NCTI Installer Tech Multiple Choice Part 1
(480 x 10^-5) / (60*10^-3) = A 8 x 10^-2 B 420 x 10^-1.67 C 8 x 10^-1.67 D 420 x 10 ^-2
A
A 1 mB decrease in a signal level of 40 dBmV is approxiamately equivalent to a decrease in a level of A 0.1 dB B 0.1 mB C 1 dB D 1 mB
A
A DC series circuit with R1 = 15 kilohms (kohms), R2 = 25 kohms, and R3 = 47 kohms has a total resistance of ____ ohms. A 87 kohms B 83 kohms C 95 kohms D 102 kohms
A
A number that compares an amount that is less than a whole to the whole amount is A Fraction B Percentage C Imaginary Number D Scientific Notation
A
A permanent-magnet loudspeaker A Has a cone that moves back and forth in relation to the varying current of the original sound B Has a cone that stays put in relation to the varying current of the original sound C Has a cone that moves back and forth in relation to the steady current of the original sound D Has a cone that stays put in relation to the steady current of the original sound
A
A signal increase of 1 dB represents a ____ increase in power. A 25.89% B 23.54% C 37.31% D 39.42%
A
Current: A Flow that is excessive for a specific size of conductor can cause the conductor to become too hot and melt of burn the conductor's insulating cover. B Flow that is within the limits for a specific size of conductor can cause the conductor to become too hot and melt of burn the conductor's insulating cover. C Flow that is excessive for a specific size of conductor will cause no damage. D Flow that is excessive for a specific size of insulator can cause the insulator to become too hot and melt of burn the insulator's conducting cover.
A
Excessive current flow: A Is often the result of the failure of a small part within a larger circuit. B Is often the result of the failure of a large part within a larger circuit. C Is often the result of the failure of a large part within a smaller circuit. D Is often the result of the failure of a small part within a smaller circuit.
A
How much signal is necessary from the subscriber's tap port @ 750 MHz to provide a minimum of 3 dBmB to the TV set when the drop is 150 ft of Series 6 cable and just one outlet (use 5.65/100ft)? A 11.5 B 14.5 C 8.5 D 6.5
A
In a DC series circuit A The same amount of current flows through each component B A different amount of current flows through each component C The same amount of current flows through each power source D A different amount of current flows through each power source
A
One-tenth bel or 1 dB is: A The 10th root of the 1 bel ratio B The 10th square of the 1 bel ratio C The 10th root of the 10 bel ratio D The 10th square of the 10 bel ratio
A
The ampere A Indicates how many coulombs pass a given point during the 1 second B The measurement of electrical resistance C The measurement of electromotive force D The measurement of the difference in potential between two charges
A
The circuit current is ____ amps in a DC series circuit where R = 40 ohms and E = 120 V. A 3 B 0.33 C 80 D -80
A
The major factor in determining whether a particular element is a conductor, semiconductor, or insulator is A The number of electrons in the valence shell B The number of neutrons in the nucleus C The number of positrons in the nucleus D The number of electron shells filled
A
The metal that has the greatest conductance is A Silver B Gold C Copper D Platinum
A
The power ratio for 2 dB is: A 1.585:1 B 0.783:1 C 2.428:1 D 0.526:1
A
The power source A Is the part of an electrical circuit that provides a difference of potential B Is the part of an electrical circuit that provides no difference of potential C Is the part of an electrical circuit that provides a path for the current to travel on D Is the part of an electrical circuit that provides a small potential
A
The proper operation of a leakage detector in a monitoring vehicle be _______ by creating a _________. A verified, test leak B eliminated, test leak C verified, major leak D eliminated, major leak
A
The square of 7 = A 49 B 2.65 C 14 D 2,401
A
The strength of an electromagnetic field is A Determined by the magnitude of the magnetomotive force B Determined by number of valence electrons in the wire C Determined by the number of valence electrons in the metal bar D Determined by the magnitude of the mass
A
What are the three basic elements of an electrical circuit? A A power source, a load, and the connecting conductors B A power source, a conductor, and an outlet C An origin, a load, and the connecting conductors D An origin, an outlet, and the connecting conductors
A
What is the total DC loop resistance of a 350ft piece of series 59 drop cable when the DC loop resistance of that series 59 cable is 56.04 ohms p/1,000 ft? A 19.614 B 18.783 C 17.402 D 20.919
A
What unit of measure is used to identify the field strength of electromagnetic radiation (signal leakage)? A Microvolts/meter (uV/m) B Millivolts/meter (uV/m) C Microvolts/millimeter (uV/m) D Millivolts/millimeter (uV/m)
A
Which of the following is a correct definition for a type of circuit graphic? A A block diagram is a simplified outline of an electrical system that shows circuits or parts as rectangles and other shapes B A block diagram is a complicated outline of an electrical system that shows circuits or parts as their true shape C A block diagram is a simplified outline of an electrical system that shows circuits or parts as their true shape D A block diagram is a complicated outline of an electrical system that shows circuits or parts as rectangles and other shapes
A
Which of the following is a true axiom? A When A = C and B = C, then A = B because both are equal to C, Which supports the axiom: Quantities equal to the same quantity are equal to each other. B When A = D and B = C, then A = B because both are equal to C and D, Which supports the axiom: Quantities equal to the same quantity are equal to each other. C When A = C, B = E, and C = D, then A = B because both are equal to C, Which supports the axiom: Quantities equal to the same quantity are equal to each other. D When A = C and B = C, then A cannot equal B because both are equal to C, Which supports the axiom: Quantities equal to the same quantity are not equal to each other.
