# Element IV - Amateur Radio Practice

50 Questions | Total Attempts: 637  Settings  • 1.
When the collector is common to both the input and the output of a transistor circuit the transistor is configured in
• A.

Common base

• B.

Common collector

• C.

Common emitter

• D.

None of the above

• 2.
The logarithm of the ratio of the output power over the input power is
• A.

Watts

• B.

Decibels

• C.

Bell

• D.

Gain

• 3.
The frequencies comprising the extra high frequency (EHF)
• A.

30 kHZ to 300 MHZ

• B.

30 GHZ to 300 GHZ

• C.

30 MHZ to 300 GHZ

• D.

30 HZ to 300 HZ

• 4.
A voltage standing wave ratio of an antenna is measured with
• A.

Grid-dip meter

• B.

An SWR meter

• C.

Voltmeter

• D.

Impedance meter

• 5.
What is the capacitance of a 6 uF capacitor in parallel with a capacitor 4 uF?
• A.

5 uF

• B.

2 uF

• C.

10 uF

• D.

6 uF

• 6.
A series circuit consists of inductance of 500 uH and a capacitor of 400 pF. What is the resonant frequency of the circuit?
• A.

456 kHz

• B.

356 kHz

• C.

500 kHz

• D.

400 kHz

• 7.
What is the capacitive reactance of 350 pF capacitor a t a frequency of 1200 kHz?
• A.

560 ohms

• B.

379 ohms

• C.

379 uf

• D.

379 henry

• 8.
Three cells, each with an EMF of 1.4 Volts and internal resistance of 0.15 ohms, are connected in parallel, and a resistance of 1.35 ohms is connected across the group. How much current flows in the circuit?
• A.

1.0 Ampere

• B.

2.0 Ampere

• C.

3.0 Ampere

• D.

4.0 Ampere

• 9.
A cell whose internal resistance is 0.15 ohms delivers 0.50 Ampere to a resistance of 2.85 ohms.  What is the EMF of the cell?
• A.

1.0 Volts

• B.

1.5 Volts

• C.

3.0 Volts

• D.

3.5 Volts

• 10.
No. 14 copper wire has a resistance of 2.58 ohms/1000 ft.  What is the resistance of 1 mile of this wire?
• A.

23.6 ohms

• B.

10.6 ohms

• C.

13.6 ohms

• D.

15.6 ohms

• 11.
Three resistors R1 = 30 ohms, R2 = 160 ohms and R3 = 40 ohms are connected in series across a generator.  A voltmeter connected  across R2 reads 80 Volts.  What is the voltage of the generator?
• A.

220 Volts

• B.

115 Volts

• C.

110 Volts

• D.

240 Volts

• 12.
A voltage of  110 Volts across a resistor causes a current of 5 Ampere to flow through the resistor.  How much power is expended in the resistor?
• A.

5 Watts

• B.

50 Watts

• C.

500 Watts

• D.

550 Watts

• 13.
How much current will flow through a resistance of 50 ohms if a potential of  220 Volts is applied across it?
• A.

4.40 ohms

• B.

440 ohms

• C.

40 ohms

• D.

0.40 ohms

• 14.
A voltmeter connected across a resistance reads 22 V, and an ammeter connected in series with resistance reads 2.6 A.  What is the value of the resistance?
• A.

8.46 ohms

• B.

84.6 ohms

• C.

846 ohms

• D.

84.6 Kiloohms

• 15.
What is the characteristic of the current flow in a series RLC circuit at resonance
• A.

It is minimum

• B.

It is maximum

• C.

It is medium

• D.

None of the above

• 16.
What is the approximate magnitude of  the impedance of a parallel RLC circuit at resonance
• A.

Low

• B.

Mid

• C.

High

• D.

Low Mid

• 17.
What is the approximate magnitude of the impedance of a parallel RLC circuit at resonance
• A.

Low

• B.

Mid

• C.

High

• D.

Low mid

• 18.
What is the term for the phenomenon where most of a radio frequency current flows along the surface of the conductor
• A.

Field effect

• B.

Skin effect

• C.

Thermal effect

• D.

Burn effect

• 19.
The primary winding of a transformer has 2,000 turns and the secondary winding has has 500 turns.  If the primary is connected to 220 volts AC, what is the secondary voltage
• A.

5.5 volts

• B.

55 volts

• C.

550 volts

• D.

0.55 volts

• 20.
Give the decimal  equivalence of a picofarad
• A.

0.000,000,000,000,001 F

• B.

0.000,001 F

• C.

0.000,000,001 F

• D.

0.000,000,000,001 F

• 21.
• A.

Resistance

• B.

Capacitance

• C.

Impedance

• D.

Inductance

• 22.
Describe the component part of a  capacitor
• A.

Parallel resistive plates by plastic

• B.

Parallel conductive plates by dielectric

• C.

Parallel rubber plates by dielectric

• D.

Parallel inductive plates by copper

• 23.
In an electrical circuit, what is the opposition to the flow of  direct current caused by inductance of capacitance.
• A.

Conductance

• B.

Impedance

• C.

Reactance

• D.

Inductance

• 24.
How is the effect of reactance represented in formulas
• A.

X

• B.

Y

• C.

Z

• D.

F

• 25.
What is the opposition to the flow of an alternating current in circuit containing both resistance and reactance called?
• A.

Impedance

• B.

Inductance

• C.

Capacitance

• D.

Resistance

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