003 - Measurements Flashcards by Aarif Rashid

A-003-001-001
What is the easiest amplitude dimension to measure by viewing a pure sine wave on an oscilloscope?

(a) Peak-to-peak voltage
(b) Peak voltage
(c) RMS voltage
(d) Average voltage

A-003-001-001
What is the easiest amplitude dimension to measure by viewing a pure sine wave on an oscilloscope?

(a) Peak-to-peak voltage

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A-003-001-002
What is the RMS value of a 340 volt peak-to-peak pure sine wave?

(a) 120 volts
(b) 170 volts
(c) 240 volts
(d) 300 volts

A-003-001-002
What is the RMS value of a 340 volt peak-to-peak pure sine wave?

(a) 120 volts

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A-003-001-003
What is the equivalent to the RMS value of an AC voltage?

(a) The AC voltage causing the same heating of a given resistor as a DC voltage of the same value
(b) The AC voltage found by taking the square root of the peak AC voltage
(c) The DC voltage causing the same heating of a given resistor as the peak AC voltage
(d) The AC voltage found by taking the square root of the average AC value

A-003-001-003
What is the equivalent to the RMS value of an AC voltage?

(a) The AC voltage causing the same heating of a given resistor as a DC voltage of the same value

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A-003-001-004
If the peak value of a 100 Hz sinusoidal waveform is 20 volts, the RMS value is:

(a) 28.28 volts
(b) 7.07 volts
(c) 16.38 volts
(d) 14.14 volts

A-003-001-004
If the peak value of a 100 Hz sinusoidal waveform is 20 volts, the RMS value is:

(d) 14.14 volts

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A-003-001-005
In applying Ohm’s law to AC circuits, current and voltage values are:

(a) peak values times 0.707
(b) average values
(c) average values times 1.414
(d) none of the proposed answers

A-003-001-005
In applying Ohm’s law to AC circuits, current and voltage values are:

(a) peak values times 0.707

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A-003-001-006
The effective value of a sine wave of voltage or current is:

(a) 50% of the maximum value
(b) 70.7% of the maximum value
(c) 100% of the maximum value
(d) 63.6% of the maximum value

A-003-001-006
The effective value of a sine wave of voltage or current is:

(b) 70.7% of the maximum value

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A-003-001-007
AC voltmeter scales are usually calibrated to read:

(a) peak voltage
(b) instantaneous voltage
(c) average voltage
(d) RMS voltage

A-003-001-007
AC voltmeter scales are usually calibrated to read:

(d) RMS voltage

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A-003-001-008
An AC voltmeter is calibrated to read the:

(a) peak-to-peak value
(b) average value
(c) peak value
(d) effective value

A-003-001-008
An AC voltmeter is calibrated to read the:

(d) effective value

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A-003-001-009
Which AC voltage value will produce the same amount of heat as a DC voltage, when applied to the same resistance?

(a) The average value
(b) The RMS value
(c) The peak value
(d) The peak-to-peak value

A-003-001-009
Which AC voltage value will produce the same amount of heat as a DC voltage, when applied to the same resistance?

(b) The RMS value

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A-003-001-010
What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts?

(a) 339.5 volts
(b) 84.8 volts
(c) 169.7 volts
(d) 204.8 volts

A-003-001-010
What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts?

(a) 339.5 volts

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A-003-001-011
A sine wave of 17 volts peak is equivalent to how many volts RMS?

(a) 24 volts
(b) 12 volts
(c) 34 volts
(d) 8.5 volts

A-003-001-011
A sine wave of 17 volts peak is equivalent to how many volts RMS?

(b) 12 volts

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A-003-002-001
The power supplied to the antenna transmission line by a transmitter during an RF cycle at the highest crest of the modulation envelope is known as:

(a) peak-envelope power
(b) mean power
(c) carrier power
(d) full power

A-003-002-001
The power supplied to the antenna transmission line by a transmitter during an RF cycle at the highest crest of the modulation envelope is known as:

(a) peak-envelope power

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A-003-002-002
To compute one of the following, multiply the peak-envelope voltage by 0.707 to obtain the RMS value, square the result and divide by the load resistance. Which is the correct answer?