A
Which of the following is true? A The total resistance (RT) of a DC series circuit is the sum of the individual resistances in the circuit (RS+RW+RL) B The total resistance (RT) of an AC series circuit is the sum of the individual resistances in the circuit (RS+RW+RL) C The total resistance (RT) of a DC series circuit is the sum of the individual resistances in the circuit (RT+RQ+RS) D The total resistance (RT) of a AC series circuit is the sum of the individual resistances in the circuit (RT+RQ+RS)
A
____ watts of power are consumed in a circuit with an applied voltage of 60 volts and a load of 150 ohms. A 24W B 32W C 15W D 9W
A
(75 x 10^3) + (2.5 x 10^4) = A 77.5 x 10^4 B 100 x 10^3 C 100 x 10^4 D 77.5 x 10^3
B
1:5 ratio is equal to: A 15% B 20% C 25% D 30%
B
5 kilovolts is the same as A 50 kV B 5 kV C 0.5 mV D 5 MV
B
According to the FCC, leaks ____ and above measured ____ feet from the cable must be logged and repaired. A 10 uV/m, 10 B 20 uV/m, 10 C 30 uV/m, 10 D 40 uV/m, 10
B
An input-to-output power ratio of 10:1 has an input-to-output voltage ratio of: A 3.162:1, the square of the power ratio B 3.162:1, the square root of the power ratio C 3:1, the square root of the power ratio D 3:1, the square of the power ratio
B
Convert 0.893 volts into a power of 10 and metric prefix form: A 893 x 10^3V = 893 mV B 893 x 10^-3V = 893 mV C 893 x 10^-3V = 893 kV D 893 x 10^3V = 893 kV
B
Direct current: A Flow is intermittent electron flow in the same direction B Flow is continuous electron flow in the same direction C Flow is continuous electron flow in the opposite direction D Flow is intermitten electron flow in the opposite direction
B
Electrical current is actually produced by A The transfer of energy from positrons to valence electrons as a result of applied charges B The transfer of energy from valence electron to valence electron as a result of applied charges C The transfer of energy from positrons to positrons as a result of withdrawn charges D The transfer of energy from valence electron to valence electron as a result of withdrawn charges
B
Elements that are called conductors have A No valence electrons B Very few valence electrons C Half of the maximum capacity of valence electrons D Completely full valence electrons
B
How can an installer control the resistance of the drop cable being installed at the customer premise? A Install series 59 cable instead of a series 6 cable because series 59 is larger in diameter with lower resistance, than a series 6 cable. B Install series 6 cable instead of series 59 cable because series 6 cable is larger diameter, with lower resistance, than series 59 cable. C Install series 6 cable instead of series 59 cable because series 6 cable is smaller diameter, with lower resistance than series 59 cable. D Install series 6 cable instead of series 59 cable because series 6 cable is smaller diameter, with higher resistance than series 59 cable.
