Electrical Engineering

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28 Mar 2025 11:03 AM study24x7

In Δ-connected generator, all of the phase voltages are

A

zero

B

equal in magnitude

C

one-third of total

D

one-sixth of total

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Electrical Engineering

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27 Mar 2025 11:34 AM study24x7

In a Y-connected source feeding Δ -connected load,

A

each phase of the load has one-third of the full line voltage across it

B

each phase of the load has two-thirds of the full line voltage across it

C

each phase of the load has the full line voltage across it

D

each phase of the load has a voltage across it equal to √3

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Electrical Engineering

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27 Mar 2025 11:32 AM study24x7

The most common type of ac motor is the

A

single-phase induction motor

B

two-phase induction motor

C

three-phase induction motor

D

two-phase squirrel-cage motor

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Electrical Engineering

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27 Mar 2025 11:31 AM study24x7

In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of

A

0°

B

30°

C

60°

D

120°

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Electrical Engineering

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26 Mar 2025 12:23 PM study24x7

In a certain Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is

A

3 A

B

6 A

C

9 A

D

27 A

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Electrical Engineering

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26 Mar 2025 12:22 PM study24x7

Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

A

certain constant phase angles

B

certain constant frequencies

C

certain constant voltages

D

certain constant currents

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Electrical Engineering

6 followers study24x7

26 Mar 2025 12:22 PM study24x7

If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?

A

0 V

B

90 V

C

156 V

D

180 V

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Electrical Engineering

6 followers study24x7

25 Mar 2025 11:48 AM study24x7

Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω.

A

single-phase 32 A; three-phase 16 A

B

single-phase 16 A; three-phase 8 A

C

single-phase 8 A; three-phase 4 A

D

single-phase 16 A; three-phase 0 A

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Electrical Engineering

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25 Mar 2025 11:47 AM study24x7

A three-phase generator is connected to three 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

A

0 A

B

1.33 A

C

3.99 A

D

2.66 A

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Electrical Engineering

6 followers study24x7

25 Mar 2025 11:47 AM study24x7

A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is

A

13.3 mA

B

133 mA

C

1.33 A

D

6.2 A

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Electrical Engineering

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24 Mar 2025 01:11 PM study24x7

A two-phase generator is connected to two 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

A

1.33 A

B

1.88 A

C

2.66 A

D

1.77 A

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Electrical Engineering

6 followers study24x7

24 Mar 2025 01:06 PM study24x7

A constant load power means a uniform conversion of

A

mechanical to electrical energy

B

electrical to mechanical energy

C

current to voltage

D

voltage to current

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Electrical Engineering

6 followers study24x7

24 Mar 2025 12:59 PM study24x7

In a Y-connected circuit, the magnitude of each line current is

A

one-third the phase current

B

three times the corresponding phase current

C

equal to the corresponding phase current

D

zero

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Electrical Engineering

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21 Mar 2025 01:05 PM study24x7

In a Y-Y source/load configuration, the

A

phase current, the line current, and the load current are all equal in each phase

B

phase current, the line current, and the load current are 120° out of phase

C

phase current and the line current are in phase, and both are 120° out of phase with the load current

D

line current and the load current are in phase, and both are out of phase with the phase current

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Electrical Engineering

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21 Mar 2025 01:04 PM study24x7

In Δ - connected source feeding a Y-connected load,

A

each phase voltage equals the difference of the corresponding load voltages

B

each phase voltage equals the corresponding load voltage

C

each phase voltage is one-third the corresponding load voltage

D

each phase voltage is 60° out of phase with the corresponding load voltage

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Electrical Engineering

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21 Mar 2025 01:02 PM study24x7

In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are

A

2,000 V

B

6,000 V

C

666 V

D

3,464 V

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Electrical Engineering

6 followers study24x7

20 Mar 2025 12:08 PM study24x7

In Δ - connected source driving Δ - connected load, the

A

load voltage and line voltage are one-third the source voltage for a given phase

B

load voltage and line voltage are two-thirds the source voltage for a given phase

C

load voltage and line voltage cancel for a given phase

D

load voltage, line voltage, and source phase voltage are all equal for a given phase

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Electrical Engineering

6 followers study24x7

20 Mar 2025 12:06 PM study24x7

In a three-phase system, when the loads are perfectly balanced, the neutral current is

A

zero

B

one-third of maximum

C

two-thirds of maximum

D

at maximum

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Electrical Engineering

6 followers study24x7

20 Mar 2025 11:55 AM study24x7

In a three-phase system, the voltages are separated by

A

45°

B

90°

C

120°

D

180°

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Electrical Engineering

6 followers study24x7

19 Mar 2025 11:18 AM study24x7

In an RC differentiator, the capacitor

A

charges exponentially at a rate depending on the RC time constant

B

charges exponentially at a rate depending on the input voltage

C

charges when the input voltage is decreasing

D

charges to approximately one time constant

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