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Electrical engineering
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( 1 ) With some initial change at t = 0+, a capacitot will act as
- 1) short circuit.
- 2) open circuit.
- 3) a voltage source.
- 4) a current source.
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Show Answer Report Discussion in forumAnswer : 3) a voltage source.
Solution : At t = 0+, the capacitor starts charging to a particular voltage and acts as a voltage source.
discussion
Answer : 3) a voltage source.
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( 2 ) If a circuit does not contain any source of energy or emf, it is known as
- 1) unilateral circuit.
- 2) bilateral circuit.
- 3) active network.
- 4) passive network.
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Show Answer Report Discussion in forumAnswer : 4) passive network.
Solution : When a network does not contain any source of e.m.f., it is called passive network. A passive network consists of resistance, inductance or capacitance as passive element. A passive network does not contains any source of energy and the input port serve as load terminal. It may have output terminal.
discussion
Answer : 4) passive network.
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( 3 ) Active element of electrical circuit is
- 1) voltage source.
- 2) current source.
- 3) both 1 & 2
- 4) none of these.
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Show Answer Report Discussion in forumAnswer : 3) both 1 & 2
Solution : Active elements or sources - these are elements which can source electrical power; examples are voltage sources and current sources. They can be used to represent ideal batteries and power supplies
discussion
Answer : 3) both 1 & 2
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( 4 ) The basic circuit elements are
- 1) R, L and C.
- 2) Vs, Is.
- 3) both 1 & 2
- 4) none of these.
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Show Answer Report Discussion in forumAnswer : 1) R, L and C.
Solution : Resistance R, measured in ohms - produces a voltage proportional to the current flowing through the element. Relates voltage and current according to the relation dV = RdI.
Capacitance C, measured in farads - produces a current proportional to the rate of change of voltage across the element. Relates charge and voltage according to the relation dQ = CdV.
Inductance L, measured in henries - produces the magnetic flux proportional to the rate of change of current through the element. Relates flux and current according to the relation dφ = LdI
discussion
Answer : 1) R, L and C.
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( 5 ) The linear circuit element is
- 1) capacitor.
- 2) inductor.
- 3) resistor.
- 4) all of above.
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Show Answer Report Discussion in forumAnswer : 3) resistor.
Solution : The linear circuit element is resistor.
discussion
Answer : 3) resistor.
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( 6 ) Clamping circuits are one which inserts
- 1) AC component in signal.
- 2) DC component in signal.
- 3) both AC and DC.
- 4) none of these.
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Show Answer Report Discussion in forumAnswer : 2) DC component in signal.
Solution : Clamping circuits are one which inserts DC component in signal.
discussion
Answer : 2) DC component in signal.
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( 7 ) A certain AC circuit has resistance of 10 Ω and impedance of 20 Ω. The phase angle of voltage and current of the circuit is
- 1) 60°.
- 2) 30°.
- 3) 90°.
- 4) 45°
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Show Answer Report Discussion in forumAnswer : 1) 60°.
Solution : A certain AC circuit has resistance of 10 Ω and impedance of 20 Ω. The phase angle of voltage and current of the circuit is 60°.
discussion
Answer : 1) 60°.
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( 8 ) An electrical circuit with 10 branches and 7 nodes will have
- 1) 10 loop equations.
- 2) 7 loop equations
- 3) 3 loop equations.
- 4) 4 loop equations.
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Show Answer Report Discussion in forumAnswer : 4) 4 loop equations.
Solution : An electrical circuit with 10 branches and 7 nodes will have 4 loop equations.
discussion
Answer : 4) 4 loop equations.
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( 9 ) Current is measured by a(n) __________.
- 1) voltmeter
- 2) ammeter
- 3) ohmmeter
- 4) electrometer
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Show Answer Report Discussion in forumAnswer : 2) ammeter
Solution : Current is measured by a(n) ammeter.
discussion
Answer : 2) ammeter
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( 10 ) What is the purpose of differential amplifier stage in internal circuit of Op-amp?
- 1) Low gain to differential mode signal
- 2) Cancel difference mode signal
- 3) Low gain to common mode signal
- 4) Cancel common mode signal
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Show Answer Report Discussion in forumAnswer : 4) Cancel common mode signal
Solution : Cancel common mode signal
discussion
Answer : 4) Cancel common mode signal
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