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105 Flashcards

1
Q

Diagram shows a waveform displayed on
the screen of a C.R.O. If the controls on the
C.R.O. are set at 0.5 V/div and 2 ms/div, find
the peak voltage and the frequency of the
input signal.

A

try 5 V, 10 Hz

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2
Q

An RC snubber protects an SCR against

A

False triggering

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3
Q

A multivibrator having two stable states

A

Bistable Multivibrators

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4
Q

Convert the octal number 76108 to
decimal

A

3976

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5
Q

An FET is a _____-controlled device.

A

voltage-driven

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6
Q

Which of the following statements is
Ohm’s Law?

A

I=V/R NOT SURE

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7
Q

An electrical kettle is rated 500W. What
physical quantity does 500W represent?

A

Power

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8
Q

At cut-off region, the collector-base and
base-emitter junctions of a transistor are

A

Reverse, reverse or Both reversed biased

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9
Q

A proximity sensor that operates under the
principle of Faradays Law of Inductance

A

Inductive sensor

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10
Q

Conduction of electrons in a doped
semiconductor happens a

A

Conduction Band

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11
Q

A diac is simply

A

A triac without gate terminal

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12
Q

In Boolean algebra, the expression X.X’ =
0 represents what law?

A

Complement law

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13
Q

A zener diode

A

Has a constant voltage in the breakdown
region

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14
Q

In Boolean algebra, the expression X + 0
= X is an example of what law?

A

Identity law

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15
Q

Determine the inductance at terminals A-B in the network in the figure below. Express your answer in mH

A

15.07 mH

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16
Q

A SCR is usually turned on by

A

A gate trigger

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17
Q

In designing a multiplexer with an 8-bit
SELECT signal (S7, S6, S5, S4, S3, S2, S1,
and S0), determine the maximum number of
input signal that it can accommodate.

A

none of the choices

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18
Q

A BJT is a _____-controlled device.

A

Current

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19
Q

Suppose that DS=E3DAH, SS=DB67H,
BX=23FEH, DX= F8BCH, DI=87CCH,
BP=AAE4H, SI=9FEBH, ER=DC45H, and
FI=C6FH. What will be the content/s of the
destination in the instruction MOV
FI[BP][SI][5FADH], DX?

A

F8BC

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20
Q

For maximum peak-to-peak output
voltage, the Q point should be

A

At the center of the ac load line

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21
Q

Calculate the output offset voltage of
an inverting amplifier using an op-amp with
an input offset current of 10nA. The circuit
has an input resistance of 10 kilo ohms and a
feedback resistance of 100 kilo ohms.

A

1.0 mV

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22
Q

Find the simplified form of the function
((AB)+A C) (BA +AC +AC +BC ) + (BA
+AC ) (AC +BC )

A

AB + AC (VERIFIED)

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23
Q

A SUB instruction stores a value BA67h
at offset value 8DEFh. If the computed
address is 53DBFh, what will be the ending
address? Assume real mode operation.

A

5AFCF

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24
Q

Given the following: Var3=83B7,
EX=9D12 E846H, ESI=497C D18AH,
EDI=4C789 B538H, EBX=8EB3 4B35H.
Suppose that SS = 0013H, an instruction
PUSH [BX+SI+FA] occurs which is located
at 0082 83F5H. From what address/es will
the data be coming from? Assuming
protected mode

A

45FE1767-45FE1768

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25
Q

If 92 C of charge pass through an electric
conductor in 47 seconds, determine the
current (Amperes, A) in the conductor.

A

1.96

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26
Q

If 78 C of charge pass through an electric
conductor in 32 seconds, determine the
current (Amperes, A) in the conductor

A

2.4375 A or 2.44 A

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27
Q

A swamped amplifier uses

A

Negative feedback

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28
Q

What will be the equivalent of
4314245 when converted to Base 11?

A
  • AA86 (None of the choices)
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29
Q

Find the line regulation of a regulator
when full-load voltage is 110 V and no-load
voltage is 120.

A

9.0909

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30
Q

Convert the binary number 111110112 to
Decimal

A

251

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31
Q

A photoelectric device which changes
its internal resistance when light strikes its
surface

A

All of these ( Photoconductive cell, Photoresistor, LDR )

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32
Q

An SCR is a solid state equivalent of

A

Gas-filled triode

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33
Q

A junction diode is said to be forward
biased if

A

A voltage greater than threshold is
applied, with cathode less positive than
anode.

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34
Q

A SUB instruction stores a value
8467h at offset value BD3Fh. If the computed
address is 5B68Eh, what will be the ending
address? Assume real mode operation.

