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- Question
Two inductors, L1 and L2, are in parallel. L1 has a value of 25 µH and L2 a value of 50 µH. The parallel combination is in series with L3, a 20 µH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is
Options- A. 87 mA
- B. 870 mA
- C. 87 A
- D. 337 mA
- Correct Answer
- 870 mA
- 1. Resistance is measured in
Options- A. henries
- B. ohms
- C. hertz
- D. watts Discuss
- 2. What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 µWb?
Options- A. 6,000 µT
- B. 600 µT
- C. 600 T
- D. 6 T Discuss
- 3. All the voltage drops and the source voltage added together in a series circuit is equal to
Options- A. the total of the voltage drops
- B. the source voltage
- C. zero
- D. the total of the source voltage and the voltage drops Discuss
- 4. A certain voltage divider consists of three 1 kΩ resistors in series. Which of the following load resistors will have the least effect on the output voltage?
Options- A. 1 MΩ
- B. 100 kΩ
- C. 1 kΩ
- D. 330 Ω Discuss
- 5. A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will
Options- A. increase
- B. remain the same
- C. decrease
- D. be less selective Discuss
- 6. The first row of a certain determinant has the numbers 3 and 5. The second row has the numbers 7 and 2. The value of this determinant is
Options- A. 31
- B. ?31
- C. 39
- D. ?29 Discuss
- 7. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
Options- A. R = XC
- B. R > XC
- C. R < XC
- D. R = 5XC Discuss
- 8. The stator is the rotating assembly in a generator or motor.
Options- A. True
- B. False Discuss
- 9. The quantity 3.3 × 103 is the same as
Options- A. 330
- B. 3,300
- C. 33,000
- D. 0.0033 Discuss
- 10. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
Options- A. 2,400 At
- B. 240 At
- C. 24 At
- D. 2.4 At Discuss
More questions
Correct Answer: ohms
Correct Answer: 6,000 µT
Correct Answer: zero
Correct Answer: 1 MΩ
Correct Answer: decrease
Correct Answer: ?29
Correct Answer: R < XC
Correct Answer: False
Explanation:
The two main parts of a generator or motor can be described in either mechanical or electrical terms:
Mechanical:
Rotor: The rotating part of an electrical machine
Stator: The stationary part of an electrical machine
Electrical:
Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current. The armature can be on either the rotor or the stator.
Field: The magnetic field component of an electrical machine. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator.
Mechanical:
Rotor: The rotating part of an electrical machine
Stator: The stationary part of an electrical machine
Electrical:
Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current. The armature can be on either the rotor or the stator.
Field: The magnetic field component of an electrical machine. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator.
Correct Answer: 3,300
Correct Answer: 24 At
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