(a) PIV
(b) ERP
(c) PEP
(d) power factor

A-003-002-002
To compute one of the following, multiply the peak-envelope voltage by 0.707 to obtain the RMS value, square the result and divide by the load resistance. Which is the correct answer?

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A-003-002-003
Peak-Envelope Power (PEP) for SSB transmission is:

(a) peak-voltage multiplied by peak current
(b) equal to the RMS power
(c) Peak-Envelope Voltage (PEV) multiplied by 0.707, squared and divided by the load resistance
(d) a hypothetical measurement

A-003-002-003
Peak-Envelope Power (PEP) for SSB transmission is:

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A-003-002-004
The formula to be used to calculate the power output of a transmitter into a resistor load using a voltmeter is:

(a) P = EI/R
(b) P = EI cos 0
(c) P = IR
(d) P = (E exponent 2) /R

A-003-002-004
The formula to be used to calculate the power output of a transmitter into a resistor load using a voltmeter is:

(d) P = (E exponent 2) /R

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A-003-002-005
How is the output Peak-Envelope Power of a transmitter calculated if an oscilloscope is used to measure the Peak-Envelope Voltage across a dummy resistive load (where PEP = Peak-Envelope Power, PEV = Peak-Envelope Voltage, Vp = peak-voltage, RL = load resistance)?

(a) PEP = [(Vp)(Vp)] / (RL)
(b) PEP = [(0.707 PEV)(0.707 PEV)] / RL
(c) PEP = (Vp)(Vp)(RL)
(d) PEP = [(1.414 PEV)(1.414 PEV)] / RL

(b) PEP = [(0.707 PEV)(0.707 PEV)] / RL

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A-003-002-006
What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

(a) 400 watts
(b) 1000 watts
(c) 100 watts
(d) 200 watts

A-003-002-006
What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

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A-003-002-007
What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

(a) 1250 watts
(b) 2500 watts
(c) 500 watts
(d) 625 watts

A-003-002-007
What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

(d) 625 watts

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A-003-002-008
What is the output PEP of an unmodulated carrier transmitter if a wattmeter connected to the transmitter output indicates an average reading of 1060 watts?

(a) 2120 watts
(b) 1500 watts
(c) 1060 watts
(d) 530 watts

A-003-002-008
What is the output PEP of an unmodulated carrier transmitter if a wattmeter connected to the transmitter output indicates an average reading of 1060 watts?

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A-003-002-009
What is the output PEP from a transmitter, if an oscilloscope measures 400 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

(a) 200 watts
(b) 400 watts
(c) 600 watts
(d) 1000 watts

A-003-002-009
What is the output PEP from a transmitter, if an oscilloscope measures 400 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

(b) 400 watts

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A-003-002-010
What is the output PEP from a transmitter, if an oscilloscope measures 800 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

(a) 800 watts
(b) 6400 watts
(c) 3200 watts
(d) 1600 watts

A-003-002-010
What is the output PEP from a transmitter, if an oscilloscope measures 800 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

(d) 1600 watts

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A-003-002-011
An oscilloscope measures 500 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output during unmodulated carrier conditions. What would an average-reading power meter indicate under the same transmitter conditions?

(a) 427.5 watts
(b) 884 watts
(c) 442 watts
(d) 625 watts

(d) 625 watts

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A-003-003-001
What is a dip meter?

(a) An SWR meter
(b) A marker generator
(c) A variable frequency oscillator with metered feedback current
(d) A field-strength meter

A-003-003-001
What is a dip meter?

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A-003-003-002
What does a dip meter do?

(a) It gives an indication of the resonant frequency of a circuit
(b) It measures transmitter output power accurately
(c) It measures field strength accurately
(d) It measures frequency accurately

A-003-003-002
What does a dip meter do?

