RCDD Chapter 9
In this quiz, the ninth chapter of our quizzes on the Registered Communications Distribution Designer certification, we’ll determine once and for all if you know all there is to know about the engineering-oriented credential offered by BICSI.
- 1.
Electrical shock can cause:
- A.
Your hair to stand up
- B.
You to travel through time
- C.
Injury and death
- D.
The winning lottery numbers to appear before your eyes
Correct Answer
C. Injury and death -
- 2.
Frequency (e.g. number of sine wave cycles in one second) is typically ________ depending on the country.
- A.
30 to 40 Hz
- B.
45 to 60 Hz
- C.
50 to 60 Hz
- D.
55 to 75 Hz
Correct Answer
C. 50 to 60 Hz -
- 3.
A method of connection for primary or secondary windings of a three-phase tranformer bank in which similar ends of each phase windings are connected together at a common point is known as:
- A.
Delta
- B.
Wye
- C.
Phase joining
- D.
Patch
Correct Answer
B. Wye -
- 4.
A method of connection for primary or secondary windings of a three-phase transformer bank in which the windings are connected in series to form a closed circuit is known as:
- A.
Delta
- B.
Wye
- C.
Phase joining
- D.
Patch
Correct Answer
A. Delta -
- 5.
If tow waveforms match each other in electrical degrees, they are said to be:
- A.
Leading each other by 90 degrees
- B.
Out of phase
- C.
In phase
- D.
Voltage concurrent
Correct Answer
C. In phase -
- 6.
Ohm's law states that:
- A.
V=IR
- B.
R=VI
- C.
R=V/I
- D.
I=RV
Correct Answer(s)
A. V=IR
C. R=V/I -
- 7.
When using ohms law V, I, and R respresent what:
- A.
V= voltage in volts
- B.
I = inductance in henries
- C.
R= resistance in watts
- D.
R= resistance in ohms
- E.
I= current in amperes
Correct Answer(s)
A. V= voltage in volts
D. R= resistance in ohms
E. I= current in amperes -
- 8.
The formula for Ohm's law always applies to ____ circuits.
- A.
AC
- B.
DC
- C.
AC and DC
Correct Answer
B. DC -
- 9.
The formula for Ohms law only applies to _____ circuits that are purely resistive.
- A.
AC
- B.
DC
- C.
AC and DC
Correct Answer
A. AC -
- 10.
Power is an important characteristic of ac circuits. In AC circuits that are purely _______, the current and voltage sine waves are in phase.
- A.
Capacitive
- B.
Inductive
- C.
Resistive
- D.
Voltage
Correct Answer
C. Resistive -
- 11.
If the voltage sine wave starts before the current sine wave (inductive circuit) then the current wave is said to:
- A.
Be in phase
- B.
Lead the voltage sine wave
- C.
Lage the voltage sine wave
Correct Answer
C. Lage the voltage sine wave -
- 12.
If the voltage sine wave starts after the current sine wave (capacitive load) then the current wave is said to:
- A.
Be in phase
- B.
Lead the voltage sine wave
- C.
Lage the voltage sine wave
Correct Answer
B. Lead the voltage sine wave -
- 13.
What is the product of the measured voltage and measured amperage called?
- A.
Real power (measured on the load side and expressed in W)
- B.
Apparent power (measured on the line side and expressed in VA)
- C.
Ratio of power (expressed as a fraction)
- D.
Power factor (expressed as a decimal)
Correct Answer
B. Apparent power (measured on the line side and expressed in VA) -
- 14.
What is determined by incorporating the effects of the inductive and capacitive reactance into the calculation of the product of measured voltage and measured amperage.
- A.
Real power (measured on the load side and expressed in W)
- B.
Apparent power (measured on the line side and expressed in VA)
- C.
Ratio of power (expressed as a fraction)
- D.
Power factor (expressed as a decimal)
Correct Answer
A. Real power (measured on the load side and expressed in W) -
- 15.
The ratio of real power to apparent power is a percentage and is called the ________.
- A.
Power ratio
- B.
Power variance
- C.
Power factor
- D.
Power difference
Correct Answer
C. Power factor -
- 16.
Utility companies charge for power in ___________.
- A.
Megawatt hours (MWh)
- B.
Watt hours (Wh)
- C.
