# EE SHORT NOTES-A.C. FUNDAMENTALS 2

 21 A sine wave of voltage varies from zero to maximum of 200 V. How much is the voltage at the instant of 30° of the cycle ? 100V [other wrong options are – 50V, 82.8V, 173.2 V, ]

 22 The power consumed in a circuit element will be least when the phase difference between the current and voltage 90° [other wrong options are – 180°, 60°, 0°, ]
 23 The form factor is the ratio of r.m.s. value to average value [other wrong options are – Peak value to r.m.s. value, Average value to r.m.s. value, None of these, ]
 24 Which of the following is not a non-linear element ? Heater coil [other wrong options are – Transistor, Diode, Electric arc with unlike electrodes, ]
 25 At half power points of a resonance curve, the current is____ times the maximum current. 1/ √2 [other wrong options are – 1/2, √2, 2, ]
 26 The product of apparent power and cosine of the phase angle between circuit voltage and current is True power [other wrong options are – Reactive power, Volt-amperes, Instantaneous power, ]
 27 The power is measured in terms of decibles in case of Electronic equipment [other wrong options are – Transformers, Current transformers, Auto-transformers, ]
 28 The safest value of current the human body can carry for more than 3 second is 9 mA [other wrong options are – 4 mA, 15 mA, 25 mA, ]
 29 The power factor at resonance in RLC parallel circuit is Unity [other wrong options are – Zero, 0.08 Lagging, 0.8 Leading, ]
 30 Capacitors for power factor correction are rated in kVAR [other wrong options are – kW, kVA, kV, ]
 31 For 200 V r.m.s. value triangular wave, the peak voltage will be 346 V [other wrong options are – 200 V, 222 V, 282 V, ]
 32 Two waves of the same frequency have opposite phase when the phase angle between them is 180° [other wrong options are – 360°, 90°, 0°, ]
 33 A network is said to be non-linear if it does not satisfy Both (A) and (B) [other wrong options are – Homogeneity condition, Superposition condition, Associative condition, ]
 34 The value of operator j2 is equal to  -1 [other wrong options are – Zero,  +1, √-1, ]
 35 The power factor of a D.C. circuit is always Unity [other wrong options are – Less than unity, Greater than Unity, Zero, ]
 36 At____ frequencies the parallel R-L circuit behaves as purely resistive. Very high [other wrong options are – Low, Very low, High, ]
 37 If resistance is 20 ω and inductance is 2H in a RL series circuit, then time constant of this circuit will be 0.1 S [other wrong options are – 0.001 S, 10 S, 100 S, ]
 38 The transient currents are associated with the Changes in the stored energy in the inductors and capacitors [other wrong options are – Impedance of the current, Applied voltage to the circuit, Resistance of the circuit, ]
 39 The best place to install a capacitor is Across the terminals of the inductive load [other wrong options are – Very near to inductive load, Far away from the inductive load, Any where, ]
 40 For a sine wave with peak value Emax the average value is 0.636 Emax [other wrong options are – 0.707 Emax, 0.434 Emax, 1.414 Emax, ]