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LicenseComputer2. Digital-logic-and-microprocessorMCQsMcqs on Digital Logicset-9

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401. A 32-bit data word consists of

  1. 2 bytes
  2. 4 bytes
  3. 4 nibbles
  4. 3 bytes and 1 nibble
Show me the answer

Answer: 2. 4 bytes

Explanation:

  • A 32-bit data word consists of 32 bits.
  • Since 1 byte = 8 bits, a 32-bit word is equal to:
    328=4 bytes\frac{32}{8} = 4 \text{ bytes}
  • Therefore, the correct answer is 4 bytes.

402. Data are stored in a random-access memory (RAM) during the

  1. Read operation
  2. Write operation
  3. Enable operation
  4. Addressing operation
Show me the answer

Answer: 2. Write operation

Explanation:

  • Data is stored in RAM during the write operation.
  • During the write operation, data is written into the memory location specified by the address.
  • Therefore, the correct answer is Write operation.

403. Data that are stored at a given address in a random-access memory (RAM) is lost when

  1. Power goes off
  2. New data are written at the address
  3. The data are read from the address
  4. Answer (A) and (B)
Show me the answer

Answer: 4. Answer (A) and (B)

Explanation:

  • Data stored in RAM is volatile, meaning it is lost when power goes off.
  • Additionally, if new data is written to the same address, the previous data is overwritten and lost.
  • Therefore, the correct answer is Answer (A) and (B).

404. A ROM is a

  1. Nonvolatile memory
  2. Read/write memory
  3. Volatile memory
  4. Byte-organized memory
Show me the answer

Answer: 1. Nonvolatile memory

Explanation:

  • ROM (Read-Only Memory) is a type of nonvolatile memory, meaning it retains its data even when power is turned off.
  • Therefore, the correct answer is Nonvolatile memory.

405. A memory with 256 addresses has

  1. 256 address lines
  2. A address lines
  3. A address lines
  4. 8 address lines
Show me the answer

Answer: 4. 8 address lines

Explanation:

  • A memory with 256 addresses requires:
    log⁡2256=8 address lines\log_2{256} = 8 \text{ address lines}
  • Therefore, the correct answer is 8 address lines.

406. A byte-organized memory has

  1. 1 data output
  2. 8 data output
  3. 4 data output
  4. 16 data output
Show me the answer

Answer: 2. 8 data output

Explanation:

  • A byte-organized memory has 8 data outputs because a byte consists of 8 bits.
  • Therefore, the correct answer is 8 data output.

407. The storage cell in a SRAM is

  1. A flip-flop
  2. A fuse
  3. A capacitor
  4. A magnetic domain
Show me the answer

Answer: 1. A flip-flop

Explanation:

  • The storage cell in SRAM (Static Random-Access Memory) is typically a flip-flop, which retains data as long as power is supplied.
  • Therefore, the correct answer is A flip-flop.

408. A DRAM must be

  1. Replaced periodically
  2. Always enabled
  3. Refreshed periodically
  4. Programmed before each use
Show me the answer

Answer: 3. Refreshed periodically

Explanation:

  • DRAM (Dynamic Random-Access Memory) uses capacitors to store data, which leak charge over time.
  • Therefore, DRAM must be refreshed periodically to maintain data integrity.
  • The correct answer is Refreshed periodically.

409. A flash memory is

  1. Nonvolatile
  2. A read/write memory
  3. A read-only memory
  4. Answers (A) and (B)
Show me the answer

Answer: 4. Answers (A) and (B)

Explanation:

  • Flash memory is nonvolatile, meaning it retains data without power.
  • It is also a read/write memory, allowing data to be written and read multiple times.
  • Therefore, the correct answer is Answers (A) and (B).

410. Hard disk, floppy disk, Zip disk, and Jaz disk are all

  1. Magneto-optical storage devices
  2. Magnetic storage devices
  3. Semiconductor storage devices
  4. Optical storage devices
Show me the answer

Answer: 2. Magnetic storage devices

Explanation:

  • Hard disks, floppy disks, Zip disks, and Jaz disks all use magnetic storage to store data.
  • Therefore, the correct answer is Magnetic storage devices.