B
How much signal is needed from the subscriber's tap port @ 750 MHz to provide a minimum of +3 dBmV to each of the TV sets when there is a 132 ft of series 6 cable and a 2-way splitter (5.65/100 ft & 4 db for splitter)? A 12.5 dBmV B 14.5 dBmV C 16.5 dBmV D 18.5 dBmV
B
IT = ____ amps in a DC series circuit where R1 = 10 ohms, R2 = 20 ohms, R3 = 30 ohms, R4 = 40 ohms, and ET = 50 V. A 0.25 B 0.5 C 1 D 1.25
B
Load resistance: A Is considered to be the total resistance when the source and wire resistances are very large B Is considered to be the total resistance when the source and wire resistances are very small C Is considered to be half of the total resistance when the source and wire resistances are very small D Is considered to be half of the resistance when the source and wire resistances are very large
B
Magnetism A Was discovered when the Greeks noticed that magnetite always aligned itself in a west and east direction B Was discovered when the Greeks noticed that magnetite always aligned itself in a north and south direction C Was discovered when the Romans noticed that magnetite always aligned itself in a north and south direction D Was discovered when the Romans noticed that magnetite always aligned itself in a west and east direction
B
R2 = ____ ohms in a DC series circuit where R1 = 33 ohms, R3 = 47 ohms, R4 = 56 ohms, and RT = 197 ohms? A 57 B 61 C 74 D 89
B
The FCC requires the use of a ____ antenna for the measurement of a signal leakage for logging and Cumulative Leakage Index A Unipole B Dipole C Tripole D Tetripole
B
The left-hand rule for electromagnetism in a wire state that A If you wrap the fingers of your right hand around the wire with your thumb pointing in the direction of the current flow, your fingers will be wrapped in the direction of the magnetic field B If you wrap the fingers of your left hand around the wire with your thumb pointing in the direction of the current flow, your fingers will be wrapped in the direction of the magnetic field C If you wrap the fingers of your left hand around the metal bar with your thumb pointing in the direction of the current flow, your fingers will be wrapped in the direction of the magnetic field D If you wrap the fingers of your right hand around the metal bar with your thumb pointing in the direction of the current flow, your fingers will be wrapped in the direction of the magnetic field
B
The letter and symbol designation for current is ____ and ____, respectively. A A and I B I and A C E and I D A and E
B
The square root of 81 = A 40.5 B 9 C 6,561 D 162
B
Values expressed in dBmV progress in a nonlinear fashion when compared to a linear millivolt scale because A They are based on the algorithms of power ratios B They are based on the logarithms of power ratios C They are based on the algorithms of decimal ratios D They are based on the logarithms of decimal ratios
B
Values expressed in dBmV that are preceded by a minus sign represent A Values of voltage more than 1 millivolt across 75 ohms B Values of voltage less than 1 millivolt across 75 ohms C Values of voltage more than 1 millivolt across 150 ohms D Values of voltage less than 1 millivolt across 150 ohms
B
What is the total voltage of a DC series circuit where ER1 = 20V, ER2 = 45V, and ER3 = 57V? A 137V B 122V C 170V D 153V
B
What is the voltage in a circuit with 0.8 ampere of current and 100 ohms of resistance? A 8V B 80V C 0.8V D 0.08V
B
What signal leakage information and measurements must be included with the annual reporting to the FCC? A Information carried on signals in the subnautical bandwidths B Information carried on transmitters in the aeronautical bandwidths C Information carried on signals in the subnautical bandwidths D Information carried on transmitters in the aeronautical bandwidths
B
When the cross-sectional area of a conductor doubles, A Its resistance increases to half its original value B Its resistance decreases to half its original value C Its resistance decreases to double its original value D Its resistance decreases to quarter its original value
B
Which of the following are the aeronautical frequency bands?\ A 98-127 & 225-400 B 108-137 & 225-400 C 98-127 & 235-410 D 108-137 & 235-410
B
Why is a leakage detector preferable to a signal level meter (SLM) for detecting leakage? A A leakage detector has an increased sensitivity to strong signals B A leakage detector has an increased sensitivity to weak signals C A leakage detector has an decreased sensitivity to strong signals D A leakage detector has an decreased sensitivity to weak signals
B
(75 x 10^3) + (25 x 10^4) = A 100 x 10^3 B 50 x 10^4 C 32.5 x 10^4 D 87.5 x 10^3
C
10 to the power of -3 has a metric prefix of ____. A Mega B Nano C Milli D Centi
C
20 milliamperes is the same as _________ amperes. A 2 B 0.2 C 0.02 D 0.002
C
A lightbulb is consuming 60 watts of power with 0.9 amperes of current flowing through it. What is the bulb's resistance? A 57.29 ohms B 93.12 ohms C 74.07 ohms D 82.73 ohms
C
A signal increase of 1 dB represents a ____ increase in power. A 36.73% B 29.47% C 25.89% D 41.85%
