| 1. | In AC. circuits, laminated iron is invariably used in order to ? | |
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reduce eddy current loss
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increase beat radiation
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make assembly cheap and easier
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reduce circuit permeability
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Report Question| 2. | The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is ? | |
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4 kVAR
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6 kVAR
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8 kVAR
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16kVAR
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| 3. | What inductance will give the same reactance as a capacitor of 2 ? F when both are at 50 Hz ? | |
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5 H
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10 H
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15 H
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20 H
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| 4. | For a L- C parallel circuit at resonance, all the statements given below are correct except ? | |
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the line current is maximum at resonance
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the branch currents at resonance are equal
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the angle between the branch currents is 180º at resonance
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the admittance is minimum at resonance
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| 5. | The voltage applied across an R-L circuit is equal to ..... of Vr and VL ? | |
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phasor sum
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arithmetic sum
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sum of the squares
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algebraic sum
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| 6. | The series element in band pass filter is ? | |
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capacitive
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inductive
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parallel combination of inductance and capacitance
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series combination of inductance and capacitance
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| 7. | The dominant wave is characterised by ? | |
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highest cut off wave length
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lowest cut off wavelength
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lowest attenuation
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highest attenuation
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| 8. | A series resonant circuit is capacitive at f= 150 Hz. The circuit will be inductive somewhere at ? | |
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f greater than 150 Hz
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f less than 160 Hz
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f equal to 150 Hz by increasing the value of the resistance
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none of the above
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| 9. | In series as well as parallel resonant circuits, increasing the value of resistance would lead to ? | |
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decrease in bandwidth of both the circuits
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increase in bandwidth of both the circuits
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decrease in bandwidth in series circuit and increase in parallel circuit
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increase in bandwidth in series circuit and decrease in parallel circuit
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| 10. | ln a power system, reactive power is necessary for ? | |
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power transmission
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stabilising the voltage level
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counteracting the effect of reactance in the transmission system
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none of the above
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