105 Flashcards by Unknown Unknown

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.

try 5 V, 10 Hz

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An RC snubber protects an SCR against

False triggering

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A multivibrator having two stable states

Bistable Multivibrators

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Convert the octal number 76108 to
decimal

3976

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An FET is a _____-controlled device.

voltage-driven

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Which of the following statements is
Ohm’s Law?

I=V/R NOT SURE

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

Power

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

Reverse, reverse or Both reversed biased

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

Inductive sensor

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Conduction of electrons in a doped
semiconductor happens a

Conduction Band

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A diac is simply

A triac without gate terminal

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

Complement law

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A zener diode

Has a constant voltage in the breakdown
region

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

Identity law

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

15.07 mH

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A SCR is usually turned on by

A gate trigger

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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.

none of the choices

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A BJT is a _____-controlled device.

Current

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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?

F8BC

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

At the center of the ac load line

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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.

1.0 mV

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

AB + AC (VERIFIED)

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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.

5AFCF

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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

45FE1767-45FE1768

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

1.96

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

2.4375 A or 2.44 A

A swamped amplifier uses

Negative feedback

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

- AA86 (None of the choices)

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

9.0909

Convert the binary number 111110112 to Decimal

251

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

All of these ( Photoconductive cell, Photoresistor, LDR )

An SCR is a solid state equivalent of

Gas-filled triode

A junction diode is said to be forward biased if

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

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.

5F94E (starting address:4F94F)

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

DCBA0H not sure

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?

2322 C

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

Instrumentation

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.

2.4 mS or -2.4mS

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

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

22 mV

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?

009A8

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?

18029527C-18029527F 16A6F781A-16A6F781B

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?

not 40Hz

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

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

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

Idempotent Law

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

Switching regulator

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. CS=0006 IP=2CABA

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

Cutoff

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

Lower input resistance

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?

E7E9F

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?

An SCS

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

holding current value

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

low-current dropout

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?

-21 sub 10

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?

18029527C-18029527F

The UIT produce an output pulse when

The voltage across B1-£ exceeds the breakover voltage level

The UIT produce an output pulse when

The voltage across B1-£ exceeds the breakover voltage level

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

False

Terminals of PUT

Anode, Cathode, gate

Terminals of PUT

Anode, Cathode, gate

Terminals of PUT

Anode, Cathode, gate

Terminals of PUT

Anode, Cathode, gate

Terminals of PUT

Anode, Cathode, gate

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

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

no continuous gate signal is required

The TRIAC is equivalent to

two SCRs in reverse-parallel

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

Trigger current

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

low current dropout? Large reverse voltage?

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.

CS = 02FF no sure

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

AD+A'CD'

Convert the decimal number 902610 to Base 17.

1E3G sub 17

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?

QaQb’ +X

Names called to Shockley diode

four-layer diode

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

UIT

What is the expression for Ts.

((B⊕C)(C+D))'

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

Diac

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

Null (annulment)

The forward break over voltage is the

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

The difference between PUT and UJT is that

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

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

show high resistance in both directions

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

1110 (simulated)

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:

this is normal; nothing is wrong.

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

a UJT

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?

110 (simulated)

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

null

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?

0111

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?

0111

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?

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

they can imitate functions of other gates

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'B'E+CDE+BD'E'+AB'D+ADE

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

nearest answer is 34, 33 talaga

Thyristor counterpart of the valley current lV

holding current