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1. The flux in a magnetic circuit can be compared in an electric circuit to (A) the voltage (C) the resistance (B) the current (D) the inductance 2. The term permeability for a material means (A) the number of turns on an air core (B) (B) the mmf required to produce one unit of magnetic flux (C) the ability of the material to conduct current (D) the ability of the material to conduct current magnetic lines through it of force 3. The principle of statically induced emf is utilized in (A) transformer (C) generator (B) motor (D) battery

1. The flux in a magnetic circuit can be compared in an electric circuit to (A) the voltage (C) the resistance (B) the current (D) the inductance 2. The term permeability for a material means (A) the number of turns on an air core (B) (B) the mmf required to produce one unit of magnetic flux (C) the ability of the material to conduct current (D) the ability of the material to conduct current magnetic lines through it of force 3. The principle of statically induced emf is utilized in (A) transformer (C) generator (B) motor (D) battery

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter29: Dc Generators
Section: Chapter Questions
Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...
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1. The flux in a magnetic circuit can be compared in an electric circuit to (A) the voltage (C) the resistance (B) the current (D) the inductance 2. The term permeability for a material means (A) the number of turns on an air core (B) (B) the mmf required to produce one unit of magnetic flux (C) the ability of the material to conduct current (D) the ability of the material to conduct current magnetic lines through it of force 3. The principle of statically induced emf is utilized in (A) transformer (C) generator (B) motor (D) battery 4. The unit(s) of inductance is (are) (A) henry (C) Wb/A (B) Vs/A (D) all of the above 5. If an emf of 8V is induced in a coil of inductance 4 H, the rate of change of current through it must be (A) 32 A/s (C) 2 A/s (B) 0.5 A/s (D) 12 A/s The iron core from an iron-cored coil is removed so that 6. it becomes air-cored. The inductance of the coil will (A) decrease (C) remains the same (D) any of the above (B) increase 7. A coil having a core of length 10 cm has an inductance of 5 mH. If its core length is doubled, all other quantities remaining the same, the inductance will become mH. (A) 1.25 (C) 10 (В) 2.5 (D) 2 8. In a series RL circuit excited by a battery, the final value of current in the circuit does not depend on (A) battery emf E (C) inductanceL (D) both E and L 9. When a circuit is switch off, sparking may occur if the (B) resistance R circuit is (A) highly resistive (C) highly capacitive (B) highly inductive (D) all of the above 10. For a series RC circuit excited by a dc voltage Vo, the initial current is (A) zero (C) V/R (B) infinity (D) V/C
Transcribed Image Text:1. The flux in a magnetic circuit can be compared in an electric circuit to (A) the voltage (C) the resistance (B) the current (D) the inductance 2. The term permeability for a material means (A) the number of turns on an air core (B) (B) the mmf required to produce one unit of magnetic flux (C) the ability of the material to conduct current (D) the ability of the material to conduct current magnetic lines through it of force 3. The principle of statically induced emf is utilized in (A) transformer (C) generator (B) motor (D) battery 4. The unit(s) of inductance is (are) (A) henry (C) Wb/A (B) Vs/A (D) all of the above 5. If an emf of 8V is induced in a coil of inductance 4 H, the rate of change of current through it must be (A) 32 A/s (C) 2 A/s (B) 0.5 A/s (D) 12 A/s The iron core from an iron-cored coil is removed so that 6. it becomes air-cored. The inductance of the coil will (A) decrease (C) remains the same (D) any of the above (B) increase 7. A coil having a core of length 10 cm has an inductance of 5 mH. If its core length is doubled, all other quantities remaining the same, the inductance will become mH. (A) 1.25 (C) 10 (В) 2.5 (D) 2 8. In a series RL circuit excited by a battery, the final value of current in the circuit does not depend on (A) battery emf E (C) inductanceL (D) both E and L 9. When a circuit is switch off, sparking may occur if the (B) resistance R circuit is (A) highly resistive (C) highly capacitive (B) highly inductive (D) all of the above 10. For a series RC circuit excited by a dc voltage Vo, the initial current is (A) zero (C) V/R (B) infinity (D) V/C
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