411. Optical storage devices employ

  1. Ultraviolet light
  2. Optical couplers
  3. Electromagnetic field
  4. Lasers
Show me the answer

Answer: 4. Lasers

Explanation:

  • Optical storage devices, such as CDs and DVDs, use lasers to read and write data.
  • Therefore, the correct answer is Lasers.

412. A fixed-function IC package containing four AND gates in an example of

  1. MSI
  2. SOIC
  3. SMT
  4. SSI
Show me the answer

Answer: 4. SSI

Explanation:

  • SSI (Small-Scale Integration) refers to ICs containing a small number of gates, typically fewer than 10.
  • A package with four AND gates is an example of SSI.
  • Therefore, the correct answer is SSI.

413. An LSI device has a circuit complexity of

  1. 12 to 99 equivalent gates
  2. 2000 to 5000 equivalent gates
  3. 100 to 9999 equivalent gates
  4. 10,000 to 99,999 equivalent gates
Show me the answer

Answer: 4. 10,000 to 99,999 equivalent gates

Explanation:

  • LSI (Large-Scale Integration) refers to ICs with a complexity of 10,000 to 99,999 equivalent gates.
  • Therefore, the correct answer is 10,000 to 99,999 equivalent gates.

414. A positive-going pulse is applied to an inverter. The time interval from the leading edge of the input to the leading edge of the output is 7 ns. This parameter is

  1. Speed-power product
  2. Propagation delay t(PLH)t(_{PLH})
  3. Propagation delay, t(PLH)t(_{PLH})
  4. Pulse width
Show me the answer

Answer: 3. Propagation delay, t(PLH)t(_{PLH})

Explanation:

  • The time interval from the leading edge of the input to the leading edge of the output is known as propagation delay (t(PLH))(t(_{PLH})).
  • Therefore, the correct answer is Propagation delay, (t(PLH))(t(_{PLH})).

415. The CMOS family with the fastest switching speed is

  1. AC
  2. ACT
  3. HC
  4. ALVC
Show me the answer

Answer: 4. ALVC

Explanation:

  • The ALVC (Advanced Low-Voltage CMOS) family is known for its fastest switching speed among CMOS families.
  • Therefore, the correct answer is ALVC.

416. If power were the major criterion in the design of a digital system, the logic family that you would probably use is

  1. HCL
  2. LV
  3. ALVC
  4. LVC
Show me the answer

Answer: 4. LVC

Explanation:

  • LVC (Low-Voltage CMOS) is designed for low power consumption, making it suitable for power-sensitive designs.
  • Therefore, the correct answer is LVC.

417. When the frequency of the input signal to a CMOS gate is increased, the average power dissipation

  1. Decreases
  2. Does not change
  3. Increases
  4. Decreases exponentially
Show me the answer

Answer: 3. Increases

Explanation:

  • In CMOS gates, power dissipation increases with the frequency of the input signal due to increased switching activity.
  • Therefore, the correct answer is Increases.

418. CMOS operates more reliably than TTL in a high-noise environment because of its

  1. Lower noise margin
  2. Higher noise margin
  3. Input capacitance
  4. Smaller power dissipation
Show me the answer

Answer: 2. Higher noise margin

Explanation:

  • CMOS has a higher noise margin compared to TTL, making it more reliable in high-noise environments.
  • Therefore, the correct answer is Higher noise margin.

419. Proper handling of a CMOS device is necessary because of its

  1. Fragile construction
  2. High-noise immunity
  3. Susceptibility to electrostatic discharge
  4. Low power dissipation
Show me the answer

Answer: 3. Susceptibility to electrostatic discharge

Explanation:

  • CMOS devices are highly sensitive to electrostatic discharge (ESD), which can damage the device.
  • Therefore, the correct answer is Susceptibility to electrostatic discharge.

420. Which of the following is not a TTL circuit?

  1. 74F00
  2. 74HC00
  3. 74AS00
  4. 74ALS00
Show me the answer

Answer: 2. 74HC00

Explanation:

  • The 74HC00 is a CMOS device, not a TTL (Transistor-Transistor Logic) circuit.
  • Therefore, the correct answer is 74HC00.

