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Preguntas del test (23)
1what is frequency hopping and why is it important?
- A a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a sequence known to both transmitter and receiver.Why is it important: not easy to intercept the transmitted information since the frequency sequence is not known
- Bit is when there are spikes in frequency and it is important because it is easy to intercept the transmitted information
2Why was it important for the USA to allocate radio frequencies for different purposes?
- AAllocation of the frequency spectrum is necessary to prevent radio stations from interfering with one another.
- BIt was necessary because then they would not be able to gage frequency
- AAllocation of the frequency spectrum is necessary to prevent radio stations from interfering with one another.
3 Which molecule will be heavier? Ketamine or Caffeine?
- A Ketamine is heavier
- Bcaffeine is heavier
- A Ketamine is heavier
4Which one of the following options also represents 1,000,000 ohms? 1 mΩ, 1 µΩ, 1 fΩ, 1 pΩ, 1 kΩ, 1 MΩ, 1 GΩ, 1 TΩ
- A1m omega
- B1g omega
5What is the difference between an element and a compound?
- Aa compound is made up of many elements
- Ba compound has no elements
6The unit for charge is?
- ACoulomb
- Bvolt
7 The unit for voltage is?
- AVolt
- Bamper
8The unit for current is?
- Aamper
- Bohm
9The unit for resistance is?
- AOhm
- BWatt
10The unit for power is?
- Awatt
- Bjoule
11The unit for energy is?
- Ajoule
- Bwatt
12Which subatomic particles orbit around the core of an atom?
- Aelectrons
- Bprotons
13Define electrical current?
- ACurrent (I) is the amount of electrons that flows past a point in a unit of time. It is measured in units of ampere (A)
- Bwaves that flow by pushed by electricity
14Which electronic device will you use to check the voltage of battery?
- AMultimeter
- Bgausemeter
- AMultimeter
15What are the 3 basic components of a circuit?
- Avoltage source, a path, a load
- Bpath, load, voltage
16 What is the difference between a fuse and a breaker?
- Awhen a fuse is “blown,” it must be replaced, when a circuit breaker opens, it can be reset and reused repeatedly.
- Bfuses can be opened, reset and reused, circuit breakers are blown
- Awhen a fuse is “blown,” it must be replaced, when a circuit breaker opens, it can be reset and reused repeatedly.
17What is the difference between analog and digital signals?
- AAnalog: a continuous signal, easily lose details by noise can have any voltage, any value
Digital: discrete time signals, not easily affected by noise - BAnalog:discrete time signals, not easily affected by noise
Digital:a continuous signal, easily lose details by noise can have any voltage, any value
- AAnalog: a continuous signal, easily lose details by noise can have any voltage, any value
18What is the difference between a potentiometer and a rheostat
- AVariable resistor to divide voltage: potentiometer
Variable resistor to control current: rheostat - BVariable resistor to divide voltage:rheostat
Variable resistor to control current:
potentiometer
- AVariable resistor to divide voltage: potentiometer
19What is the difference between BJT and MOSFET transistors?
- ABJT is a current-controlled device with three regions and two pn junctions.
Field-effect transistor (FET) is a voltage controlled device where gate voltage controls drain current. - BField-effect transistor (FET)is a current-controlled device with three regions and two pn junctions. is a voltage controlled device where gate voltage controls drain current.
BJT
- ABJT is a current-controlled device with three regions and two pn junctions.
20What is the advantage of parallel circuits over series circuits?
- AOne advantage of a parallel circuit over a series circuit is that when one branch opens, the other branches are not affected.
- BOne advantage of a parallel circuit over a series circuit is that when one branch opens, the other branches are affected
21One advantage of a parallel circuit over a series circuit is that when one branch opens, the other branches are not affected.
- AA low pass filter allows low frequencies to pass through a circuit while attenuating high frequencies. A high pass filter allows high frequencies to pass through a circuit while attenuating low frequencies.
- BA high pass filter allows low frequencies to pass through a circuit while attenuating low frequencies. A high pass filter allows high frequencies to pass through a circuit while attenuating low frequencies.
- AA low pass filter allows low frequencies to pass through a circuit while attenuating high frequencies. A high pass filter allows high frequencies to pass through a circuit while attenuating low frequencies.
22What is a clock oscillator used for in electronic circuits?
- AClock oscillators are used to determine accurate time and frequency source
- BClock oscillators are not used to determine accurate time and frequency source
- AClock oscillators are used to determine accurate time and frequency source
23What is the function of an inverter? List at least two applications for inverters.
- AAn inverter is a power supply that converts AC to DC. Examples of applications for inverters are a battery and solar panels.
- BAn inverter is a power supply that converts BC to EC. Examples of applications for inverters are a battery and solar panels.
Información
- Descripción
- Test sobre HW, creado por Victoria Mata el 11/06/2015.
- Autor
- Victoria Mata
- Idioma
- English
- Visitas
- 0
- Valoración
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