ECAT Pre General Science Chapter 16 online mcq test with answers for Physics chapter 16 (Alternating Current)

ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test

Sr. #	Questions	Answers Choice
1	The impedance of RLC series resonance circuit at resonant frequency is	Greater than R Equal to R Less than R None of these
2	An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is	3525.0 volts 35.35 volts 353.5 volts 3.535 volts
3	To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance	5.07 pF 50 pF 0.507 pF 507 pF
4	At resonance, the impedance of RLC series circuit is	Maximum Zero Minimum Determinate
5	When either L or C is increased, the resonant frequency of the RLC series circuit	Increases Decreases Remains the same Becomes zero
6	At resonance, the phase angle for RLC series resonance circuit equals	0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 270<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
7	The power factor of resonant series circuit is	1 0 -1 0.5
8	In RLC series circuit, resonance occurs when	X<sub>L > Xc</sub> X<sub>L < Xc</sub> X<sub>L = Xc</sub> None of these
9	A resonance curve for RLC series circuit is a plot of frequency versus	Voltage Current Impedance Reactance
10	The r.m.s. value of alternating current is equal to its maximum value at angle of	60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 45<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 30<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
11	The device which allows only the flow of an A.C. through a circuit is	Capacitor Inductor D.C. motor Battery
12	Alternating current can induce voltage because it has a	High peak value Varying magnetic field Stronger field than direct curren Constant magnetic field
13	An A.C varies as a function of	Current Voltage Time Charge
14	At higher frequency of the alternating current, the capacitive reactance X_c	Increases Decreases Remains the same Increases only when the voltage increases
15	Which one of the following is correct?	V<sub>o</sub>= 1.414 V<sub>rms</sub> I<sub>ams</sub>= 1.414 I<sub>o</sub> VO = 10.70 Vrms Both a and b
16	In an A.C circuit with resistor only, the current and voltage have a phase angle of	90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> none of these
17	The basic circuit elements of A.C circuit are	Resistor Inductor Capacitor All the three
18	During each cycle, alternating voltage reaches a peak value	One time Two times Four times A number of times depending on the frequency
19	The average of A.C. current and voltage over a complete cycle is	Maximum zero Neither zero nor maximum None of these

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