421. An open TTL NOR gate input

  1. Acts as a LOW
  2. Should be grounded
  3. Acts as a HIGH
  4. Answers (B) and (C)
Show me the answer

Answer: 4. Answers (B) and (C)

Explanation:

  • An open TTL NOR gate input acts as a HIGH because TTL inputs float high when left unconnected.
  • It is also recommended to ground unused inputs to avoid noise.
  • Therefore, the correct answer is Answers (B) and (C).

422. An LS TTL gate can drive a maximum of

  1. 20 unit loads
  2. 40 unit loads
  3. 10 unit loads
  4. Unlimited unit loads
Show me the answer

Answer: 1. 20 unit loads

Explanation:

  • An LS TTL gate can drive a maximum of 20 unit loads.
  • Therefore, the correct answer is 20 unit loads.

423. If two unused inputs of a LS TTL gate are connected to an input being driven by another LS TTL gate, the total number of remaining unit loads that can be driven by this gate is

  1. Seven
  2. Seventeen
  3. Eight
  4. Unlimited
Show me the answer

Answer: 2. Seventeen

Explanation:

  • Each unused input of an LS TTL gate counts as 1 unit load.
  • If two unused inputs are connected, they consume 2 unit loads, leaving 17 unit loads remaining.
  • Therefore, the correct answer is Seventeen.

424. The main advantage of ECL over TTL or CMOS is

  1. ECL is less expensive
  2. ECL consumes less power
  3. ECL is available in a greater variety of circuit type
  4. ECL is faster
Show me the answer

Answer: 4. ECL is faster

Explanation:

  • The main advantage of ECL (Emitter-Coupled Logic) over TTL or CMOS is its high speed.
  • Therefore, the correct answer is ECL is faster.

425. ECL cannot be used in

  1. High-noise environments
  2. High-frequency applications
  3. Damp environments
  4. ECL is less expensive
Show me the answer

Answer: 1. High-noise environments

Explanation:

  • ECL is not suitable for high-noise environments due to its low noise immunity.
  • Therefore, the correct answer is High-noise environments.

426. The basic mechanism for storing a data bit in an E(2)E(^2)CMOS cell is

  1. Control gate
  2. Floating gate
  3. Floating drain
  4. Cell current
Show me the answer

Answer: 2. Floating gate

Explanation:

  • In E(^2)CMOS (Electrically Erasable CMOS), data is stored using a floating gate.
  • Therefore, the correct answer is Floating gate.

427. A CPLD is a

  1. CMOS programmable logic device
  2. Capacitive programmable logic device
  3. Complex programmable logic device
  4. Complementary process latching device
Show me the answer

Answer: 3. Complex programmable logic device

Explanation:

  • A CPLD (Complex Programmable Logic Device) is a type of programmable logic device with a higher complexity than simpler PLDs.
  • Therefore, the correct answer is Complex programmable logic device.

428. VHDL is a

  1. Logic device
  2. Computer language
  3. PLD programming language
  4. Very high density logic
Show me the answer

Answer: 3. PLD programming language

Explanation:

  • VHDL (VHSIC Hardware Description Language) is a PLD programming language used for designing and simulating digital circuits.
  • Therefore, the correct answer is PLD programming language.

429. The types of SPLDs do not include

  1. GAL
  2. RAM
  3. PROM
  4. PAL
Show me the answer

Answer: 2. RAM

Explanation:

  • SPLDs (Simple Programmable Logic Devices) include GAL, PROM, and PAL, but RAM is not an SPLD.
  • Therefore, the correct answer is RAM.

430. A GAL has

  1. A reprogrammable AND array, a fixed OR array, and programmable output logic
  2. A fixed AND array and a programmable OR array
  3. One-time programmable AND and OR array
  4. Reprogrammable AND and OR array
Show me the answer

Answer: 1. A reprogrammable AND array, a fixed OR array, and programmable output logic

Explanation:

  • A GAL (Generic Array Logic) has a reprogrammable AND array, a fixed OR array, and programmable output logic.
  • Therefore, the correct answer is A reprogrammable AND array, a fixed OR array, and programmable output logic.

431. An SPLD that has a programmable AND array and a fixed OR array is a

  1. PROM
  2. PAL
  3. PLA
  4. GAL
Show me the answer

Answer: 2. PAL

Explanation:

  • A PAL (Programmable Array Logic) has a programmable AND array and a fixed OR array.
  • Therefore, the correct answer is PAL.

