# Voltage and Current Sources Question and Answers

### 1. For a **voltage source** to be neglected, the terminals across the source are ______

- Replaced by inductor
- Short circuited
- Replaced by some resistance
- Open circuited

### 2. To neglect a current source, the terminals across the source are

- Open-circuited
- Short-circuited
- Replaced by an inductor
- Replaced by some resistance

### 3. In the case of ideal current sources, they have _______

- Zero internal resistance
- The low value of voltage
- A large value of current
- Infinite internal resistance

### 4. A dependent source _______

- Is always a voltage source
- Maybe a current source or a voltage source
- Is always a current source
- None of the mentioned

### 5. A practical voltage source can also be represented as _______

- Resistance in series with an ideal current source
- Resistance in series with an ideal voltage source
- Resistance in parallel with an ideal voltage source
- None of the mentioned

### 6. A practical current source can also be represented as ________

- Resistance in parallel with an ideal current source
- Resistance in parallel with an ideal voltage source
- Resistance in series with an ideal current source
- None of the mentioned

### 7. Which of the following statement is incorrect about active and Passive elements?

- The inductor is a passive element
- The current source is an active element
- The resistor is a passive element
- The voltage source is a passive element

### 8. Which of the following is true about an ideal voltage source?

- Zero resistance
- Small emf
- Large emf
- Infinite resistance

### 9. The terminals across the source are _____ if a current source is to be neglected.

- Replaced by a source resistance
- Open circuited
- Replaced by a capacitor
- Short circuited

### 10. The capacitor C which has zero initial charge at t = 0^{+} acts as a

- Open circuit
- Short circuit
- A current source
- A voltage source

### 11. The Inductor L which has zero initial charges at t = 0^{+} acts as a

- Open circuit
- Short circuit
- A current source
- A voltage source

### 12. Constant voltage source is _______

- Active and bilateral
- Passive and bilateral
- Active and unilateral
- Passive and unilateral

### 13. When the output voltage of a voltage source decreases as the load current increases are called as

- Unloading of sources
- Loading of sources
- Deterioration of sources
- Enhancement of sources

### 14. In a network consisting of linear resistors and ideal voltage source, if the value of resistors are doubled, then the voltage across each resistor _______

- Increases four times
- Remains unchanged
- Doubled
- Halved

### 15. When a voltage source is converted into a current source or a current source into a voltage source is called as?

- Source transformation
- Voltage Transformation
- Current Transformation
- Circuit transformation

### 16. Which of the following transformation is shown below in the given figure?

- Source transformation
- Voltage transformation
- Current transformation
- None of the above

### 17. If the voltage source is converted into the current source, we consider the _________ equivalence, then:

- Short circuit current
- Open circuit current
- Open-short circuit current
- Any of the above

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### 18. A voltage source having an open-circuit voltage of 100 V and internal resistance of 50 ohms is equivalent to a current source of:

- 2 A in parallel with 100 ohms
- 2 A in series with 50 ohms
- 0.5 A in parallel with 50 ohms
- 2 A in parallel with 50 ohms

### 19. A current source of 100 A with an internal resistance of 10 Ω into an equivalent voltage source of

- 100V and 10Ω
- 1000V and 10Ω
- 10V and 10Ω
- 1000 V and 1000Ω

### 20. Voltage source and terminal voltage can be related as ________

- Terminal voltage is higher than the source emf
- Terminal voltage is equal to the source emf
- Terminal voltage is always lower than source emf
- Terminal voltage cannot exceed source emf