Poornima Exam 2023

1. Which number system has a base 16?

Hexadecimal
Octal
Binary
Decimal

2.What is a digital-to-analog converter?

It stores digital data on the computer.
It converts alternating current (AC) into direct current (DC).
It converts electrical power into mechanical power.
It takes the digital data from an audio CD and converts it to a useful form.

3. The following hexadecimal number (1E.43)16 is equivalent to

(36.506)8
(36.206)8
(35.506)8
(35.206)8

4.How many entries will be in the truth table of a 4-input NAND gate?

6
8
32
16

5. How many bits are needed to store one BCD digit?

2 bits
4 bits
3 bits
1 bits

6.Convert (312)8 into decimal

(201)10
(202)10
(203)10
(204)10

7.A SCR (Silicon Controlled Rectifier) is a

A SCR (Silicon Controlled Rectifier) is a
Device with 2 junctions
Device with 1 junction
Device with 4 junctions

8. Which semiconductor device is not a current triggering device?

TRIAC
MOSFET
GTO
Thyristor

9.Which of these sets of logic gates are known as universal gates?

XOR, NAND, OR
OR, NOT, XOR
NOR, NAND, XNOR
NOR, NAND

10. What is the addition of the binary number 101001+ 010011=?

010100
111100
000111
101110

11.What is the binary subtraction of 101001 - 010110 =?

010011
100110
011001
010010

Poornima Institute of Engineering and Technology Jaipur

Digital Electronics

Class Test section-C

Warnings