A

5F94E (starting address:4F94F)

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35
Q

In the real mode, what is the ending
address of the segment located by the
segment register value DC84H?

A

DCBA0H not sure

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36
Q

The current in a conductor is 4.5 A. How
many coulombs of charge pass any point in a
time interval of 8.6 min?

A

2322 C

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37
Q

A(n) _____ amplifier is a differential
voltage-gain device that amplifies the
difference between the voltages existing at its
two input terminals.

A

Instrumentation

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38
Q

Calculate the transconductance of a p-channel MOSFET enhancement type if the gate-source voltage Vgs= -8V, threshold
voltage Vt= -4V and a constant k= -0.3mA/V^2.

A

2.4 mS or -2.4mS

39
Q

If Ic is 50mA and Ib is 1mA, then beta
is

A

50

40
Q

An op-amp inverting amplifier uses a
feedback resistor of 100 kilo ohms and input
resistor of 10 kilo ohms. If the op-amp’s input
offset voltage is 2.0mV, approximate the
amplifier output offset voltage due to this
input offset voltage

A

22 mV

41
Q

Code a descriptor that describes a
memory segment that begins at location 003F
BA68H and ends at location 00DA 3FBDH.
The memory segment is a code segment and
can’t be read. The instruction used is a 16-bit
size. It is also assumed that the segment has
been accessed. The privilege level is third to
the lowest. What is the limit?

A

009A8

42
Q

Given the following: Var3=8EB7,
ECX=9D12 EBA6H, ESI=A97C D18AH,
EDI=AC99 B558H, EBX=BE83 48E5H.
Suppose that DS = 0046H, what will be the
address/es accessed by the instruction MOV
EBP, Var3 [ECX][EDI-E6B2H] assuming
protected mode?

A

18029527C-18029527F
16A6F781A-16A6F781B

43
Q

Diagram shows the trace displayed
on the screen of a C.R.O. with the time-base
set to 10 ms/div. What is the frequency, f of
the wave?

A

not 40Hz

44
Q

Simulate the given instructions (below)
and determine which among the choices is
correct. Initially CF=0; AF=0; ZF=0; SF=0; PF=0
MOV AL, D6
MOV BL, E5
ADD AL, BL

A

CF=1; AF=0; ZF=0; SF=1; PF=1

45
Q

In Boolean algebra, the expression X + X
= X represents what law?

A

Idempotent Law

46
Q

Design a combinational circuit with three
inputs (X, Y, & Z) and six outputs. The
output (F, E, D, C, B, A) represents the square
of the designated input. Find the Boolean
expression of the output A in SOP.

A

Z

47
Q

A _____ maintains a constant output
voltage by controlling the duty cycle of a
switch in series with the load.

A

Switching regulator

48
Q

Suppose that CS=3651h, an instruction
JMP [3228 E0C0h] occurs which is located at
36FFFh what will be the new value of CS and
IP, assuming protected mode? Privilege level
is third to the highest.

A

a. CS=0006 IP=2CABA

49
Q

For a class B amplifier, the Q-point is
set at

A

Cutoff

50
Q

Common-base (CB) amplifier has
______ compared to common-emitter (CE)
and common-collector (CC) amplifier.

A

Lower input resistance

51
Q

Suppose that DS=E3DAH, ES=
CF69H, SS=DB67H, AX= 9BCDH,
BX=23FEH, DX= F8BCH, DI=87CCH,
BP=AAE4H, SI=9FEBH, ER=DC45H, and
FI=C6FH. What is the address accessed by
the instruction MOV AH, ER[DI+BX],
assuming real mode?

A

E7E9F

52
Q

Your boss has asked you to recommend a thyristor that will enable you to turn it on with a pulse and also turn it off with a pulse. Which of the following should you recommend?

A

An SCS

53
Q

The minimum value of anode current below which it must fall to completely turn-off the device is called as the

A

holding current value

54
Q

Once a DIAC is conducting, the only way to turn it off is with:

A

low-current dropout

55
Q

When two signed binary numbers in the 2 s complement format were added together, the resulting sum was 10010101,. What signed decimal number does this sum represent?

A

-21 sub 10

56
Q

Given the following: Var3=8EB7, ECX=9D12 EBA6H, ESI=A97C D18AH, EDI=AC99 B558H, EBX=BE83 48ESH. Suppose that DS=0046H, what will be the address/es accessed by the instruction MOV EBP, Var3[ECX][EDI-E6B2H] assuming protected mode?