(a) It gives an indication of the resonant frequency of a circuit

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A-003-003-003 What two ways could a dip meter be used in an amateur station? (a) To measure resonant frequencies of antenna traps and to measure a tuned circuit resonant frequency (b) To measure antenna resonance and impedance (c) To measure antenna resonance and percentage modulation (d) To measure resonant frequency of antenna traps and percentage modulation

A-003-003-003 What two ways could a dip meter be used in an amateur station? (a) To measure resonant frequencies of antenna traps and to measure a tuned circuit resonant frequency

A-003-003-004 A dip meter supplies the radio frequency energy which enables you to check: (a) the calibration of an absorption-type wavemeter (b) the impedance mismatch in a circuit (c) the adjustment of an inductor (d) the resonant frequency of a circuit

A-003-003-004 A dip meter supplies the radio frequency energy which enables you to check: (d) the resonant frequency of a circuit

A-003-003-005 A dip meter may not be used directly to: (a) measure the value of capacitance or inductance (b) align transmitter-tuned circuits (c) determine the frequency of oscillations (d) align receiver-tuned circuits

A-003-003-005 A dip meter may not be used directly to: (a) measure the value of capacitance or inductance

A-003-003-006 The dial calibration on the output attenuator of a signal generator: (a) reads accurately only when the attenuator is properly terminated (b) always reads the true output of the signal generator (c) reads twice the true output when the attenuator is properly terminated (d) reads half the true output when the attenuator is properly terminated

A-003-003-006 The dial calibration on the output attenuator of a signal generator: (a) reads accurately only when the attenuator is properly terminated

A-003-003-007 What is a signal generator? (a) A high-stability oscillator which can produce a wide range of frequencies and amplitudes (b) A low-stability oscillator which sweeps through a range of frequencies (c) A low-stability oscillator used to inject a signal into a circuit under test (d) A high-stability oscillator which generates reference signals at exact frequency intervals

A-003-003-007 What is a signal generator? (a) A high-stability oscillator which can produce a wide range of frequencies and amplitudes

A-003-003-008 A dip meter: (a) should be tightly coupled to the circuit under test (b) may be used only with series tuned circuits (c) accurately measures frequencies (d) should be loosely coupled to the circuit under test

A-003-003-008 A dip meter: (d) should be loosely coupled to the circuit under test

A-003-003-009 Which two instruments are needed to measure FM receiver sensitivity for a 12 dB SINAD ratio (signal + noise + distortion over noise + distortion)? (a) RF signal generator with FM tone modulation and a deviation meter (b) Calibrated RF signal generator with FM tone modulation and total harmonic distortion (THD) analyzer (c) Oscilloscope and spectrum analyzer (d) Receiver noise bridge and total harmonic distortion analyser

A-003-003-009 Which two instruments are needed to measure FM receiver sensitivity for a 12 dB SINAD ratio (signal + noise + distortion over noise + distortion)? (b) Calibrated RF signal generator with FM tone modulation and total harmonic distortion (THD) analyzer

A-003-003-010 The dip meter is most directly applicable to: (a) parallel tuned circuits (b) operational amplifier circuits (c) digital logic circuits (d) series tuned circuits

A-003-003-010 The dip meter is most directly applicable to: (a) parallel tuned circuits

A-003-003-011 Which of the following is not a factor affecting the frequency accuracy of a dip meter? (a) Hand capacity (b) Stray capacity (c) Over coupling (d) Transmitter power output

A-003-003-011 Which of the following is not a factor affecting the frequency accuracy of a dip meter? (d) Transmitter power output

A-003-004-001 What does a frequency counter do? (a) It measures frequency deviation (b) It generates broad-band white noise for calibration (c) It produces a reference frequency (d) It makes frequency measurements

A-003-004-001 What does a frequency counter do? (d) It makes frequency measurements

A-003-004-002 What factors limit the accuracy, frequency response and stability of a frequency counter? (a) Time base accuracy, temperature coefficient of the logic and time base stability (b) Number of digits in the readout, speed of the logic, and time base stability (c) Time base accuracy, speed of the logic, and time base stability (d) Number of digits in the readout, external frequency reference and temperature coefficient of the logic

