Electrical Engineering Questions and Answers
51. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
300 AT
52. The direction of a magnetic field within a magnet is from south to......
north
53. what you mran by retentivity
The ability of a material to remain magnetized after removal of the magnetizing force
54. If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage.....
increases
55. The induced voltage across a stationary conductor in a stationary magnetic field is.....
zero
56. A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is....
5
57. How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
90 V
58. The primary winding of a power transformer should always be.....
fused
59. The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?
880 V
60. A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is.....
1.7 V
61. mica or glass has the highest dielectric constant?
glass
62. paper or glass has the highest dielectric constant?
glass
63. When the plate area of a capacitor increases....... increases
capacitance
64.When the voltage across a capacitor is tripled, the stored charge triples - true or false?
true
65. Resistance is measured in......
ohms
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