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CRST > Electronics > Flashcards

Electronics Flashcards

1
Q

you have a 47uH inductor what capacitor is needed to resonate that inductor to 4.5MHz

A

266pf

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2
Q

what is a snubber used for

A

surge suppression

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3
Q

which of the following semiconductors most susceptible to electrical noise and ESD
A) CMOS
B) DTL
C) TTL
D) FET

A

DTL
Digital Transistor Logic

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4
Q

a transformer has a secondary voltage of 120 volts. the primary winding has 1800 turns and the secondary has 90 turns. whats the primary voltage

A

2400 volts

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5
Q

three 0.033microfarad capacitors are connected in series across a 1000HZ signal generator what is the total capacitance as seen by the generator
A) 0.011 micro farad
B) 0.033 micro farad
C) 0.099 micro farad
D) 0.00133 micro farad

A

0.011 microfarad

1/ ((1-C1)+(1/C2)+(1/C3)) or if equal capacitance / number of capacitors

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6
Q

what is a wheatstone bridge used to measure

A

unknown resistance

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7
Q

what is used to boost a digital signal
A) repeater
B) booster
C) amplifier
D) multiplier

A

repeater

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8
Q

current is series circuit ______after passing through each resisitor in the circuit.

A

unchanged

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9
Q

definition of a series circuit

A

only has 1 path for current flow

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10
Q

current state of a decade counter is 1000, after 3 clock pulses the state becomes

A

0001

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11
Q

ripple frequency of full wave rectifier should be

A

120 Hz

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12
Q

input stage to an integrated circuit operational amp is

A

differential amp

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13
Q

impedance of a series LC circuit is

A

minimum at resonance

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14
Q

where would you find a snubber

A

a SCR circuit with an inductive load

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15
Q

how many inputs and outputs are possible with a differential amp
A) two inputs and one output
B) two input and two output
C)
D)

A

2 inputs and 1 output

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16
Q

196
in the figure below which of the following is not true

A

If pins 1 and 4 are low the output is high

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17
Q

203
in figure below assuming pin 4 is pulled low after a pulse occurs on pin 14 then 6 clock pulses on pin 5 what are the outputs of Q-0 thru Q-3 respectfully
A) 11
B)1001
C) 0110
D) 1010

A

0110

18
Q

205
In the figure below with pins 15 and 1 high, 10 and 9 low, pin 11 is pulsed with pin 4 pulled low, how many clock pulses are needed on pin 5 for pin 7 to go high
A) 4
B) 7
C) 5
D) 6

A

5

19
Q

200
figure below is an up/down binary counter after a pulse occurs on pin 14, how many clock pulses need to occur on pin 5 in order for the carry out function on pin 12 to go low. assume pin 4 is pulled low
A) 15
B) 8
C) 7
D) 16

A

15

20
Q

195
what is the function of d-type flip flop in the figure below.

A

Clock divider

21
Q

initial content of a 4 bit bi-directional shift register is 0011. serial input contains 1100 after applying 2 clock pulses when control line is set shift-left mode and then 2 clock pulses when the control line is set to shift-rt mode. the serial output contains.
A) 11
B) 1100
C) 1111
D) 0

A

11

22
Q

true or false serial in-serial out shift register can be used as a time delay device and the number of flip-flops used can alter the amount of the delay

A

true

23
Q

194
in the figure below which of the following is true

A

If either input is high the output will be low

24
Q

what can be used to match high impedance to low impedance

A

transformer, pad emitter follower (or voltage common collector)

25
Q

output of an 8 -bit serial in serial out shift register is connected back to it input. assume the initial content of the shift register is 11000011 after 4 clock pulses, the content becomes
A) 111100
B) 1111
C) 11110000
D) 11000011

A

111100

26
Q

202
Figure below is what time of device
A) 1 0f 8 decoder
B) binary counter
C) octal latch
D) 8 bit shift register

A

1 of 8 decoder

27
Q

199
components in the figure below make up what kind of circuit
A) schmitt trigger
B) two input NOR gate
C) free running oscillator
D) Flip Flop

A

Flip flop

28
Q

177
Figure below is an Octal Bus transceiver. What is its most common application?
A) address decoder
B) data latch
C) two way data communication between data busses
D) comparator

A

two way data communications between busses

29
Q

figure below, pin1 is low, 2 and 3 are high, 4 and 5 are low and 6 is high. What output pin will be low
A) 9
B) 7
C) 10
D) none

A

9

30
Q

primary voltage of a transformer is 480 volts and the secondary is 240 volts. the turn ration of this transformer is_______?

A

2 : 1

31
Q

197
the figure below is an octal latch. Which of the following is true?
A) contents of the latch can only be changed when a clock pulse (CP) occurs
B) the data on the outputs can only be presented when the signal OE is high
C) the contents of the latch cannot be changed if the signal OE is high
D) the data on the output will be the inverse of the data that was input.

A

contents of the latch can only be changed when a clock pulse (CP) occurs

32
Q

198
figure below , what signal or signals determine if transfer is from A to B bus or B to A bus.
A) A-0 thru A-7
B) E
C) B-0 thru B-7
D) DR

A

DR

33
Q

201
device is the figure below
A) serial in serial out shift register
B) parallel shift register
C) serial in parallel out shift register
D) binary counter

A

serial in parallel out shift register

34
Q

204
figure below the intitial contents of Q-0 through Q-7 are 11000011. The input contains a data stream of 10101110. after 4 more clock pulses the output of Q-0 through Q-7 becomes.
A) 11000011
B) 11101100
C) 111010
D) 1010011

A

11101100

35
Q

Disadvantage of Darlington amplifier in a power circuit is
A) relatively high internal current
B) poor transient response
C) low beta
D) poor low freq response

A

relatively high internal current

36
Q

Main disadvantage to an asynchronous counter is_______?
A) propagation delay on the clock pulse as it “ripples through” the flip flop stages
B) propagation delay on the Q output as it passes to the input of the following stages
C) the number of flip flops
D) all answers are correct

A

all answers are correct

37
Q

Which of the following is a characteristic of an SCR?
A) it has a fast turn on when a pulse is delivered to the gate and the anode is positive, with response to the cathode
B) once it starts conducting it can not be shut off by the gate voltage input
C) it conducts only in one direction
D) all answers are correct

A

all answers are correct

38
Q

Two different, pure sine wave frequencies are delivered to a linear amplifier at the same time. An oscilloscope display shows that more that two frequencies are at the output. the problem is
A) anti-resonance
B) RF/ noise gain
C) inter-modulation distortion
D) ringing

A

RF/ Noise gain

39
Q

What is the standard connector type for DMX-512

A

5 pin XLR

40
Q

Advantage of saw-tooth testing over square-wave testing is ?>
A) shows clipping
B) easier to read
C) costs less
D) easier to setup

A

shows clipping

CRST (6 decks)

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