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Ac fundamentals
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The dual of a link is Tree branch [other wrong options] [Discuss in forum] Twig Node Loop |
Q22 ⇒ The form factor of D.C. supply voltage is
always Unity [other wrong options] [Discuss in forum] Zero 0.5 Infinite |
Q23 ⇒ A heater is rated as 230 V, 10 KW, AC. The
value 230 V refers t r.m.s. voltage [other wrong options] [Discuss in forum] Average voltage Peak voltage None of these |
Q24 ⇒ For a sine wave with peak value Imax the
r.m.s. value is 0.707 Imax [other wrong options] [Discuss in forum] 0.5 Imax 0.9 Imax 1.414 Imax |
Q25 ⇒ The r.m.s. value of a sinusoidal A.C. current
is equal to its value at an angle of____
degrees 45 [other wrong options] [Discuss in forum] 90 60 30 |
Q26 ⇒ Power factor of the following circuit will be
unity Resistance [other wrong options] [Discuss in forum] Inductance Capacitance Both (A) and (B) |
Q27 ⇒ Power factor of electric bulb is Unity [other wrong options] [Discuss in forum] Zero Lagging Leading |
Q28 ⇒ In a parallel R-C circuit, the current always
____the applied voltage. Leads [other wrong options] [Discuss in forum] Lags Remains in phase with None of the above |
Q29 ⇒ The negative maximum of a cosine wave
occurs at 180 [other wrong options] [Discuss in forum] 30 45 90 |
Q30 ⇒ In an A.C. circuit I sin Φ is called Wattless component [other wrong options] [Discuss in forum] Active component Any of the above None of these |
Q31 ⇒ A parallel resonant circuit can be used Both (A) and (B) [other wrong options] [Discuss in forum] As a high impedance To reject a small band of frequencies To amplify certain frequencies |
Q32 ⇒ The reflection co-efficient of the simplest standing wave is 1 [other wrong options] [Discuss in forum] +1 Zero Infinity |
Q33 ⇒ Form factor is the ratio of r.m.s. value/average value [other wrong options] [Discuss in forum] Average value/r.m.s. value Average value/peak value r.m.s. value/peak value |
Q34 ⇒ In the R - L - C containing R = 4.5ω L =
0.06 H,C = 0.6 µF the power factor will be Leading [other wrong options] [Discuss in forum] Zero Lagging Unity |
Q35 ⇒ In a R-L-C series circuit if voltage V across
the circuit is reduced to half the current I will
change to I/2 [other wrong options] [Discuss in forum] 2 I 3/4 I 5/8 I |
Q36 ⇒ At very low frequencies a series R-C circuit
behaves as almost purely____ Capacitive [other wrong options] [Discuss in forum] Resistive Inductive None of these |
Q37 ⇒ The r.m.s. value of pure cosine function is 0.707 of peak value [other wrong options] [Discuss in forum] 0.5 of peak value Same as peak value Zero |
Q38 ⇒ In A.C. circuit the power curve is a sine wave
having Double the frequency of voltage [other wrong options] [Discuss in forum] Same frequency as that of voltage Half the frequency of the voltage None of these |
Q39 ⇒ The ratio of the bandwidth to the resonance
frequency is called the____ of the circuit. Selectivity [other wrong options] [Discuss in forum] Impedance Susceptance Quality factor |
Q40 ⇒ The shunt element in a band pass filter is Parallel combination of L and C [other wrong options] [Discuss in forum] Capacitive Inductive Series combination of L and C |
Or |