1. A practical current source can also be represented as ___________
a) a resistance in parallel with an ideal voltage source
b) a resistance in parallel with an ideal current source
c) a resistance in series with an ideal current source
d) none of the mentioned
Explanation: A practical current source could be represented with a resistor in parallel with an ideal current source.
2. A practical voltage source can also be represented as ___________
a) a resistance in series with an ideal current source
b) a resistance in series with an ideal voltage source
c) a resistance in parallel with an ideal voltage source
d) none of the mentioned
Explanation: A practical voltage source could be represented with a resistor in series with an ideal voltage source.
3. Constant voltage source is ___________
a) active and bilateral
b) passive and bilateral
c) active and unilateral
d) passive and unilateral
Explanation: Voltage source is an active element and is unilateral.
4. Which of the following is true about an ideal voltage source?
a) zero resistance
b) small emf
c) large emf
d) infinite resistance
Explanation: An ideal voltage source with zero internal resistance.
5. A dependent source ___________
a) may be a current source or a voltage source
b) is always a voltage source
c) is always a current source
d) none of the mentioned
Explanation: Dependent sources can either be current sources or voltage sources.
6. With some initial change at t = 0+, a capacitor will act as ___________
a) open circuit
b) short circuit
c) a current source
d) a voltage source
Explanation: At t=0+, the capacitor starts charging to a particular voltage and acts as a voltage source.
7. If a current source is to be neglected, the terminals across the source are ___________
a) replaced by a source resistance
b) open circuited
c) replaced by a capacitor
d) short circuited
Explanation: As the ideal current source has infinite resistance, it can be neglected by open circuiting the terminals.
8. A constant current source supplies a electric current of 200 mA to a load of 2kΩ. When the load changed to 100Ω, the load current will be ___________
a) 9mA
b) 4A
c) 700mA
d) 12A
Explanation: From Ohm’s law, resistance is inversely proportional to the current.
9. A voltage source having an open circuit voltage of 200 V and internal resistance of 50Ω is equivalent to a current source of ___________
a) 4A with 50Ω in parallel
b) 4A with 50Ω in series
c) 0.5A with 50Ω in parallel
d) none of the mentioned
Explanation: A voltage source with resistance in series can be replaced with a current source with the resistance in parallel.
10. A voltage source of 300 V has internal resistance of 4Ω and supplies a load having the same resistance. The power absorbed by the load is?
a) 1150 W
b) 1250 W
c) 5625 W
d) 5000 W
Explanation: Power absorbed = I2R.