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

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

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

load voltage and line voltage cancel for a given phase

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

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

each phase voltage equals the corresponding load voltage

each phase voltage equals the difference of the corresponding load voltages

each phase voltage equals the corresponding load voltage

each phase voltage is one-third the corresponding load voltage

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

The two basic components of a Thevenin equivalent ac circuit are

the equivalent voltage source and the equivalent series resistance

the equivalent voltage source and the equivalent series impedance

the equivalent voltage source and the equivalent series resistance

the equivalent voltage source and the equivalent parallel impedance

the equivalent voltage source and the equivalent parallel resistance

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

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

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

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

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

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

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 .

single-phase 8 A; three-phase 4 A

single-phase 32 A; three-phase 16 A

single-phase 16 A; three-phase 8 A

single-phase 8 A; three-phase 4 A

single-phase 16 A; three-phase 0 A

In a Y-Y source/load configuration, the

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

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

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

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

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

A constant load power means a uniform conversion of

mechanical to electrical energy

electrical to mechanical energy

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

three times the corresponding phase current

equal to the corresponding phase current

The Norton equivalent current is

the open-current from the source

Norton's theorem gives

an equivalent current source in series with an equivalent impedance

an equivalent current source in parallel with an equivalent impedance

an equivalent current source in series with an equivalent impedance

an equivalent voltage source in parallel with an equivalent impedance

an equivalent voltage source in series with an equivalent impedance

If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant

is the difference between the two currents

In a series RLC circuit that is operating above the resonant frequency, the current

is in phase with the applied voltage

553 + Mcqs in Electrical Engineering in Engineering Page 4 McqOptions

151.	In a -connected source driving a -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
Answer» E.

Discussion

152.	In a -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
Answer» B. each phase voltage equals the corresponding load voltage

Discussion

153.	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
Answer» E.

Discussion

154.	The two basic components of a Thevenin equivalent ac circuit are
A.	the equivalent voltage source and the equivalent series impedance
B.	the equivalent voltage source and the equivalent series resistance
C.	the equivalent voltage source and the equivalent parallel impedance
D.	the equivalent voltage source and the equivalent parallel resistance
Answer» B. the equivalent voltage source and the equivalent series resistance

Discussion

155.	In a Y-connected source feeding a -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
E.	<img src="/_files/images/electrical-engineering/squareofthree.gif">
Answer» D. each phase of the load has a voltage across it equal to

Discussion

156.	A three-phase generator is connected to three 90 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
Answer» B. 1.33 A

Discussion

157.	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 .
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
Answer» C. single-phase 8 A; three-phase 4 A

Discussion

158.	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
Answer» B. phase current, the line current, and the load current are 120 out of phase

Discussion

159.	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
Answer» C. current to voltage

Discussion

160.	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
Answer» D. zero

Discussion

161.	A two-phase generator is connected to two 90 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
Answer» E.

Discussion

162.	A single-phase sinusoidal voltage of 120 V is connected to a 90 load. Current in the circuit is
A.	13.3 mA
B.	133 mA
C.	1.33 A
D.	6.2 A
Answer» D. 6.2 A

Discussion

163.	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
Answer» C. 60

Discussion

164.	Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure.
A.	1,027 Hz
B.	10,270 Hz
C.	6,330 Hz
D.	63,330 Hz
Answer» B. 10,270 Hz

Discussion

165.	Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if V_S = 4.5 V_RMS?
A.	226 mW
B.	2.26 mW
C.	4.24 mW
D.	424 mW
Answer» E.

Discussion

166.	The Norton equivalent current is
A.	the current through the load
B.	the open-current from the source
C.	the short circuit current
D.	none of the above
Answer» D. none of the above

Discussion

167.	To derive 18 V and 12 V from a 24 V supply requires a voltage divider with three taps.
A.	True
B.	False
Answer» B. False

Discussion

168.	A Wheatstone bridge is often shown in a "diamond" configuration.
A.	True
B.	False
Answer» B. False

Discussion

169.	A galvanometer is a meter that measures small amounts of voltage.
A.	True
B.	False
Answer» C.

Discussion

170.	Using Kirchhoff's voltage law, you can find the voltages across certain parts of a series-parallel circuit.
A.	True
B.	False
Answer» B. False

Discussion

171.	A Wheatstone bridge consists of four resistors in parallel.
A.	True
B.	False
Answer» C.

Discussion

172.	Two equal-value resistors in series will divide the source voltage equally.
A.	True
B.	False
Answer» B. False

Discussion

173.	A resistor ladder network is a special type of series-parallel circuit.
A.	True
B.	False
Answer» B. False

Discussion

174.	A smaller-value load resistor will cause the output voltage to change more than a larger-value one.
A.	True
B.	False
Answer» B. False

