Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Chock consumes externally small Charge Current Power Potential
2 Which one of the following waves belongs to electromagnetic spectrum Radio and TV waves Radar waves Micro waves All of them
3 In frequency modulation (FM), the carrier waves amplitude Remains constant Increase Decreases None of these
4 If the value of C in a series RLC circuit is increased, the resonant frequency Is not affected Increase Remains the same Decreases
5 The phase angle of a series RLC circuit at resonance is 180<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> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> None of the these
6 The total reactance of a series RLC circuit at resonance is zero Equal to the resistance Infinity Capacitive
7 SI unit of impedance is hertz henry ampere ohms
8 In series RC circuit when R=Xc, then the phase angle is 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> 70<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>
9 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current Decreases Increases Does not change Momentarily goes to zero
10 At resonance frequency the impedance of parallel resonance circuit is Maximum Minimum Zero None of the above
11 The impedance of RLC series resonance circuit at resonant frequency is Greater than R Equal to R Less than R None of these
12 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
13 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
14 At resonance, the impedance of RLC series circuit is Maximum Zero Minimum Determinate
15 When either L or C is increased, the resonant frequency of the RLC series circuit Increases Decreases Remains the same Becomes zero
16 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>
17 The power factor of resonant series circuit is 1 0 -1 0.5
18 In RLC series circuit, resonance occurs when X<sub>L &gt; Xc</sub> X<sub>L &lt; Xc</sub> X<sub>L = Xc</sub> None of these
19 A resonance curve for RLC series circuit is a plot of frequency versus Voltage Current Impedance Reactance
20 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>
21 The device which allows only the flow of an A.C. through a circuit is Capacitor Inductor D.C. motor Battery
22 Alternating current can induce voltage because it has a High peak value Varying magnetic field Stronger field than direct curren Constant magnetic field
23 An A.C varies as a function of Current Voltage Time Charge
24 At higher frequency of the alternating current, the capacitive reactance Xc Increases Decreases Remains the same Increases only when the voltage increases
25 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
26 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
27 The basic circuit elements of A.C circuit are Resistor Inductor Capacitor All the three
28 During each cycle, alternating voltage reaches a peak value One time Two times Four times A number of times depending on the frequency
29 The average of A.C. current and voltage over a complete cycle is Maximum zero Neither zero nor maximum None of these
30 Carnot heat engine only used isothermal processes adiabatic processes both of them none of them
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