Electrical Engineering

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20 Nov 2024 11:15 AM study24x7

A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

A

90

B

180

C

270

D

360

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Electrical Engineering

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20 Nov 2024 11:15 AM study24x7

There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 μWb?

A

14,400 At/Wb

B

1,440 At/Wb

C

9,000 At/Wb

D

90,000 At/Wb

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Electrical Engineering

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20 Nov 2024 11:10 AM study24x7

If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

A

increases

B

decreases

C

is zero

D

will remain constant

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Electrical Engineering

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19 Nov 2024 11:42 AM study24x7

The unit for reluctance is

A

tesla

B

At/Wb

C

At/m

D

Wb

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Electrical Engineering

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19 Nov 2024 11:41 AM study24x7

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

A

increase

B

decrease

C

remain constant

D

be excessive

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Electrical Engineering

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19 Nov 2024 11:40 AM study24x7

What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 μ Wb/At × m?

A

1111 At/Wb

B

111 At/Wb

C

11 At/Wb

D

1 At/Wb

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Electrical Engineering

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14 Nov 2024 12:05 PM study24x7

When the current through the coil of an electromagnet reverses, the

A

direction of the magnetic field reverses

B

direction of the magnetic field remains unchanged

C

magnetic field expands

D

magnetic field collapses

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Electrical Engineering

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14 Nov 2024 12:04 PM study24x7

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

A

increases

B

decreases

C

remains the same

D

doubles

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Electrical Engineering

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14 Nov 2024 12:03 PM study24x7

For a given wirewound core, an increase in current through the coil

A

reverses the flux lines

B

decreases the flux density

C

increases the flux density

D

causes no change in flux density

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Electrical Engineering

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13 Nov 2024 10:48 AM study24x7

The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

A

1,000 V

B

2,000 V

C

31.25 V

D

3,125 V

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Electrical Engineering

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13 Nov 2024 10:48 AM study24x7

When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

A

increases

B

decreases

C

remains constant

D

reaches zero

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Electrical Engineering

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13 Nov 2024 10:45 AM study24x7

The branch current method uses

A

Kirchhoff's voltage and current laws

B

Thevenin's theorem and Ohm's law

C

Kirchhoff's current law and Ohm's law

D

the superposition theorem and Thevenin's theorem

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Electrical Engineering

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12 Nov 2024 10:39 AM study24x7

The expansion method for evaluating determinants is

A

better than any other method

B

good for only one determinant

C

more flexible than the cofactor method

D

good for second- and third-order determinants

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Electrical Engineering

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12 Nov 2024 10:39 AM study24x7

The first row of a certain determinant has the numbers 10 and 6. The second row has the numbers 3 and 5. The value of this determinant is

A

18

B

50

C

32

D

–32

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Electrical Engineering

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12 Nov 2024 10:38 AM study24x7

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

A

31

B

–31

C

39

D

–29

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Electrical Engineering

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11 Nov 2024 12:26 PM study24x7

In assigning the direction of branch currents,

A

the directions are critical

B

the directions are not critical

C

they must point into a node

D

they must point out of a node

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Electrical Engineering

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11 Nov 2024 12:14 PM study24x7

In a two-source circuit, one source acting alone produces 12 mA through a given branch. The other source acting alone produces 10 mA in the opposite direction through the same branch. The actual current through the branch is

A

22 mA

B

12 mA

C

10 mA

D

2 mA

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Electrical Engineering

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11 Nov 2024 12:12 PM study24x7

The parallel combination of a 470 Ω resistor and a 1.2 kΩ resistor is in series with the parallel combination of three 3 kΩ resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value of

A

470 Ω or 1.2 kΩ

B

3 kΩ

C

470 Ω

D

1.2 kΩ

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Electrical Engineering

5 followers study24x7

09 Nov 2024 03:10 PM study24x7

A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the output voltage be if a load resistor of 1 MΩ is connected to the output?

A

0.57 V

B

6 V

C

12 V

D

5.7 V

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Electrical Engineering

5 followers study24x7

09 Nov 2024 03:09 PM study24x7

In a certain five-step R/2R ladder network, the smallest resistor value is 1 kΩ. The largest value is

A

indeterminable

B

2 kΩ

C

10 kΩ

D

20 kΩ

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