The period of a sine wave is _____ seconds. Its frequency is
The period of a sine wave is _____ seconds. Its frequency is
A. 20 Hz
B. 30 Hz
C. 40 Hz
D. 50 Hz
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If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?A. 0.001 s
B. 0.1 s
C. 10 s
D. 100 sThe r.m.s. value of pure cosine function is_________?
The r.m.s. value of pure cosine function is_________?A. 0.5 of peak value
B. 0.707 of peak value
C. same as peak value
D. zeroA parallel AC. circuit in resonance will__________?
A parallel AC. circuit in resonance will__________?A. have a high voltage developed across each inductive and capacitive section
B. have a high impedance
C. act like a resistor of low value
D. have current in each section equal to the line currentThe frequency of domestic power supply in Pakistan is_________?
The frequency of domestic power supply in Pakistan is_________?A. 200 Hz
B. 100 Hz
C. 60 Hz
D. 50 HzThe equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?A. 60 sin 25 t
B. 60 sin 50 t
C. 84.84 sin 3141
D. 42.42 sin 314 tA heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?A. average voltage
B. r.m.s. voltage
C. peak voltage
D. none of the above