A-003-004-002 What factors limit the accuracy, frequency response and stability of a frequency counter? (c) Time base accuracy, speed of the logic, and time base stability

A-003-004-003 How can the accuracy of a frequency counter be improved? (a) By using slower digital logic (b) By using faster digital logic (c) By improving the accuracy of the frequency response (d) By increasing the accuracy of the time base

A-003-004-003 How can the accuracy of a frequency counter be improved? (d) By increasing the accuracy of the time base

A-003-004-004 If a frequency counter with a time base accuracy of +/- 0.1 PPM (parts per million) reads 146 520 000 Hz, what is the most that the actual frequency being measured could differ from that reading? (a) 0.1 MHz (b) 1.4652 Hz (c) 14.652 Hz (d) 1.4652 kHz

A-003-004-005 If a frequency counter, with a time base accuracy of 10 PPM (parts per million) reads 146 520 000 Hz, what is the most the actual frequency being measured could differ from that reading? (a) 146.52 Hz (b) 146.52 kHz (c) 1465.2 kHz (d) 1465.2 Hz

A-003-004-006 The clock in a frequency counter normally uses a: (a) self-oscillating Hartley oscillator (b) mechanical tuning fork (c) free-running multivibrator (d) crystal oscillator

A-003-004-006 The clock in a frequency counter normally uses a: (d) crystal oscillator

A-003-004-007 The frequency accuracy of a frequency counter is determined by: (a) the size of the frequency counter (b) type of display used in the counter (c) the number of digits displayed (d) the characteristics of the internal time-base generator

A-003-004-007 The frequency accuracy of a frequency counter is determined by: (d) the characteristics of the internal time-base generator

A-003-004-008 Which device relies on a stable low-frequency oscillator, with harmonic output, to facilitate the frequency calibration of receiver dial settings? (a) Frequency-marker generator (b) Signal generator (c) Harmonic calibrator (d) Frequency counter

A-003-004-008 Which device relies on a stable low-frequency oscillator, with harmonic output, to facilitate the frequency calibration of receiver dial settings? (a) Frequency-marker generator

A-003-004-009 What is the traditional way of verifying the accuracy of a crystal calibrator? (a) Compare the oscillator with your transmitter (b) Use a dip-meter to determine the oscillator's fundamental frequency (c) Zero-beat the crystal oscillator against a standard frequency station such as WWV (d) Compare the oscillator with your receiver

A-003-004-009 What is the traditional way of verifying the accuracy of a crystal calibrator? (c) Zero-beat the crystal oscillator against a standard frequency station such as WWV

A-003-004-010 Out of the following oscillators, one is NOT, by itself, considered a high-stability reference: (a) temperature compensated crystal oscillator (TCXO) (b) voltage-controlled crystal oscillator (VCXO) (c) oven-controlled crystal oscillator (OCXO) (d) GPS disciplined oscillator (GPSDO)

A-003-004-010 Out of the following oscillators, one is NOT, by itself, considered a high-stability reference: (b) voltage-controlled crystal oscillator (VCXO)

A-003-004-011 You want to calibrate your station frequency reference to the WWV signal on your receiver. The resulting beat tone must be: (a) a combined frequency above both (b) the mathematical mean of both frequencies (c) of a frequency as low as possible and with a period as long as possible (d) at the highest audio frequency possible

A-003-004-011 You want to calibrate your station frequency reference to the WWV signal on your receiver. The resulting beat tone must be: (c) of a frequency as low as possible and with a period as long as possible

A-003-005-001 If a 100 Hz signal is fed to the horizontal input of an oscilloscope and a 150 Hz signal is fed to the vertical input, what type of pattern should be displayed on the screen? (a) A rectangular pattern 100 mm wide and 150 mm high (b) An oval pattern 100 mm wide and 150 mm high (c) A looping pattern with 3 horizontal loops, and 2 vertical loops (d) A looping pattern with 100 horizontal loops and 150 vertical loops