Kilowatt hours (kWh)
- D.
Gigawatt hours (GWh)
Correct Answer
C. Kilowatt hours (kWh) -
- 17.
One kWh is equal to:
- A.
10 watt hours
- B.
100 watt hours
- C.
1000 watt hours
- D.
10000 watt hours
Correct Answer
C. 1000 watt hours -
- 18.
How many Btu equal one ton of air conditioning to adequetely cool an area
- A.
10,000 Btu
- B.
12,000 Btu
- C.
15,000 Btu
- D.
20,000 Btu
Correct Answer
B. 12,000 Btu -
- 19.
The efficiency of a circuit (or load) is the amount of input power required to provide a predetermined output power, expressed as a:
- A.
Decimal
- B.
Percentage
- C.
Fraction
Correct Answer
B. Percentage -
- 20.
When using the American Wire Gauge (AWG) numbering system, smaller numbers denote _______ wires.
- A.
Larger
- B.
Smaller
Correct Answer
A. Larger -
- 21.
Stranded conductors generally have a slightly ___________ outside diameter than the corresponding solid conductor diameter due to the additional cross-sectional area between the strands.
- A.
Larger
- B.
Smaller
Correct Answer
A. Larger -
- 22.
The ________ of a conductor is related to the conductor size, temperature, and means of insulation.
- A.
Size
- B.
Ampacity
- C.
Efficiency
- D.
Power factor
Correct Answer
B. Ampacity -
- 23.
With reference to voltage and current fluctuations, what is a short duration (usually subcycle) rapid increase in voltage or current that can often be up to thousands of volts in amplitude. The duration is less than half cycle (8.3 milliseconds) of the normal voltage waveform.
- A.
Swell
- B.
Transients/Surge
- C.
Sag
- D.
Overvoltage
- E.
Interruption
Correct Answer
B. Transients/Surge -
- 24.
With reference to voltage and current fluctuations, what is an increase in the nominal voltage or current lasting from 0.5 cycles to one minute?
- A.
Sag
- B.
Overvoltage
- C.
Swell
- D.
Transient/Surge
- E.
Interruption
Correct Answer
C. Swell -
- 25.
With reference to voltage and current fluctuations, what is a decrease in the nominal voltage or current lasting 0.5 cycles up to one minute?
- A.
Undervoltage
- B.
Interruption
- C.
Swell
- D.
Sag
- E.
Overvoltage
Correct Answer
D. Sag -
- 26.
With reference to voltage and current fluctuations, what is an increase in the nominal voltage for more than 3600 cycles (one minute)
- A.
Transients/Surge
- B.
Swell
- C.
Overvoltage
- D.
Sag
- E.
Interruption
Correct Answer
C. Overvoltage -
- 27.
With reference to voltage and current fluctuations, what is a total absence of voltage on one or more phase conductors for a period of time?
- A.
Interruption
- B.
Sag
- C.
Overvoltage
- D.
Swell
- E.
Surge
Correct Answer
A. Interruption -
- 28.
With reference to voltage and current fluctuations, what is a decrease in the nominal voltage for more than 3600 cycles (one minute)
- A.
Overvoltage
- B.
Sag
- C.
Undervoltage
- D.
Interruption
- E.
Swell
Correct Answer
C. Undervoltage -
- 29.
The harmonics of the sine wave are multiples of the basic __________. (e.g. the third harmonic of 60 Hz power is 180 Hz)
- A.
Voltage
- B.
Amplitude
- C.
Frequency
- D.
Current
Correct Answer
C. Frequency -
- 30.
What equipment along with electronic ballasts generally cause harmonics?
- A.
Transmitting equipment
- B.
Solid-state equipment
- C.
Recieving equipment
- D.
Grounding equipment
Correct Answer
B. Solid-state equipment -
- 31.
It is recommend that voice and data equipment utilize isolated ground (IG) systems.
- A.
True
- B.
False
Correct Answer
B. False -
- 32.
What adjusts the line voltage to the load up or down, as necessary.
- A.
Voltage amplifier
- B.
Voltage conditioner
- C.
Voltage regulator
- D.
Voltage filter
Correct Answer
C. Voltage regulator -
- 33.
What is used to reduce voltage waveform distortion.
- A.
Power line conditioners
- B.
