A synchronous motor runs at 600rpm, which of the following case is true? P = 8, f = 50 Hz P = 12, f = 60 Hz P= 12, f = 50 Hz P = 10, f = 60 Hz TRUE ANSWER : ? YOUR ANSWER : ?
A single-phase circuit’s power factor can be measured with a/an Combination of a voltmeter, ammeter, and wattmeter Combination of a voltmeter and ammeter Wattmeter alone Energy meter alone TRUE ANSWER : ? YOUR ANSWER : ?
Find H = _____ A/m at the center of a circular coil of diameter 1 m and carrying a current of 2A 1 A/m 8 A/m 2 A/m 4 A/m TRUE ANSWER : ? YOUR ANSWER : ?
Two inductors of 4H and 6H are connected in series. The equivalent inductance of this combination is 6 H 2.4 H 10 H 4 H TRUE ANSWER : ? YOUR ANSWER : ?
H = ____is the expression for the magnetic field due to an infinite linear current-carrying conductor (I ⁄ 2r) A/m (μI ⁄ 2Πr) A/m (I ⁄ 2Πr) A/m (μI ⁄ 2r) A/m TRUE ANSWER : ? YOUR ANSWER : ?
For a three-layer stranded wire, the number of strands in the first, second, and third layer respectively are: 1, 6 and 12 1, 4 and 8 1, 7 and 14 1, 5 and 10 TRUE ANSWER : ? YOUR ANSWER : ?
If the copper loss of a transformer at half full load is 400 W, then the copper loss corresponding to full load is 400 W 800 W 1600 W 1200 W TRUE ANSWER : ? YOUR ANSWER : ?
Find the net capacitance of the combination in which ten capacitors of 10 μF are connected in parallel 0.1 μF 100 μF 1 μF 50 μF TRUE ANSWER : ? YOUR ANSWER : ?
In the circuit shown, if R = 0, then the phase angle between v(t) and i(t) is<br/> 90° 60° 0° 30° TRUE ANSWER : ? YOUR ANSWER : ?