Basic Electrical MCQ

Question 1: A current is said to be alternating when it changes in?

Answers: Both Magnitude & Direction

Question 2: If 2 sinusoidal of the same frequency but of different amplitudes and phase difference are added, the resultant is a?

Answers: Sinusoid of the same Frequency

Question 3:A 240V single-phase ac source is connected to a load with an impedance of 10 2. A capacitor is connected in parallel with the load. If the capacitor supplies 1,250 VAR, the Real power supplied by the source is:

Answers: 2,880 Watts

Question 4:A source of angular frequency 1 rad/sec has a source impedance consisting of 1 resistance in series with 1H inductance. The load that will obtain the maximum power transfer is?

Answers: 12 Resistance in series with 1F capacitor

Question 5: The rated voltage of a 3-phase power system is given as?

Answers: RMS Line-to-Line Voltage

Question 6: For a 3-phase Load balanced condition, each phase has the same value of?

Answers: All of these

Question 7: A 3-phase Delta-connected symmetrical load consumes P watts of power from a balanced supply. If the same load is connected in star to the same supply, then what is the power consumption?

Answers: P/3

Question 8: 2 resistors of equal values are connected series across the lines B and C of a symmetrical 3-phase, 400V system. What is the magnitude of the voltage between the line A and the junction of resistors?

Answers: 200/3

Question 9: If a load is purely inductive and the reactive power is 12 VAR, the apparent power is?

Answers: 12VA

Answers: 17.49V