Discussion

175.	Using the current-divider formula, you can find the current in any branch of a series-parallel circuit.
A.	True
B.	False
Answer» B. False

Discussion

176.	When converting 0.16 mA to microamperes, the result is
A.	16 A
B.	160 A
C.	1,600 A
D.	0.0016 A
Answer» C. 1,600 A

Discussion

177.	Two resistors are in series: a 5.6 k resistor and a 4.7 k resistor. The voltage drop across the 5.6 k resistor is 10 V. The voltage across the 4.7 k resistor is
A.	8.39 V
B.	10 V
C.	2.32 V
D.	0 V
Answer» B. 10 V

Discussion

178.	Find the node voltage V_A.
A.	518 mV
B.	5.18 V
C.	9.56 V
D.	956 mV
Answer» C. 9.56 V

Discussion

179.	Five inductors are connected in series. The lowest value is 8 H. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is
A.	8 H
B.	32 H
C.	64 H
D.	248 H
Answer» E.

Discussion

180.	Norton's theorem gives
A.	an equivalent current source in parallel with an equivalent impedance
B.	an equivalent current source in series with an equivalent impedance
C.	an equivalent voltage source in parallel with an equivalent impedance
D.	an equivalent voltage source in series with an equivalent impedance
Answer» B. an equivalent current source in series with an equivalent impedance

Discussion

181.	A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
A.	25 kHz
B.	12 kHz
C.	18 kHz
D.	1.3 MHz
Answer» C. 18 kHz

Discussion

182.	Referring to Problem 8, the total current is
A.	1.5 A
B.	573 mA
C.	5.73 A
D.	1.19 A
Answer» D. 1.19 A

Discussion

183.	If the value of C in a series RLC circuit is decreased, the resonant frequency
A.	is not affected
B.	increases
C.	is reduced to zero
D.	decreases
Answer» C. is reduced to zero

Discussion

184.	If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant
A.	is zero
B.	is the sum of the two currents
C.	is the difference between the two currents
D.	cannot be determined
Answer» C. is the difference between the two currents

Discussion

185.	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
Answer» D. 27 A

Discussion

186.	In a series RLC circuit that is operating above the resonant frequency, the current
A.	lags the applied voltage
B.	leads the applied voltage
C.	is in phase with the applied voltage
D.	is zero
Answer» B. leads the applied voltage

Discussion

187.	Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is
A.	16.54 V
B.	1.65 V
C.	10.60 V
D.	5.93 V
Answer» B. 1.65 V

Discussion

188.	Three hundred joules of energy are consumed in 15 s. The power is
A.	2,000 W
B.	2 W
C.	20 W
D.	200 W
Answer» D. 200 W

Discussion

189.	When a fourth resistor is connected in series with three resistors, the total resistance
A.	increases by one-fourth
B.	increases
C.	decreases
D.	remains the same
Answer» C. decreases

Discussion

190.	A material that does not allow current under normal conditions is a(n)
A.	insulator
B.	conductor
C.	semiconductor
D.	valence
Answer» B. conductor

Discussion

191.	A circuit breaker is a
A.	fuse
B.	switch
C.	resettable protective device
D.	resistor
Answer» D. resistor

Discussion

192.	A current of 200 A through a 6.8 k resistor produces a voltage drop of
A.	34.4 V
B.	340 V
C.	13.6 V
D.	1.36 V
Answer» E.

Discussion

193.	A 6 V battery is connected to a 300 load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
A.	1 h
B.	200 h
C.	2,000 h
D.	10 h
Answer» D. 10 h

Discussion

194.	The total resistance of a circuit is 680 . The percentage of the total voltage appearing across a 47 resistor that makes up part of the total series resistance is
A.	68%
B.	47%
C.	69%
D.	6.91%
Answer» E.

Discussion

195.	The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltage
A.	decreases
B.	increases
C.	remains the same
D.	becomes zero
Answer» B. increases

Discussion

196.	If a 6 V and a 9 V source are connected series aiding, the total voltage is
A.	6 V
B.	9 V
C.	3 V
D.	15 V
Answer» E.

Discussion

197.	How many watt-hours represent 65 W used for 18 h?
A.	11.7 Wh
B.	1,170 Wh
C.	11,700 Wh
D.	117,000 Wh
Answer» C. 11,700 Wh

Discussion

198.	A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is
A.	132 mW
B.	13.2 mW
C.	22.6 mW
D.	226 mW
Answer» B. 13.2 mW

Discussion

199.	The higher the range setting, the less the internal resistance and the greater the load effect of the voltmeter on a circuit.
A.	True
B.	False
Answer» C.

Discussion

200.	A two-terminal variable resistor is known as a
A.	potentiometer
B.	thermistor
C.	rheostat
D.	wiper
Answer» D. wiper

Discussion

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

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