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- Question
A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?
Options- A. 4.73
- B. 0.4 V
- C. 24 V
- D. 600 V
- E. None of the above
- Correct Answer
- 24 V
- 1. Doubling the operating voltage of a purely capacitive circuit:
Options- A. has no effect on the capacitive reactance
- B. doubles the amount of capacitive reactance
- C. multiplies the capacitive reactance by 7
- D. cuts the capacitive reactance in half
- E. None of the above Discuss
- 2. For a pure capacitor:
Options- A. ac current and voltage are exactly in phase
- B. ac current leads the voltage by 90 degree
- C. ac current is converted to dc voltage
- D. ac current lags the voltage by 90 degree
- E. None of the above Discuss
- 3. If a load resistance is 1 kW, a stiff current source has a resistance of
Options- A. At least 10 Ohm
- B. Less than 10 Ohm
- C. More than 100 k Ohm
- D. Less than 100 k Ohm
- E. None of the above Discuss
- 4. What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm
Options- A. 180 degree
- B. 30 degree
- C. 45 degree
- D. 75 degree
- E. None of the above Discuss
- 5. Doubling the number of turns of wire in an inductor:
Options- A. reduces the value of inductance by one-half
- B. multiplies the value of inductance by two
- C. multiplies the value of inductance by four
- D. reduces the value of inductance by one-fourth
- E. None of the above Discuss
- 6. The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:
Options- A. rotor
- B. armature
- C. battery
- D. commutator
- E. None of the above Discuss
- 7. Holes are the minority carriers in which type of semiconductor?
Options- A. Extrinsic
- B. Intrinsic
- C. n-type
- D. p-type
- E. None of the above Discuss
- 8. Which one of the following statements is true for the voltages in a series RC circuit?
Options- A. The total voltage is equal to the sum of the voltages across the resistance and capacitance
- B. The voltage always has the same amplitude and phase for every part of the circuit
- C. The total voltage is less than the sum of the voltages across the resistance and capacitance
- D. The total voltage is greater than the sum of the voltages across the resistance and capacitance
- E. None of the above Discuss
- 9. When the collector current increases, what does the current gain do?
Options- A. decreases
- B. stays the same
- C. increases
- D. any of the above
- E. None of the above Discuss
- 10. The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
Options- A. 250 ?A
- B. 350 ?A
- C. 0.25 ?A
- D. 300 ?A
- E. None of the above Discuss
Electronic Principles problems
Search Results
Correct Answer: has no effect on the capacitive reactance
Correct Answer: ac current leads the voltage by 90 degree
Correct Answer: More than 100 k Ohm
Correct Answer: 45 degree
Correct Answer: multiplies the value of inductance by four
Correct Answer: commutator
Correct Answer: n-type
Correct Answer: The total voltage is less than the sum of the voltages across the resistance and capacitance
Correct Answer: increases
Correct Answer: 250 ?A
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