A

18029527C-18029527F

57
Q

The UIT produce an output pulse when

A

The voltage across B1-£ exceeds the breakover voltage level

57
Q

The UIT produce an output pulse when

A

The voltage across B1-£ exceeds the breakover voltage level

58
Q

To turn an SCR off, simply remove the gate voltage.

A

False

59
Q

Terminals of PUT

A

Anode, Cathode, gate

60
Q

Terminals of PUT

A

Anode, Cathode, gate

60
Q

Terminals of PUT

A

Anode, Cathode, gate

60
Q

Terminals of PUT

A

Anode, Cathode, gate

61
Q

Terminals of PUT

A

Anode, Cathode, gate

62
Q

How many 3-to-8 decoder is needed if you are going to design a 6-to-64 Decoder?

A

9

63
Q

For the SCR to remain in the ON (conducting) state

A

no continuous gate signal is required

64
Q

The TRIAC is equivalent to

A

two SCRs in reverse-parallel

65
Q

The minimum input current that can turn on a thyristor is called the

A

Trigger current

66
Q

Once it is conducting, a Shockley diode can be turned off by.

A

low current dropout?
Large reverse voltage?

67
Q

What is the new value of the CS for an instruction JMP [02DD 3ADCh] which is currently located at addresses 0001 up to 0123?Assume DS=02ADh, privilege level is second to the highest and in protected mode. Refer to the Figure.

A

CS = 02FF no sure

68
Q

Simplify the given Boolean function F together with the don’t care condition d in sum-ofproducts (SOP)

A

AD+A’CD’

69
Q

Convert the decimal number 902610 to Base 17.

A

1E3G sub 17

70
Q

If the circuit is to be designed using D flip-flops, what will be the input equation of the signal in the least significant flip-flop?

A

QaQb’ +X

71
Q

Names called to Shockley diode

A

four-layer diode

72
Q

A solid-state device that has been specifically designed to provide a sharp pulse when its breakover voltage level is reached.

A

UIT

73
Q

What is the expression for Ts.

A

((B⊕C)(C+D))’

74
Q

The can conduct current in either direction and is turned on when a breakover voltage is exceeded.

A

Diac

75
Q

In Boolean algebra, the expression X + 1 = 1 is an example of what law?

A

Null (annulment)

76
Q

The forward break over voltage is the

A

anode-cathode voltage at which conduction starts with no gate signal applied

77
Q

The difference between PUT and UJT is that

A

the peak voltage of the PUT is determined by external components connected to it.

78
Q

When checking a good SCR or TRIAC with an ohmmeter it will:

A

show high resistance in both directions

79
Q

What will be the state of the flip-flops (QAQsQcQp) at time t=15?

A

1110 (simulated)

80
Q

You have a light-dimmer circuit using an SCR. In testing the circuit, you find that Ig = 0 mA and the light is still on. You conclude that the trouble might be one of the following:

A

this is normal; nothing is wrong.

81
Q

You have a need to use a device to trigger an SCR. A good one to use might be

A

a UJT

82
Q

Assuming that the states are identified as the combination ABC, what is the next state for an input of 0 if the current state is 1007?

A

110 (simulated)

83
Q

In Boolean algebra, the expression X.0 = 0 is an example of what law?

A

null

84
Q

In the figure, a low signal was momentarily sent over to the Reset line before fixing the signal to logic 1. What will be the value of SCDQ after the arrival of the 8™ initiating clock?

A

0111

85
Q

In the figure, a low signal was momentarily sent over to the Reset line before fixing the signal to logic 1. What will be the value of SCDQ after the arrival of the 8™ initiating clock?

A

0111

86
Q

Code a descriptor that describes a memory segment that begins at location 003F BA68H and ends at location 00DA 3FBDH. The memory segment is a code segment and can’t be read. The instruction used is a 16-bit size. It is also assumed that the segment has been accessed. The privilege level is third to the lowest. What is byte number 0?

A

A8

87
Q

What logical reason/s can you give why NAND and NOR gates are considered universal gates?

A

they can imitate functions of other gates

88
Q

Use K-map to find the minimum sum-of-products expression for the following functions:
(A,B,C,D,E)=X. (1,3,5,7,8,12,15,18,19,22,23,24,27,28,31).

A

A’B’E+CDE+BD’E’+AB’D+ADE

89
Q

How many non-printable characters are there in the ASCII coding system?

A

nearest answer is 34, 33 talaga

90
Q

Thyristor counterpart of the valley current lV

A

holding current

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