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S.V. OF ENGINEERING COLLEGE
Karakambadi Road, Tirupati - 517507
II B.Tech I Sem Important Questions (Objective)
Subject: DIGITAL LOGIC DESIGN
Branch: CSE
UNIT-V
1. The storage element for a static RAM is the ________.
A. diode
B. resistor
C. capacitor
D. flip-flop
2. A 64-bit word consists of ________.
A. 4 bytes
B. 8 bytes
C. 10 bytes
D. 12 bytes
3. Select the statement that best describes Read-Only Memory (ROM).
A. nonvolatile, used to store information that changes during system operation
B.
nonvolatile, used to store information that does not change during system
operation
C. volatile, used to store information that changes during system operation
D. volatile, used to store information that does not change during system operation
4. Which of the following best describes random-access memory (RAM)?
A. a type of memory in which access time depends on memory location
B.
a type of memory that can be written to only once but can be read from an
infinite number of times
C. a type of memory in which access time is the same for each memory location
D. mass memory
5. What is a major disadvantage of RAM?
A. Its access speed is too slow.
B. Its matrix size is too big.
C. It is volatile.
D. High power consumption
6. Which type of ROM can be erased by an electrical signal?
A. ROM
B. mask ROM
C. EPROM
D. EEPROM
7. Which of the following is NOT a type of memory?
A. RAM
B. ROM
C. FPROM
D. EEPROM
8. The location of a unit of data in a memory array is called its ________.
A. storage
B. RAM
C. address
D. data
9. Eight bits of digital data are normally referred to as a:
A. group.
B. byte.
C. word.
D. cell.
10. PALs tend to execute ________ logic.
A. SAP
B. SOP
C. PLA
D. SPD
11. The bipolar TTL logic family that was developed to increase switching speed by
preventing transistor saturation is:
A. emitter-coupled logic (ECL).
B. current-mode logic (CML).
C. transistor-transistor logic (TTL).
D. emitter-coupled logic (ECL) and transistor-transistor logic (TTL).
12. Which of the following logic families has the shortest propagation delay?
A. CMOS
B. BiCMOS
C. ECL
D. 74SXX
13. What is the major advantage of ECL logic?
A. very high speed
B. wide range of operating voltage
C. very low cost
D. very high power
14. What is the range of invalid TTL output voltage?
A. 0.0–0.4 V
B. 0.4–2.4 V
C. 2.4–5.0 V
D. 0.0–5.0 V
15. If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each
transistor in the circuit?
A. Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
B. Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
C. Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
D. Q1-OFF, Q2-ON, Q3-OFF, Q4-ON
16. A TTL totem-pole circuit is designed so that the output transistors:
A. are always on together
B. provide linear phase splitting
C. provide voltage regulation
D. are never on together
17. The most common TTL series ICs are:
A. E-MOSFET
B. 7400
C. quad
D. AC00
18. Which family of devices has the characteristic of preventing saturation during
operation?
A. TTL
B. MOS
C. ECL
D. IIL
19. What is the standard TTL noise margin?
A. 5.0 V B.0.0V C.0.8V
D.0.4
20. Which of the following logic families has the highest noise margin?
A. TTL
B.LS TTL
C.CMOS
D.HCMOS
21. The process of entering data into a ROM is called
A. burning in the ROM
B. charging the ROM
C. programming the ROM
D. changing the ROM
22. Which of the following is the fastest logic?
A. ECL
B.ECL
C.CMOS
D.LSI
23. Which of following can not be accessed randomly
A.DRAM
B.SRAM
C.ROM
D.MAGNETIC TAPE
24. The logic 0 level of a CMOS logic device is approximately
A. 1.2 volts
B. 0.4 volts
C. 5 volts
D. 0 volts
25. CMOS circuits are extensively used for ON-chip computers mainly because of their
extremely.
A. low power dissipation.
B. high noise immunity
C. large packing density
D. low cost.