1000+ ECE Viva Questions and Answers Pdf - 1
Question: 1
Measurement of power factor of a 3-phase system by two wattmeter method can be obtained in case of
(A) balanced source with 3 phase, 4 wire balanced load
(B) balanced source with 3 phase, 3 wire unbalanced load
(C) balanced source with 3 phase, 3 wire unbalanced load
(D) balanced load and balanced source
Ans: D
balanced load and balanced source
Question: 2
A two terminal black box contains one of the R-L elements. When the black box is connected to a 220 V ac supply, the current through the source is 1. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 21. The element is
(A) a resistance
(B) it is not possible to determine the element
(C) a capacitance
(D) an inductance
Ans: D
an inductance
Question: 3
In a balanced three phase star connected system, the phase voltages
(A) lags the respective line voltage by 30°
(B) leads the respective line voltages by 30°
(C) are in phase with the respective line voltage
(D) leads the respective line voltage by 90°
Ans: A
lags the respective line voltage by 30°
Question: 4
Application of Thevenin’s theorem in a circuit results in
(A) a voltage source and an impedance in series
(B) a current source and an impedance parallel
(C) an ideal current source
(D) an ideal voltage source
Ans: A
a voltage source and an impedance in series
Question: 5
Which of the following quantities consists of SI units as WATT?
(A) power
(B) force
(C) current
(D) charge
Ans: D
charge
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