Element IV - Amateur Radio Practice

50 Questions | By Du1kja | Updated: Mar 21, 2022 | Attempts: 708

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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.

Microfarad and picofaradare unit of
- 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