C
Across which resistor in a DC series circuit where R1 = 25 ohms, R2 = 50 ohms, R3 = 75 ohms, and R4 = 10 ohms is the greatest voltage drop? A R1 B R2 C R3 D R4
C
An ohmmeter should be connected: A Across a resistor that is connected from the circuit voltage source B Across a transformer that is connected from the circuit voltage source C Across a resistor that is disconnected from the circuit voltage source D Across a transformer that is disconnected from the circuit voltage source
C
Flux lines A Never curve around through the body of the magnet to form complete loops B Always curve around through the body of the magnet to form half loops C Always curve around through the body of the magnet to form complete loops D Sometimes curve around through the body of the magnet to form half loops
C
In a magnetic material A Where all of the magnetic domains are pointing in the same direction, the magnetic field is weaker B Where only some of the magnetic domains are pointing in the same direction, the magnetic field is stronger C Where only some of the magnetic domains are pointing in the same direction, the magnetic field is weaker D Where all of the magnetic domains are pointing in the opposite direction, the magnetic field is weaker
C
Ingress is ______ leaking into the ______ system A Signals, outlet B Watts, cable C Signals, cable D Watt, outlet
C
Normal current flow results A When the circuit operates improperly and no damage occurs to the circuit components B When the circuit operates improperly and damage occurs to the circuit components C When the circuit operates properly and no damage occurs to the circuit components D When the circuit operates properly and damage occurs to the circuit components
C
Resistance: A Doubles when the length of a conductor halves B Halves when the length of a conductor doubles C Doubles when the length of a conductor doubles D Doubles when the length of a conductor quadruples
C
The input-to-output power ratio for 2 bels of similar impedance cable is: A 25:1 B 50:1 C 100:1 D 150:1
C
The length of coaxial cable that has an attenuation of 10 db will experience an input RF signal power loss of ____, with ____of the signal remaining. A 55%/35% B 60%/50% C 90%/10% D 95%/15%
C
The load A Is the part of the electrical circuit that uses the electrical energy provided by the load to carry out some desired function B Is the part of the electrical circuit that uses the electrical energy provided by the connecting conductors to carry out some desired function C Is the part of the electrical circuit that uses the electrical energy provided by the power source to carry out some desired function D Is the part of the electrical circuit that uses the electrical energy provided by the power source to carry out all of the functions
C
The orbital shell that has a maximum capacity of 18 valence electrons is the ________ shell. A First B Second C Third D Fourth
C
The recording head of a tape recorder is actually (a)n A Filament B Battery C Electromagnet D Speaker
C
The resistance of a conductor increases as: A The cross-sectional area of a conductor increases. B The circular area of a conductor decreases. C The cross-sectional area of a conductor decreases. D The circular areas of a conductor increases.
C
The term "bel" originated with the early days of A Bell B Ring C Telephone D Dial
C
Values expressed in dBmV progress in a nonlinear fashion when compared to a linear millivolt scale because A Values of voltage less than 1 microvolt across 75 ohms B Values of voltage less than 1 millivolt across 150 ohms C Values of voltage less than 1 millivolt across 75 ohms D Values of voltage less than 1 microvolt across 75 ohms
C
What is the purpose of a tagger when detecting and measuring signal leakage? A A tagger will ensure any leak measured emanates from the outlet system B A tagger will ensure any leak measured is concealed from the outlet system C A tagger will ensure any leak measured emanates from the cable system D A tagger will ensure any leak measured is concealed from the cable system
C
(250 x 10^-6) - (7 x 10^-5)= A 243 x 10^-5 B 180 x 10^-5 C 243 x 10^-6 D 180 x 10^-6
D
0.00004 = ____ x 10 to the power of ____. A 4, -4 B 4, -5 C. 4, 4 D 4, -5
D
A conductor provides a ___ for the current flow from the power source to the load and from the load back to the ___ A current, load B path, load C current, power source D path, power source
D
A fraction is converted to a percent by dividing the ______ by the denominator and multiplying by _____. A Denominator, 50 B Numerator, 50 C Denominator, 100 D Numerator, 100
D
A semiconductor material has ___ valence electron(s) A 1 B 2 C 3 D 4
D
A symbol: A Is a complex line design used to represent a component or device in a schematic circuit diagram. B Is a simple line design used to represent a component or device in a block diagram. C Is a complex line design used to represent a component or device in a block diagram. D Is a simple line design used to represent a component or device in a schematic circuit diagram.