A-003-005-002 What factors limit the accuracy, frequency response and stability of an oscilloscope? (a) Accuracy of the time base and the linearity and bandwidth of the deflection amplifiers (b) Deflection amplifier output impedance and tube face frequency increments (c) Accuracy and linearity of the time base and tube face voltage increments (d) Tube face voltage increments and deflection amplifier voltages

A-003-005-002 What factors limit the accuracy, frequency response and stability of an oscilloscope? (a) Accuracy of the time base and the linearity and bandwidth of the deflection amplifiers

A-003-005-003 How can the frequency response of an oscilloscope be improved? (a) By using a crystal oscillator as the time base and increasing the vertical sweep rate (b) By increasing the vertical sweep rate and the horizontal amplifier frequency response (c) By using triggered sweep and a crystal oscillator for the timebase (d) By increasing the horizontal sweep rate and the vertical amplifier frequency response

A-003-005-003 How can the frequency response of an oscilloscope be improved? (d) By increasing the horizontal sweep rate and the vertical amplifier frequency response

A-003-005-004 You can use an oscilloscope to display the input and output of a circuit at the same time by: (a) measuring the input on the X axis and the output on the Y axis (b) measuring the input on the X axis and the output on the Z axis (c) utilizing a dual trace oscilloscope (d) measuring the input on the Y axis and the output on the X axis

A-003-005-004 You can use an oscilloscope to display the input and output of a circuit at the same time by: (c) utilizing a dual trace oscilloscope

A-003-005-005 An oscilloscope cannot be used to: (a) determine FM carrier deviation directly (b) measure frequency (c) measure DC voltage (d) determine the amplitude of complex voltage wave forms

A-003-005-005 An oscilloscope cannot be used to: (a) determine FM carrier deviation directly

A-003-005-006 The bandwidth of an oscilloscope is: (a) directly related to gain compression (b) indirectly related to screen persistence (c) a function of the time-base accuracy (d) the highest frequency signal the scope can display

A-003-005-006 The bandwidth of an oscilloscope is: (d) the highest frequency signal the scope can display

A-003-005-007 When using Lissajous figures to determine phase differences, an indication of zero or 180 degrees is represented on the screen of an oscilloscope by: (a) a horizontal straight line (b) an ellipse (c) a diagonal straight line (d) a circle

A-003-005-007 When using Lissajous figures to determine phase differences, an indication of zero or 180 degrees is represented on the screen of an oscilloscope by: (c) a diagonal straight line

A-003-005-008 A 100-kHz signal is applied to the horizontal channel of an oscilloscope. A signal of unknown frequency is applied to the vertical channel. The resultant wave form has 5 loops displayed vertically and 2 loops horizontally. The unknown frequency is: (a) 20 kHz (b) 40 kHz (c) 50 kHz (d) 30 kHz

A-003-005-009 An oscilloscope probe must be compensated: (a) when measuring a sine wave (b) through the addition of a high-value series resistor (c) every time the probe is usde with a different oscilloscope (d) when measuring a signal whose frequency varies

A-003-005-009 An oscilloscope probe must be compensated: (c) every time the probe is usde with a different oscilloscope

A-003-005-010 What is the best instrument to use to check the signal quality of a CW or single-sideband phone transmitter? (a) A sidetone monitor (b) An oscilloscope (c) A signal tracer and an audio amplifier (d) A field-strength meter

A-003-005-010 What is the best instrument to use to check the signal quality of a CW or single-sideband phone transmitter? (b) An oscilloscope

A-003-005-011 What is the best signal source to connect to the vertical input of an oscilloscope for checking the quality of a transmitted signal? (a) The RF signals of a nearby receiving antenna (b) The IF output of a monitoring receiver (c) The RF output of the transmitter through a sampling device (d) The audio input of the transmitter

A-003-005-011 What is the best signal source to connect to the vertical input of an oscilloscope for checking the quality of a transmitted signal? (c) The RF output of the transmitter through a sampling device