432. A connection between a row and column in a PAL array is made by

  1. Blowing a fusible link
  2. Leaving a fusible link intact
  3. Connecting an input variable to the input line
  4. Connecting an input variable to the product tem line
Show me the answer

Answer: 2. Leaving a fusible link intact

Explanation:

  • In a PAL array, connections are made by leaving a fusible link intact.
  • Therefore, the correct answer is Leaving a fusible link intact.

433. The device number PAL14H4 indicates

  1. A PAL with fourteen active-HIGH outputs and four inputs
  2. A PAL that implements fourteen AND gates and four OR gates
  3. A PAL with implements and four active-HIGH outputs
  4. Who the manufacturer is
Show me the answer

Answer: 3. A PAL with implements and four active-HIGH outputs

Explanation:

  • The device number PAL14H4 indicates a PAL with four active-HIGH outputs.
  • Therefore, the correct answer is A PAL with implements and four active-HIGH outputs.

434. A GAL is different from a PAL because

  1. A GAL has more inputs and outputs
  2. A GAL is implemented with a different technology
  3. A GAL can replace several different PALs
  4. All except answer 1
Show me the answer

Answer: 4. All except answer 1

Explanation:

  • A GAL (Generic Array Logic) is different from a PAL because it uses different technology, can replace several PALs, and has programmable output logic.
  • Therefore, the correct answer is All except answer 1.

435. The reprogrammable cells in a GAL array are

  1. TTL
  2. ECL
  3. E2^2CMOS
  4. Bipolar fuses
Show me the answer

Answer: 3. E(^2)CMOS

Explanation:

  • The reprogrammable cells in a GAL array are made using E(^2)CMOS technology.
  • Therefore, the correct answer is E(^2)CMOS.

436. OLMC is an acronym for

  1. Output Logic Main Cell
  2. Output Logic Macrocell
  3. Optimum Logic Multiple Channel
  4. Odd-parity Logic Master Check
Show me the answer

Answer: 2. Output Logic Macrocell

Explanation:

  • OLMC stands for Output Logic Macrocell, which is a key feature in GAL devices.
  • Therefore, the correct answer is Output Logic Macrocell.

437. Two ways in which a GAL output can be configured are

  1. Combinational and I/O
  2. Fixed and variable
  3. Simple and complex
  4. Combinational and registered
Show me the answer

Answer: 4. Combinational and registered

Explanation:

  • A GAL output can be configured as either combinational or registered.
  • Therefore, the correct answer is Combinational and registered.

438. The device number GAL22V10 means that

  1. The device has22 dedicated inputs and 10 dedicated outputs
  2. The device has 22 inputs including dedicated inputs and I/Os and 10 outputs either dedicated or I/Os
  3. The device has a variable number of inputs form a maximum of 22 to a minimum of 10
  4. The device has 24 inputs including dedicated inputs and I/Os and 14 outputs either dedicated or I/Os
Show me the answer

Answer: 2. The device has 22 inputs including dedicated inputs and I/Os and 10 outputs either dedicated or I/Os

Explanation:

  • The device number GAL22V10 indicates that the device has 22 inputs (including dedicated inputs and I/Os) and 10 outputs (either dedicated or I/Os).
  • Therefore, the correct answer is The device has 22 inputs including dedicated inputs and I/Os and 10 outputs either dedicated or I/Os.

439. To conventionally program an SPLD, you need a

  1. Special fixture
  2. Special fixture and a master PLD that has been preprogrammed at the factory
  3. Computer, a programmer, and HDL software
  4. Computer, a programmer, and BASIC software
Show me the answer

Answer: 3. Computer, a programmer, and HDL software

Explanation:

  • To conventionally program an SPLD, you need a computer, a programmer, and HDL software.
  • Therefore, the correct answer is Computer, a programmer, and HDL software.

440. ISP stands for

  1. In-System Programmable
  2. Integrated Silicon Program
  3. Integrated System Program
  4. In-System Integrated Programming
Show me the answer

Answer: 1. In-System Programmable

Explanation:

  • ISP stands for In-System Programmable, which allows devices to be programmed while installed in the system.
  • Therefore, the correct answer is In-System Programmable.