D
ER2 = ____ volts in a DC series circuit where R1 = 150 ohms, R2 = 150 ohms, R3 = 550 ohms, IT = 0.2 amperes. A 15 B 20 C 25 D 30
D
How much current would an applied voltage of 60 volts cause in a circuit of 300 ohms of resistance? A 200 A B 2 A C 20 A D 0.2 A
D
Magnetic poles that are ____ will ____ each other when those poles are near each other. A Alike, attract B Dissimilar, repel C Alike, have no affect on D Alike, repel
D
Simplify and solve the equation: If E = IR then what is the formula for finding I? A I = R/E B R = E/I C R = I/E D I = E/R
D
The input-to-output power ratio of a coaxial cable that has 1 dB of attenuation is: A 2.51782 : 2 B 2.51782 : 1 C 1.25891 : 2 D 1.25891 : 1
D
The magnetic field A Created by a straight piece of wire is stronger than that created by forming loops of wire B Created by an outlet is weaker than that created by a battery C Created by a battery is weaker than that created by an outlet D Created by a straight piece of wire is weaker than that created by forming loops of wire
D
The term voltage usually refers to A Indicates how many coulombs pass a given point during the 1 second B The measurement of electrical resistance C The measurement of electromotive force D The measurement of the difference in potential between two charges
D
The total DC loop resistance of a 1,850-foot piece of 0.500-inch coaxial cable, with a DC loop resistance of 1.34 ohms p/1,000 ft, is ____ ohms. A 24.79 B 37.27 C 3.727 D 2.479
D
Through which resistor in a DC series circuit where R1 = 10 ohms, R2 = 15 ohms, R3 = 20 ohms, and R4 = 5 ohms is the greatest current flowing? A R3 > R2 > R1 > R4 B R4 > R1 > R2 > R3 C They all have different amounts of current flowing through them D They all have the same amount of current flowing through them
D
To create an electromagnet A Wrap a coil of uninsulated wire around an iron bar and pass an electric current through the wire B Wrap a coil of insulated wire around a copper bar and pass an electric current through the wire C Wrap a coil of uninsulated wire around an iron bar and pass an electric current through the wire D Wrap a coil of insulated wire around an iron bar and pass an electric current through the wire
D
Voltage is: A A measurement of the force or pressure that causes positrons to move. B A measurement of the force or pressure that causes atoms to move. C A measurement of the force or pressure that causes neutrons to move. D A measurement of the force or pressure that causes electrons to move.
D
What are the FCC requirements regarding leakage monitoring? A Quarterly reporting and annual monitoring B Quarterly monitoring and annual monitoring C Quarterly reporting and annual reporting D Quarterly monitoring and annual reporting
D
What are the units that can be used to represent signal level values? A MV, BdmV, & uW or nW B MV, dBmV, & uW or nW C mV, BdmV, & uW or nW D mV, dBmV, & uW or nW
D
What does 0 dBmV equal A 3 mV across 150 ohms B 2 mV across 75 ohms C 1 mV across 150 ohms D 1 mV across 75 ohms
D
What is the max tap value that can be installed when the tap is connected directly to a line extender amplifier output and: (1) the line extender output is 45 dBmV @ 745.25 MHz; (2) the longest amount of Series 6 coaxial cable from the tap to either of the two TV sets is 150 ft; (3) the Series 6 coaxial cable attenuation rate is 5.65/100ft @ 750 MHz; (4) the drop includes a splitter with a 4.0 dB loss; and (5) the minmum signal level required at each of the two TV sets is 3.0 dBmV? A 20 dB B 23 dB C 26 dB D 29 dB
D
What prevents the electrons that orbit an atom's nucleus at high speeds from breaking away from the nucleus due to centrifugal force? A The repulsion between the positive nucleus and the negative electrons B The repulsion between the neutral nucleus and the negative electrons C The attraction between the neutral nucleus and the negative electrons D The attraction between the positive nucleus and the negative electrons
D
When the output of a line extender is 3 dB lower than it normally should be A The signal is 2 dB lower than normal from that point back. B The signal is 3 dB lower than normal from that point back. C The signal is 2 dB higher than normal from that point on. D The signal is 3 dB lower than normal from that point on.
D
Which of the following is true? A The resistance of a material with a negative temperature coefficient will increase as the temperature increases. B The resistance of a material with a negative temperature coefficient will decrease as the temperature decrease. C The resistance of a material with a positive temperature coefficient will decrease as the temperature increases. D The resistance of a material with a negative temperature coefficient will decrease as the temperature increases.
D
____ kilowatt-hours (kWh) would be supplied by a standby power supply that provides 60 volts and 10 amperes of current for a period of 3 ½ hours. A 4.0 kWh B 3.6 kWh C 2.7 kWh D 2.1 kWh
D
____ ohms of resistance is required for a circuit with an applied voltage of 30 volts and a circuit current of 1.3 amperes. A 22.303 B 22.963 C 24.628 D 23.076
D