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Wednesday, 5 February 2014

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Important Digital Electronics Logic family objective questions for SAIL and other competitive exams

logic families
Important digital electronics logic families objective questions for competitive exams like SAIL BARC,ONGC,Other PSU’S etc,..

1. Which of the following logic has the fan out of more than 50

a. TTL
b. ECL
c. CMOS
d. MOS

2. The most widely used bipolar technology for digital IC’s is

a. DTL
b. TTL
c. ECL
d. CMOS

3. Which of the following is the fastest logic family

a. DTL
b. TTL
c. ECL
d. None

4. The recommended fan out for TTL is

a. 10
b. 15
c. 20
d. 25

5. Highest fan out is present in

a. CMOS
b. MOS
c. TTL
d. DTL

6. Which of the following has least propagation delay

a. ECL
b. TTL
c. CMOS
d. CTL

7. Which of the following has least power dissipation

a. DTL
b. CTL
c. ECL
d. CMOS

8. The Logic type used in ECL is

a. +ve OR/NOR
b. +ve AND
c. +ve NAND
d. None

9. The Logic type used in CMOS is

a. +ve AND/NAND
b. +ve NOR/NAND
c. +ve OR
d. +ve AND

10. Which of the following has more propagation delay

a. MOS
b. CMOS
c. DTL
d. ECL

11. Which of the following has highest noise immunity

a. ECL
b. TTL
c. CMOS
d. RTL

12. The basic logic gate used in RTL is

a. +ve NAND
b. +ve OR
c. +ve NOR
d. None

13. The basic logic gate used in TTL is

a. +ve NAND
b. +ve OR
c. +ve NOR
d. None

14. Which of the following is very low speed device

a. MOS
b. CMOS
c. TTL
d. ECL

15. Which of the following has low noise margins

a. RTL
b. TTL
c. DTL
d. ECL

16.Which of the following logic families has the highest noise margin?

a. CMOS
b. TTL
c. DTL
d. ECL

17.A "floating" TTL input may be defined as:

a.unused input that is tied to Vcc through a 1 k resistor.>
b.unused input that is tied to used inputs.
c. unused input that is tied to the ground.
d. unused input that is not connected.

18.Which of the logic families listed below allows the highest operating frequency

a. ECL
b. TTL
c. DTL
d. CMOS

19.Generally, the voltage measured at an unused TTL input would typically be measured between

a. 1.4 to 1.8v
b. 0 to 1.8v
c.0 to 2v
d. 0 to 5v

20. Which TTL logic gate is used for wired ANDing

a. Open collector output
b. Tri state output
c.Totem pole
d.ECL gates

6 comments:

  1. Thankyou so much for this test paper. I found some free online GATE test papers where aspirants for GATE can practice for free. Check it out: http://thegateacademy.com/gate-free-test/

    ReplyDelete
  2. really helpfull. you can also provide a chart of comparison.

    ReplyDelete
  3. these questions are also helpful for other competitive exams.

    ReplyDelete
  4. This information most useful to me and also your writing skills too good.. In this post most attraction with nice quotes and videos. Thanks and regards: Sarkari Naukri

    ReplyDelete
  5. This page will update all new updates Best Regards Sarkari Result

    ReplyDelete
  6. Thank u very much to give these information's

    ReplyDelete