A-003-006-001 A meter has a full-scale deflection of 40 microamperes and an internal resistance of 96 ohms. You want it to read 0 to 1 mA. The value of the shunt to be used is: (a) 24 ohms (b) 4 ohms (c) 16 ohms (d) 40 ohms

A-003-006-001 A meter has a full-scale deflection of 40 microamperes and an internal resistance of 96 ohms. You want it to read 0 to 1 mA. The value of the shunt to be used is: (b) 4 ohms

A-003-006-002 A moving-coil milliammeter having a full-scale deflection of 1 mA and an internal resistance of 0.5 ohms is to be converted to a voltmeter of 20 volts full-scale deflection. It would be necessary to insert a: (a) series resistance of 1 999.5 ohms (b) series resistance of 19 999.5 ohms (c) shunt resistance of 19 999.5 ohms (d) shunt resistance of 19.5 ohms

A-003-006-003 A voltmeter having a range of 150 volts and an internal resistance of 150 000 ohms is to be extended to read 750 volts. The required multiplier resistor would have a value of: (a) 600 000 ohms (b) 1 500 ohms (c) 750 000 ohms (d) 1 200 000 ohms

A-003-006-004 The sensitivity of an ammeter is an expression of: (a) the resistance of the meter (b) the loading effect the meter will have on a circuit (c) the value of the shunt resistor (d) the amount of current causing full-scale deflection

A-003-006-004 The sensitivity of an ammeter is an expression of: (d) the amount of current causing full-scale deflection

A-003-006-005 Voltmeter sensitivity is usually expressed in ohms per volt. This means that a voltmeter with a sensitivity of 20 kilohms per volt would be a: (a) 50 microampere meter (b) 1 milliampere meter (c) 50 milliampere meter (d) 100 milliampere meter

A-003-006-005 Voltmeter sensitivity is usually expressed in ohms per volt. This means that a voltmeter with a sensitivity of 20 kilohms per volt would be a: (a) 50 microampere meter

A-003-006-006 The sensitivity of a voltmeter, whose resistance is 150 000 ohms on the 150-volt range, is: (a) 100 000 ohms per volt (b) 1000 ohms per volt (c) 10 000 ohms per volt (d) 150 ohms per volt

A-003-006-006 The sensitivity of a voltmeter, whose resistance is 150 000 ohms on the 150-volt range, is: (b) 1000 ohms per volt

A-003-006-007 The range of a DC ammeter can easily be extended by: (a) connecting an external resistance in series with the internal resistance (b) changing the internal inductance of the meter (c) connecting an external resistance in parallel with the internal resistance (d) changing the internal capacitance of the meter to resonance

A-003-006-007 The range of a DC ammeter can easily be extended by: (c) connecting an external resistance in parallel with the internal resistance

A-003-006-008 What happens inside a multimeter when you switch it from a lower to a higher voltage range? (a) Resistance is reduced in series with the meter (b) Resistance is reduced in parallel with the meter (c) Resistance is added in parallel with the meter (d) Resistance is added in series with the meter

A-003-006-008 What happens inside a multimeter when you switch it from a lower to a higher voltage range? (d) Resistance is added in series with the meter

A-003-006-009 How can the range of an ammeter be increased? (a) By adding resistance in series with the circuit under test (b) By adding resistance in parallel with the meter (c) By adding resistance in parallel with the circuit under test (d) By adding resistance in series with the meter

A-003-006-009 How can the range of an ammeter be increased? (b) By adding resistance in parallel with the meter

A-003-006-010 Where should an RF wattmeter be connected for the most accurate readings of transmitter output power? (a) One-half wavelength from the transmitter output (b) One-half wavelength from the antenna feed point (c) At the antenna feed point (d) At the transmitter output connector

A-003-006-010 Where should an RF wattmeter be connected for the most accurate readings of transmitter output power? (d) At the transmitter output connector

A-003-006-011 At what line impedance do most RF wattmeters usually operate? (a) 25 ohms (b) 100 ohms (c) 300 ohms (d) 50 ohms

A-003-006-011 At what line impedance do most RF wattmeters usually operate? (d) 50 ohms