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block

A transmission line carries 3.50 A of ac current and 150 V ac. The true power in the line is:

Select the correct answer(s).  

(0/0)

---

42.9 W

Variable, depending on standing wave effects

525 W

1.84 W

Meaningless; true power is dissipated, not transmitted

none

At a frequency of 2.55 MHz, a 330-pF capacitor has a reactance of

Select the correct answer(s).  

(0/0)

---

−0.000189 Ω

−189 Ω

−18.9k Ω

−0.00528 Ω

−5.28 Ω

none

A wave has a frequency of 200 kHz. How many degrees of phase change occur in a microsecond (a millionth of a second)?

Select the correct answer(s).  

(0/0)

---

90 degrees

144 degrees

72 degrees

180 degrees

120 degrees

none

Mutual inductance causes the net value of a set of coils to

Select the correct answer(s).  

(0/0)

---

Be less than what it would be with no mutual coupling

Cancel out, resulting in zero inductance

Vary, depending on the extent and phase of mutual coupling

Double

Be greater than what it would be with no mutual coupling

none

A coil has an inductance of 750 μH. The inductive reactance at 100 kHz is

Select the correct answer(s).  

(0/0)

---

75.0 Ω

471 Ω

75.0 k Ω

47.1 k Ω

212 Ω

none

Four capacitors are connected in parallel. Their values are 100 pF each. The net capacitance is

Select the correct answer(s).  

(0/0)

---

400 pF

25 pF

50 pF

100 pF

200 pF

none

A transformer has a primary-to-secondary turns ratio of exactly 8.88:1. The input voltage is 234 V rms. The output voltage is

Select the correct answer(s).  

(0/0)

---

26.4 V rms

2.97 V rms

20.8 V rms

2.08 kV rms

18.5 kV rms

none

A transformer has a step-up turns ratio of 1:3.16. The output impedance is 499Ω purely resistive. The input impedance is

Select the correct answer(s).  

(0/0)

---

1.58k Ω

50.0 Ω

158 Ω

Not determinable from the data given

4.98k Ω

none

In a parallel configuration, susceptances

Select the correct answer(s).  

(0/0)

---

Cancel out

Must be changed to reactances before you can work with them

Add like capacitances in series

Simply add up

Add like inductances in parallel

none

Refer to Fig. TEST 2-1. Wave A is

Select the correct answer(s).  

(0/0)

---

Leading wave B by 90 degrees

Leading wave B by 180 degrees

Lagging wave B by 90 degrees

Lagging wave B by 135 degrees

Lagging wave B by 45 degrees

none

Two waves are 180 degrees out of phase. This is a difference of

Select the correct answer(s).  

(0/0)

---

1/2 cycle

1/8 cycle

1/4 cycle

Two full cycles

A full cycle

none

A complex impedance is represented by 34 − j23. The absolute-value impedance is

Select the correct answer(s).  

(0/0)

---

11 Ω

34 Ω

57 Ω

-23 Ω

41 Ω

none

A series circuit has a resistance of 100 Ω and a capacitive reactance of -200 Ω. The complex impedance is

Select the correct answer(s).  

(0/0)

---

100 + j200

200 + j100

200 - j100

100 - j200

200 + j100

none

In a series RL circuit, as the resistance becomes small compared with the reactance, the angle of lag approaches

Select the correct answer(s).  

(0/0)

---

0 degrees

360 degrees

90 degrees

45 degrees

180 degrees

none

A sine wave has a peak value of 30.0 V. Its rms value is

Select the correct answer(s).  

(0/0)

---

60.0 V

21.2 V

42.4 V

30.0 V

90.0 V