Service Technician Conventional Exam 2024 | latest Questions and Answers
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Course
Ncti
Institution
Ncti
Service Technician Conventional Exam 2024 | latest Questions and Answers
Service Technician Conventional Exam 2024 | latest Questions and Answers
Service Technician Conventional Exam 2024 | latest Questions and Answers
Service Technician Conventional
Exam 2024 | latest Questions and
Answers
What is the value of the current when:
(1) the effective voltage is 120 volts;
(2) the resistance of the source is 3 ohms;
(3) the resistance of the conductors is 2 ohms; and
(4) the resistance of the load is 5 ohms?
- Correct Answer - 12.00 amperes.
What is the power consumed by the load when:
(1) the voltage across the load is 7.5 volts;
(2) the current flowing through the circuit is 0.25 amperes; and
(3) the resistance of the load is 30 ohms?
- Correct Answer - 1.88 watts.
What is the power consumed by coaxial cable loop resistance
when:
(1) the current of the coaxial cable circuit is 5 amperes;
,(2) the loop resistance of the coaxial cable is .9345 ohms; and
(3) the AC power source has an effective voltage of 60 volts?
- Correct Answer - 23.36 watts.
Induction - Correct Answer - Is the production of an
electromotive force (emf) in a conductor by changes in the
magnetic field around the conductor.
A henry is - Correct Answer - Quite a large amount of
inductance, so inductance in AC circuits is usually expressed as a
smaller value; in fractions of one henry.
Inductance is - Correct Answer - The property of an electrical
circuit or conductor that tends to resist changes in the current
flowing through the circuit or conductor.
Inductance in an inductor - Correct Answer - Decreases when
the number of turns around the core are decreased or when there
is an increase in the spacing between the turns around the core.
Inductors - Correct Answer - Are rated in units of henrys.
Mutual inductance is - Correct Answer - The property possessed
by two inductors positioned so that the changing magnetic field
,lines around one of the inductors encircle, or link, the turns of the
other inductor and induce an emf, or voltage, in that inductor.
A transformer - Correct Answer - Is either an air-core or an iron-
core transformer.
When the primary-to-secondary turns ratio in a transformer -
Correct Answer - Is 1:2 or 1/2, the secondary coil voltage is two
times larger than the primary coil voltage.
Air-core transformers - Correct Answer - Get their name from the
material used as the core of the transformer.
The total inductance of an AC circuit - Correct Answer - Is equal
to the sum of all the individual inductances when the circuit's
inductors are connected in series.
The total capacitance of individual capacitors - Correct Answer -
Connected in series is always smaller than the smallest capacitor
value.
The capacitance of a capacitor is - Correct Answer - The ratio of
the electric charge transferred from one plate to the other, to the
potential difference between the plates caused by the applied
voltage.
, What happens when a source of DC voltage is applied to the
plates of a capacitor? - Correct Answer - The plate connected to
the positive terminal of the source receives a positive charge.
Capacitor charging - Correct Answer - Time is directly related to
the size of the circuit resistance and the capacitance of the
capacitor.
Which of the following statements is true? - Correct Answer -
When the capacitor plates have no charges on them, no electric
field exists between the plates.
A farad - Correct Answer - Is a unit of capacitance.
One time constant (t) - Correct Answer - Equals the time
required to charge a capacitor to 63% of its fully charged voltage.
Which of the following generally has the highest fixed capacitance
values? - Correct Answer - Electrolytic capacitors.
Which of the following are referred to as trimmer capacitors? -
Correct Answer - Variable mica capacitors.
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