Signals and Switches

Q1: When an IC has two rows of parallel connecting pins, the device is referred to as a:

A QFP

B DIP

C TSSOP

D CMOS

Q2: A diode placed in parallel across a relay coil serves what function?

A to regulate input voltage

B to protect the coil from arcing

C to ensure most of the current passes through the coil

D to reduce arcing across the relay contacts

Q3: The hexadecimal number 4B16 is transmitted as an 8-bit word in parallel. What is the time required for this transmission if the clock frequency is 2.25 MHz?

A 444 ns

B 444 s

C 3.55 s

D 3.55 ms

Q4: A TTL totem-pole circuit is designed so that the output transistors:

A are always on together

B provide phase splitting

C provide voltage regulation

D are never on together

Q5: An indication of cutoff in an NPN bipolar transistor is that the:

A collector current is maximum

B collector-to-emitter voltage equals zero

C base-to-emitter voltage equals 0.7 V

D collector to emitter appears to be open

Q6: What can a relay provide between the triggering source and the output that semiconductor switching devices cannot?

A total isolation

B faster

C higher current rating

D total isolation and higher current rating

Q7: Which device(s) have almost ideal ON and OFF resistances?

A electromechanical relays

B manual switches

C semiconductor devices (diodes and transistors)

D electromechanical relays and manual switches

Q8: What is used to graphically show the time relationship between two or more digital waveforms?

A reference diagram

B timing diagram

C voltage curve

D load line

Q9: How long will it take to serially transmit the hexadecimal number C316 if the clock frequency is 1.5 MHz?

A 4.69 ms

B 4.69 s

C 5.33 ms

D 5.33 s

Q10:
What is the output voltage Vout for the given circuit if the input voltage changes to 0 V?

A +12 V

B +15 V

C +3 V

D 0 V

Q11: What is the period of a clock waveform that has a frequency of 15.4 kHz?

A 649 s

B 6.49 s

C 64.9 s

D 0.649 s

Q12:
Determine the voltage on the collector Vc of the given transistor circuit.

A 0 V

B +10 V

C +4.7 V

D +0.5 V

Q13: What is a disadvantage of CMOS in place of TTL?

A It switches slower.

B It uses less power.

C It is smaller.

D cost

Q14:
If the input voltage on D1 in the given figure is changed to 0 V, what is the output voltage Vout?

A –5 V

B 0 V

C +5 V

D +4.3 V

Q15: Why does the TTL family use a totem-pole circuit on the output?

A It provides active pull-up.

B It provides active pull-down.

C It provides active pull-up and active pull-down.

Q16:
If the input voltage on the base of the transistor in the given figure is changed to +10 V, what is the new voltage at the collector Vc?

A Not enough information is provided.

B Vc = 10 V

C Vc = 0 V

D Vc = 5 V

Q17: The abbreviation NO, when used with respect to electromechanical relays, stands for not operational.

A True

B False

Q18: The serial format for transmitting binary information uses:

A a single conductor

B multiple conductors

C infrared technology

D fiber-optic

Q19: Internally, a computer's binary data are almost always transmitted on parallel channels, commonly referred to as the:

A parallel bus

B serial bus

C data bus

D memory bus

Q20:
Determine if diodes D1 and D2 in the given figure are forward or reverse biased.

A D1 forward and D2 reverse

B D2 forward and D1 reverse

C D1 and D2 reverse

D D1 and D2 forward

Q21: The family of logic that is composed of bipolar junction transistors is ____.

A TTL

B CMOS

C DIP

D BJT

Q22: What is the advantage of using CMOS logic over TTL?

A It switches faster.

B It uses less power.

C It is larger.

D costNo answer description is available.

Q23: What is the advantage of using serial data transmission over parallel data transmission?

A It is slower.

B Only one pair of wires is required.

C More people use it.

D It is faster.

Q24:
Why is the given circuit called an inverter?

A The output is the opposite (inverse) of the input.

B The output is in phase with the input.

C The output is the same as the input.

D There is no output.

Q25: TTL logic chips must have connections to Vcc and ground, even if all inputs and outputs are properly used and tied to valid signals.

A True

B False

Q26: What is the minimum voltage required before a diode will allow current to flow between the cathode and the anode?

A 0.7 V

B 0.07 V

C 4.3 V

D 0.2 V

Q27: To forward bias a diode, a ________ potential is needed on the ________ and a ________ is needed on the ________.

A negative, cathode, positive, anode

B negative, anode, positive, cathode

Q28:
Is the transistor in the given figure considered ON or OFF?

A OFF

B ON

C Not enough information is provided.

Q29: Why, in most applications, are transistor switches used in place of relays?

A They consume less power.

B They are faster.

C They are quieter and smaller.

D all of the above

Q30:
Determine the output voltage Vout for the circuit in the given figure.

A –0.5 V

B 0 V

C +5 V

D +4.3 V

Q31: With surface-mount technology (SMT), the devices should:

A utilize transistor outline connections

B mount directly

C have parallel connecting pins

D require holes and pads

Q32: Serial communication can be sped up by:

A using silver or gold conductors instead of copper

B using high-speed clock signals

C adjusting the duty cycle of the binary information

Q33: Serial communication can be sped up by:

A using silver or gold conductors instead of copper

B using high-speed clock signals

C adjusting the duty cycle of the binary information

D adjusting the duty cycle of the binary information

Q34: The units for the HIGH time for a periodic wave are ________.

A seconds

B hertz

C cycles

D %

Q35: Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.

A positive, negative

B positive, positive

C negative, positive

D negative, negative

Q36: The period of a waveform is the percentage of time the signal is HIGH.

A True

B False

Q37: In a graphical representation of voltage versus time, ________ is displayed on the ________ axis and ________ is displayed on the ________ axis.

A time, y, voltage, x

B voltage, y, time, x

Q38: Why is parallel data transmission preferred over serial data transmission for most applications?

A It is much slower.

B It is cheaper.

C More people use it.

D It is much faster.

Q39: What is the frequency of a clock waveform if the period of that waveform is
1.25 s?

A 8 kHz

B 0.8 kHz

C 0.8 MHz

D 8 MHz

Q40:
What is the output voltage from the circuit in the given figure?

A +15 V

B +12 V

C +3 V

D 0 V


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