NICET LEVEL 1 FIRE ALARM |
COMPREHENSIVE QUESTIONS AND
ANSWERS
what does NAC stand for? - Answer-notification appliance circuit
nacs are connected to output or input side of control panel? - Answer-output
Two identical batteries connected in series will - Answer-double the voltage but the
amp-hour capacity will only be as high as the smallest battery
Two identical batteries connected in parallel will result in - Answer-no change in voltage,
but the amp-hour capacity will be the sum of the two batteries
Transformer - Answer-An electrical device that converts or transforms alternating
current (AC) voltage from one value to another value utilizing electromagnetic induction.
step-up transformer - Answer-a transformer that increases voltage and decreases
current
step-down transformer - Answer-a transformer that decreases voltage and increases
current
A primary winding has __________ turns. - Answer-100
A secondary winding has __________ turns. - Answer-200
Diode - Answer-A ____ is a device which only allows current to flow through it in one
direction.
Rectifier - Answer-A ______ converts an AC waveform into a DC waveform
What are the two different kinds of rectifier circuits? - Answer-Half-wave and Full-wave
half-wave rectifier - Answer-simplest rectifier, uses one single diode
Half-wave rectification - Answer-When the AC input is positive, the diode is forward-
biased and lets the current through.
When the AC input is negative, the diode is reverse-biased and the diode does not let
any current through, meaning the output is 0V.
, Because there is a 0.7V voltage loss across the diode, the peak output voltage will be
0.7V less than Vs.
Full wave rectification - Answer-When the AC input is positive, diodes A and B are
forward-biased, while diodes C and D are reverse-biased.
When the AC input is negative, the opposite is true...diodes C and D are forward-
biased, while diodes A and B are reverse-biased.
While the full-wave rectifier is an improvement on the half-wave rectifier, its output still
isn't suitable as a power supply for most circuits, since the output voltage still varies
between 0V and Vs-1.4V. So, if you put 24V AC in, you will get 22.6 V DC out.
Resistor - Answer-A ______is an electrical component that limits or regulates the flow of
electrical current in an electronic circuit
Capacitor - Answer-A_______ is a passive electronic component that stores energy in
the form of an electrostatic field
Capacitor (in simpler terms) - Answer-a capacitor consists of two conducting plates
separated by an insulating material called the dielectric.
The standard unit of capacitance is? - Answer-Farad, abbreviated F.
A diode is a specialized electronic component with two electrodes called - Answer-the
anode and the cathode
LED - Answer-The ___ is based on the semiconductor diode
Electroluminescence - Answer-This is an effect called _____ and the color of the light
(corresponding to the energy of the photon) is determined by the energy gap of the
semiconductor.
When a diode is forward biased (switched on), electrons are able to recombine with
holes within the device, releasing energy in the form of photons.
Transitor - Answer-A _______ is a semiconductor device used to amplify and switch
electronic signals.
TRIAC or Triode for Alternating Current - Answer-A _______ is an electronic component
approximately equivalent to two silicon-controlled rectifiers (SCRs/thyristors) joined in
inverse parallel (paralleled but with the polarity reversed) and with their gates connected
together.
OSHA - Answer-The Occupational Safety and Health Act (OSH Act) is the primary
federal law which governs occupational health and safety in the private sector and
federal government in the United States. Its main goal is to ensure employers provide
employees with an environment free from recognized hazards, such as exposure to
COMPREHENSIVE QUESTIONS AND
ANSWERS
what does NAC stand for? - Answer-notification appliance circuit
nacs are connected to output or input side of control panel? - Answer-output
Two identical batteries connected in series will - Answer-double the voltage but the
amp-hour capacity will only be as high as the smallest battery
Two identical batteries connected in parallel will result in - Answer-no change in voltage,
but the amp-hour capacity will be the sum of the two batteries
Transformer - Answer-An electrical device that converts or transforms alternating
current (AC) voltage from one value to another value utilizing electromagnetic induction.
step-up transformer - Answer-a transformer that increases voltage and decreases
current
step-down transformer - Answer-a transformer that decreases voltage and increases
current
A primary winding has __________ turns. - Answer-100
A secondary winding has __________ turns. - Answer-200
Diode - Answer-A ____ is a device which only allows current to flow through it in one
direction.
Rectifier - Answer-A ______ converts an AC waveform into a DC waveform
What are the two different kinds of rectifier circuits? - Answer-Half-wave and Full-wave
half-wave rectifier - Answer-simplest rectifier, uses one single diode
Half-wave rectification - Answer-When the AC input is positive, the diode is forward-
biased and lets the current through.
When the AC input is negative, the diode is reverse-biased and the diode does not let
any current through, meaning the output is 0V.
, Because there is a 0.7V voltage loss across the diode, the peak output voltage will be
0.7V less than Vs.
Full wave rectification - Answer-When the AC input is positive, diodes A and B are
forward-biased, while diodes C and D are reverse-biased.
When the AC input is negative, the opposite is true...diodes C and D are forward-
biased, while diodes A and B are reverse-biased.
While the full-wave rectifier is an improvement on the half-wave rectifier, its output still
isn't suitable as a power supply for most circuits, since the output voltage still varies
between 0V and Vs-1.4V. So, if you put 24V AC in, you will get 22.6 V DC out.
Resistor - Answer-A ______is an electrical component that limits or regulates the flow of
electrical current in an electronic circuit
Capacitor - Answer-A_______ is a passive electronic component that stores energy in
the form of an electrostatic field
Capacitor (in simpler terms) - Answer-a capacitor consists of two conducting plates
separated by an insulating material called the dielectric.
The standard unit of capacitance is? - Answer-Farad, abbreviated F.
A diode is a specialized electronic component with two electrodes called - Answer-the
anode and the cathode
LED - Answer-The ___ is based on the semiconductor diode
Electroluminescence - Answer-This is an effect called _____ and the color of the light
(corresponding to the energy of the photon) is determined by the energy gap of the
semiconductor.
When a diode is forward biased (switched on), electrons are able to recombine with
holes within the device, releasing energy in the form of photons.
Transitor - Answer-A _______ is a semiconductor device used to amplify and switch
electronic signals.
TRIAC or Triode for Alternating Current - Answer-A _______ is an electronic component
approximately equivalent to two silicon-controlled rectifiers (SCRs/thyristors) joined in
inverse parallel (paralleled but with the polarity reversed) and with their gates connected
together.
OSHA - Answer-The Occupational Safety and Health Act (OSH Act) is the primary
federal law which governs occupational health and safety in the private sector and
federal government in the United States. Its main goal is to ensure employers provide
employees with an environment free from recognized hazards, such as exposure to
