Inductors problems
- 1. Indication of transformer primary and secondary voltage relationships is accomplished by:
Options- A. color-coded wires
- B. dot notation
- C. black, rather than gray, casings
- D. winding ratios Discuss
Correct Answer: dot notation
- 2. When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:
Options- A. multiple-tapped secondary
- B. center-tapped secondary
- C. multiple winding secondary
- D. single winding secondary Discuss
Correct Answer: center-tapped secondary
- 3. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?
Options- A. The coil windings must be the same.
- B. coil 1
- C. The coil ratio is too small.
- D. coil 2 Discuss
Correct Answer: coil 2
- 4. Inductance is:
Options- A. directly proportional to the length of the coil
- B. directly proportional to the number of turns on the coil
- C. inversely proportional to the cross-sectional area of the coil
- D. inversely proportional to the permeability Discuss
Correct Answer: directly proportional to the number of turns on the coil
- 5. What type of device consists of a coil with a moveable iron core?
Options- A. solenoid
- B. reed switch
- C. relay
- D. armature Discuss
Correct Answer: solenoid
- 6. A value of "ten to the eighth power magnetic lines of force" is for the term:
Options- A. field
- B. flux
- C. coulomb
- D. weber Discuss
Correct Answer: weber
- 7. As current travels within a conductor:
Options- A. the magnetic field aids the current
- B. a magnetic field is developed around it
- C. the wire tries to point north
- D. an electrostatic field opposes the current Discuss
Correct Answer: a magnetic field is developed around it
- 8. What is the total inductance assuming no mutual inductance?
Options- A. 0 mH
- B. 0.69 mH
- C. 12 mH
- D. 24 mH Discuss
Correct Answer: 0.69 mH
- 9. What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?
Options- A. 500 ohms
- B. 1000 ohms
- C. 1414 ohms
- D. 2000 ohms Discuss
Correct Answer: 1414 ohms
- 10. What is the maximum source current for a transformer rated at 10 kVA, 1000/500 60 Hz?
Options- A. 2 A
- B. 5 A
- C. 10 A
- D. 20 A Discuss
Correct Answer: 20 A
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