Skin effect occurs when a conductor carries current at_______ frequencies
Skin effect occurs when a conductor carries current at_______ frequencies
A. very low
B. low
C. medium
D. high
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Wire-wound resistors are unsuitable for use at high frequencies because they_______?
Wire-wound resistors are unsuitable for use at high frequencies because they_______?A. create more electrical noise
B. are likely to melt under excessive eddy current heat
C. consume more power
D. exhibit unwanted inductive and capacitive effectsWhen an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?
When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?A. apparent power
B. true power
C. reactive power
D. none of the aboveA pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?A. the capacitive reactance in ohms
B. the current flowing in capacitor
C. the size of the capacitor being quite big
D. the statement is incorrectThe product of apparent power and cosine of the phase angle between circuit voltage and current is
The product of apparent power and cosine of the phase angle between circuit voltage and current isA. true power
B. reactive power
C. volt-amperes
D. instantaneous powerFor a sine wave with peak value Imax the r.m.s. value is_______?
For a sine wave with peak value Imax the r.m.s. value is_______?A. 0.5 Imax
B. 0.707
C. 0.9
D. 1.414 LmaxThe r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?
The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?A. 282.8 V
B. 141.4 V
C. 111 V
D. 100 V