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paper of EC embedded, 8051 .

Exam section of megasasta.com

Paper of embedded, 8051 in EC

Course=EC
Subject=embedded, 8051

Question no-1
Unsigned int in embedded c


Optional Answers

(a)                  can store 65600

(b)                  is having size of 16 bit

(c)                  can be use to store negative numbers

(d)                  can store 2.3

Sollution

(b)                  is having size of 16 bit

Question no-2
&& in embedded c is


Optional Answers

(a)                  data type

(b)                  bitwise AND operator

(c)                  Logical AND operator

(d)                  is just a text symbol not operator

Sollution

(c)                  Logical AND operator

Question no-3
Crystal frequency of DS1307 is


Optional Answers

(a)                  32.768Hz

(b)                  32.768KHz

(c)                  32.768Mhz

(d)                  11.0592MHz

Sollution

(b)                  32.768KHz

Question no-4
Slave address uses to read from DS1307 Real time clock is


Optional Answers

(a)                  0xa0

(b)                  0xd0

(c)                  0xc0

(d)                  0xd1

Sollution

(d)                  0xd1

Question no-5
To change baud rate of serial port in 8051 requires


Optional Answers

(a)                  change in value of SBUF

(b)                  change in value of T0

(c)                  change in value of TH1

(d)                  none of the above

Sollution

(c)                  change in value of TH1

Question no-6
In Cs5460 voltage channel can convert the maximum differential voltage


Optional Answers

(a)                  25mV

(b)                  50mV

(c)                  150mV

(d)                  10mV

Sollution

(c)                  150mV

Question no-7
SYNC1 command in CS5460 can be used as


Optional Answers

(a)                  Synchronization of serial port only

(b)                  Initialization of IC only

(c)                  Reset and synchronization of IC

(d)                  Synchronization , re-initialization and NOP of serial port only

Sollution

(d)                  Synchronization , re-initialization and NOP of serial port only

Question no-8
How many 24c02 EPROM can be connected on same I2C bus


Optional Answers

(a)                  1

(b)                  2

(c)                  4

(d)                  8

Sollution

(d)                  8

Question no-9
If variable defined inside two functions with same name


Optional Answers

(a)                  Create error in embedded c program

(b)                  Data will over write in embedded c program

(c)                  It will work without any error as data is local to those functions in embedded c program

(d)                  Will not compile as both global variable names are same

Sollution

(c)                  It will work without any error as data is local to those functions in embedded c program

Question no-10
Variable defined as unsigned int transfers its data into char type variable in embedded c program then


Optional Answers

(a)                  It only transfers lower 8 bits into char type variable

(b)                  Data will not transfer due to different data types of variable

(c)                  Data will be transferred correctly

(d)                  It only transfers higher 8 bits into char type variable

Sollution

(a)                  It only transfers lower 8 bits into char type variable

Jai guru dev

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