Voltage regulators
- C.
Harmonic filters
- D.
All the above
Correct Answer
C. Harmonic filters -
- 34.
Harmonic filters are used to reduce voltage waveform distortion that affects what:
- A.
Power supplies in equipment
- B.
Sensitive electronic equipment
- C.
Transmitting devices
- D.
Receiving devices
Correct Answer
B. Sensitive electronic equipment -
- 35.
What provides electrical isolation from the utility line by using the utility to drive a motor, which in turn drives a generator, producing an AC waveform at the desired voltage
- A.
Motor generator
- B.
Engine generator
- C.
Off-line UPS
- D.
Line-interactive UPS
Correct Answer
A. Motor generator -
- 36.
What uses a fuel-powered engine to drive a rotary generator?
- A.
Motor generator
- B.
Engine generator
- C.
Off-line UPS
- D.
Line-interactive UPS
Correct Answer
B. Engine generator -
- 37.
Direct current (DC) is ___________, and unlike AC current does not change polarity.
- A.
Unidirectional
- B.
Bidirectional
- C.
Omnidirectional
Correct Answer
A. Unidirectional -
- 38.
For telecommunications, the nominal operating voltage in the U.S. is:
- A.
-24 volts
- B.
+24 volts
- C.
-48 volts
- D.
+48 volts
Correct Answer
C. -48 volts -
- 39.
For cellular radio, the nominal operating voltage is:
- A.
-24 volts
- B.
+24 volts
- C.
-48 volts
- D.
+48 volts
Correct Answer
B. +24 volts -
- 40.
As part of a DC system, a rectifier/charger does what:
- A.
Contains system distribution fuses and/or circuit breakers
- B.
Rectifies the ac input to dc
- C.
Monitors the equipment
- D.
Charges the battery
Correct Answer(s)
B. Rectifies the ac input to dc
D. Charges the battery -
- 41.
What is typically fitted with transfer circuits to transfer ac loads to utility ac power if there is a failure.
- A.
Rectifier/charger
- B.
Switchboard
- C.
Battery
- D.
Inverter
- E.
Low-voltage disconnect (LVD)
Correct Answer
D. Inverter -
- 42.
What is a device that is used to disconnect the battery at a preset voltage during battery discharge and allow reconnection only when utility power has been restored.
- A.
Load sharing device
- B.
Low-voltage disconnect (LVD)
- C.
Battery monitor
- D.
Rectifier/charger
Correct Answer
B. Low-voltage disconnect (LVD) -
- 43.
When installing a DC system, what are the two most important aspects of planning:
- A.
Battery capacity
- B.
Power flow
- C.
Clearances
- D.
Current requirements
Correct Answer(s)
B. Power flow
C. Clearances -
- 44.
Do not mix aluminum terminating devices with copper cables.
- A.
True
- B.
False
Correct Answer
A. True -
- 45.
Batteries store electricity.
- A.
True
- B.
False
Correct Answer
B. False -
- 46.
Batteries store energy in:
- A.
Electrical form
- B.
Physical form
- C.
Chemical form
- D.
Reactive form
Correct Answer
C. Chemical form -
- 47.
What are the three main types of battery cells used in telecommunications applications:
- A.
Alkaline
- B.
Flooded lead-acid (FLA)
- C.
Valve regulated lead-acid (VRLA)
- D.
Wet cells
- E.
Sealed cells
Correct Answer(s)
A. Alkaline
B. Flooded lead-acid (FLA)
C. Valve regulated lead-acid (VRLA)
D. Wet cells
E. Sealed cells -
- 48.
The capacity of a cell depends on what two factors
- A.
Size of the cell plates
- B.
Charge time of the plates
- C.
Quantity of cell plates
- D.
Type of cell plates
Correct Answer(s)
A. Size of the cell plates
C. Quantity of cell plates -
- 49.
How can cells be connected to increase battery capacity.
- A.
In series
- B.
In parallel
- C.
In harmony
Correct Answer
B. In parallel -
- 50.
What is the most common type of alkaline cell:
- A.
Wet cell
- B.
Sealed cell
- C.
NiCd cell
- D.
Lead-acid cell
Correct Answer
C. NiCd cell -
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Mar 14, 2022Quiz Edited by
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Mar 02, 2009Quiz Created by
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