : OC test – h.v. open, SC test-l.v. short-circuited
B : OC test – l.v. open, SC test-h.v. short-circuited
C : OC test – l.v. open, SC test-l.v. short-circuited
D : OC test – h.v. open, SC test-h.v. short-circuited
While estimating voltage regulation of a transformer, keeping ___________
Options
A : primary voltage constant
B : secondary voltage constant
C : voltage changes constant at primary
D : all of the mentioned
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