441. The GAL22V10 has

  1. 10 inputs and 22outputs
  2. 22 dedicated inputs and 10 outputs
  3. 12 dedicated inputs and 10 dedicated outputs
  4. 12 dedicated inputs and 10 outputs, any of which can be an input
Show me the answer

Answer: 4. 12 dedicated inputs and 10 outputs, any of which can be an input

Explanation:

  • The GAL22V10 has 12 dedicated inputs and 10 outputs, any of which can also function as inputs.
  • Therefore, the correct answer is 12 dedicated inputs and 10 outputs, any of which can be an input.

442. The GAL22V10 operates on a dc supply voltage of

  1. 5V
  2. 3.3V
  3. 10V
  4. 1.2V
Show me the answer

Answer: 2. 3.3V

Explanation:

  • The GAL22V10 operates on a 3.3V DC supply voltage.
  • Therefore, the correct answer is 3.3V.

443. OLMC stand for

  1. Output logic modular circuit
  2. Output latch memory cell
  3. Output logic macrocell
  4. Overall logic matrix circuit
Show me the answer

Answer: 3. Output logic macrocell

Explanation:

  • OLMC stands for Output Logic Macrocell, which is a key feature in GAL devices.
  • Therefore, the correct answer is Output logic macrocell.

444. The three states of a tri-state output buffer are

  1. HIGH, LOW, high impedance
  2. HIGH, LOW, in between
  3. HIGH, LOW, ground
  4. Right, left, centre
Show me the answer

Answer: 1. HIGH, LOW, high impedance

Explanation:

  • A tri-state output buffer can be in one of three states: HIGH, LOW, or high impedance.
  • Therefore, the correct answer is HIGH, LOW, high impedance.

445. The OLMC of the GAL22V10 contains

  1. One OR gate, one flip-flop, two multiplexers
  2. One OR gate, one flip-flop, one multiplexer
  3. One AND gate, one latch, two multiplexers
  4. One OR gate, one flip-flop, two decoders
Show me the answer

Answer: 1. One OR gate, one flip-flop, two multiplexers

Explanation:

  • The OLMC (Output Logic Macrocell) of the GAL22V10 contains one OR gate, one flip-flop, and two multiplexers.
  • Therefore, the correct answer is One OR gate, one flip-flop, two multiplexers.

446. The GAL16V8 has

  1. 16 dedicated inputs and 8 outputs
  2. 8 dedicated inputs and 8 inputs /outputs
  3. 8 inputs and 16 outputs
  4. 16 input/outputs and 8 outputs
Show me the answer

Answer: 2. 8 dedicated inputs and 8 inputs /outputs

Explanation:

  • The GAL16V8 has 8 dedicated inputs and 8 inputs/outputs.
  • Therefore, the correct answer is 8 dedicated inputs and 8 inputs /outputs.

447. A typical OLMC consists of

  1. Gates, multiplexers, and a flip-flop
  2. Gates, and a shift register
  3. A Gray code counter
  4. A fixed logic array
Show me the answer

Answer: 1. Gates, multiplexers, and a flip-flop

Explanation:

  • A typical OLMC (Output Logic Macrocell) consists of gates, multiplexers, and a flip-flop.
  • Therefore, the correct answer is Gates, multiplexers, and a flip-flop.

448. A CPLD is a

  1. CMOS PLD
  2. Complementary PLD
  3. Complex PLD
  4. A fixed logic array
Show me the answer

Answer: 3. Complex PLD

Explanation:

  • A CPLD (Complex Programmable Logic Device) is a type of Complex PLD.
  • Therefore, the correct answer is Complex PLD.

449. A CPLD contains

  1. Shift registers
  2. Logic arrays
  3. Programmable interconnections
  4. Answers (B) and (C)
Show me the answer

Answer: 4. Answers (B) and (C)

Explanation:

  • A CPLD contains logic arrays and programmable interconnections.
  • Therefore, the correct answer is Answers (B) and (C).

450. FPGA stands for

  1. Fast propagation gate array
  2. Field programmable gate array
  3. Field presentable gate application
  4. File programmable gate array
Show me the answer

Answer: 2. Field programmable gate array

Explanation:

  • FPGA stands for Field Programmable Gate Array, which is a type of programmable logic device.
  • Therefore, the correct answer is Field programmable gate array.
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