Online Digital Electronics Test - Digital Electronics Test 9

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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In a binary system there are only two symbols.

True

False

[#]

The duty cycle of a square wave is ________.

10%

25%

50%

100%

[#]

Convert hexadecimal value C1 to binary.

11000001

1000111

111000100

111000001

[#]

How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?

any one of the inputs

any two of the inputs

any three of the inputs

all four inputs

[#]

A logic probe is used to test the pins of a 7411 IC with the following results. Is there a problem with the chip and if so, what is the problem?

Pin 6 should be ON.

Pin 6 should be pulsing.

Pin 8 should be ON.

no problem

[#]

With regard to a D latch, ________.

the Q output follows the D input when EN is LOW

the Q output is opposite the D input when EN is LOW

the Q output follows the D input when EN is HIGH

the Q output is HIGH regardless of EN's input state

[#]

Select the response that best describes the use of the Master Reset on typical 4-bit binary counters.

When MR₁ and MR₂ are both HIGH, all Qs will be reset to zero.

When MR₁ and MR₂ are both HIGH, all Qs will be reset to one.

MR₁ and MR₂ are provided to synchronously reset all four flip-flops.

To enable the count mode, MR₁ and MR₂ must be held LOW.

[#]

A bidirectional 4-bit shift register is storing the nibble 1101. Its

input is HIGH. The nibble 1011 is waiting to be entered on the serial data-input line. After three clock pulses, the shift register is storing ________.

1101

0111

0001

1110

[#]

How is a strobe signal used when serially loading a shift register?

to turn the register on and off

to control the number of clocks

to determine which output Qs are used

to determine the FFs that will be used

[#]

10.

What is the difference between a ring shift counter and a Johnson shift counter?

There is no difference.

A ring is faster.

The feedback is reversed.

The Johnson is faster.

[#]

11.

Which of the following is one of the basic characteristics of DRAMs?

DRAMs must have a constantly changing input.

DRAMs must be periodically refreshed in order to be able to retain data.

DRAMs have a broader "dynamic" storage range than other types of memories.

DRAMs are simpler devices than other types of memories.

[#]

12.

A 64-Mbyte SIMM is installed into a system, but when a memory test is executed, the SIMM is detected as a 32-Mbyte device. What is a possible cause?

The memory module was not installed properly.

The voltage on the memory module is incorrect.

The most significant address line is stuck high or low.

The address decoder on the SIMM is faulty.

[#]

13.

What programmable technology is used in FPGA devices?

SRAM

FLASH

Antifuse

All of the above

[#]

14.

The PAL structure is able to perform any sum-of-products (SOP) operation.

True

False

[#]

15.

Of the methods listed, the fastest A/D conversion is done by a ________.

single-slope ramp converter

dual-slope ramp converter

successive-approximation converter

tracking converter

[#]

16.

TTL is alive and well, particularly in ________.

industrial applications

educational applications

military applications

commercial applications

[#]

17.

Which timing diagram shown below is correct for an inverter?

[#]

18.

Determine the voltage on the collector V_c of the given transistor circuit.

0 V

+10 V

+4.7 V

+0.5 V

[#]

19.

How many inputs are required for a 1-of-16 decoder?

[#]

20.

The purpose of a pull-up resistor is to keep a terminal at a ________ level when it would normally be at a ________ level.

LOW, float

HIGH, float

clock, float

pulsed, float

[#]

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Online Digital Electronics Test - Digital Electronics Test 9

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