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360+ Mechatronics Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

201.

How many coils are required to make LVDT?

A. 4
B. 6
C. 3
D. 2
Answer» C. 3
202.

A chemical transduction system is interfaced to the optical fibre at its end. This type of sensor is called?

A. chemical sensor
B. thermal sensor
C. photoelectric sensor
D. light sensor
Answer» A. chemical sensor
203.

The register that may be used as an operand register is

A. accumulator
B. b register
C. data register
D. accumulator and b register
Answer» D. accumulator and b register
204.

The register that can be used as a scratch pad is

A. accumulator
B. b register
C. data register
D. accumulator and b register
Answer» B. b register
205.

Which of the processor’s stack does not contain the top-down data structure?

A. 8086
B. 80286
C. 8051
D. 80386
Answer» C. 8051
206.

The architecture of 8051 consists of

A. 4 latches
B. 2 timer registers
C. 4 on-chip i/o ports
D. all of the mentioned
Answer» D. all of the mentioned
207.

The transmit buffer of serial data buffer is a

A. serial-in parallel-out register
B. parallel-in serial-out register
C. serial-in serial-out register
D. parallel-in parallel-out register
Answer» B. parallel-in serial-out register
208.

The receive buffer of serial data buffer is a

A. serial-in parallel-out register
B. parallel-in serial-out register
C. serial-in serial-out register
D. parallel-in parallel-out register
Answer» A. serial-in parallel-out register
209.

The register that provides control and status information about counters is

A. ip
B. tmod
C. tscon
D. pcon
Answer» B. tmod
210.

The register that provides control and status information about serial port is

A. ip
B. ie
C. tscon
D. pcon and scon
Answer» D. pcon and scon
211.

The device that generates the basic timing clock signal for the operation of the circuit using crystal oscillator is

A. timing unit
B. timing and control unit
C. oscillator
D. clock generator
Answer» C. oscillator
212.

The registers that are not accessible by the user are

A. accumulator and b register
B. ip and ie
C. instruction registers
D. tmp1 and tmp2
Answer» D. tmp1 and tmp2
213.

In which of these modes, the immediate operand is included in the instruction itself?

A. register operand mode
B. immediate operand mode
C. register and immediate operand mode
D. none of the mentioned
Answer» B. immediate operand mode
214.

In register address mode, the operand is stored in

A. 8-bit general purpose register
B. 16-bit general purpose register
C. si or di
D. all of the mentioned
Answer» D. all of the mentioned
215.

In which of the following addressing mode, the offset is obtained by adding displacement and contents of one of the base registers?

A. direct mode
B. register mode
C. based mode
D. indexed mode
Answer» C. based mode
216.

In which of the following addressing mode, the offset is obtained by adding displacement, with the contents of SI?

A. direct mode
B. register mode
C. based mode
D. indexed mode
Answer» D. indexed mode
217.

The address of a location of the operand is calculated by adding the contents of any of the base registers, with the contents of any of index registers in

A. based indexed mode with displacement
B. based indexed mode
C. based mode
D. indexed mode
Answer» B. based indexed mode
218.

Which of the following is not a data type of 80286?

A. ordinal or unsigned
B. ascii
C. packed bcd
D. none of the mentioned
Answer» D. none of the mentioned
219.

The representation of 8-bit or 16-bit signed binary operands using 2’s complement is a data type of

A. ordinal
B. ascii
C. packed bcd
D. integer
Answer» D. integer
220.

The instruction that pushes the general purpose registers, pointer and index registers on to the stack is

A. popf
B. push imd
C. push*a
D. pushf
Answer» C. push*a
221.

While executing the PUSH*A instruction, the stack pointer is decremented by

A. 1 bit
B. 2 bits
C. 4 bits
D. 16 bits
Answer» B. 2 bits
222.

The statement that is true for the instruction POP*A is

A. flags are unaffected
B. no operands are required
C. exceptions generated are same as that of push*a
D. all of the mentioned
Answer» D. all of the mentioned
223.

The instruction that multiplies the content of AL with a signed immediate operand is

A. mul
B. smul
C. imul
D. none of the mentioned
Answer» C. imul
224.

The instruction that represents the ‘rotate source, count’ is

A. rcl
B. rcr
C. ror
D. all of the mentioned
Answer» D. all of the mentioned
225.

8051 microcontrollers are manufactured by which of the following companies?

A. atmel
B. philips
C. intel
D. all of the mentioned
Answer» D. all of the mentioned
226.

AT89C2051 has RAM of:

A. 128 bytes
B. 256 bytes
C. 64 bytes
D. 512 bytes
Answer» A. 128 bytes
227.

8051 series has how many 16 bit registers?

A. 2
B. 3
C. 1
D. 0
Answer» A. 2
228.

When 8051 wakes up then 0x00 is loaded to which register?

A. psw
B. sp
C. pc
D. none of the mentioned
Answer» C. pc
229.

When the microcontroller executes some arithmetic operations, then the flag bits of which register are affected?

A. psw
B. sp
C. dptr
D. pc
Answer» A. psw
230.

How are the bits of the register PSW affected if we select Bank2 of 8051?

A. psw.5=0 and psw.4=1
B. psw.2=0 and psw.3=1
C. psw.3=1 and psw.4=1
D. psw.3=0 and psw.4=1
Answer» D. psw.3=0 and psw.4=1
231.

If we push data onto the stack then the stack pointer

A. increases with every push
B. decreases with every push
C. increases & decreases with every push
D. none of the mentioned
Answer» A. increases with every push
232.

How many bytes of bit addressable memory is present in 8051 based microcontrollers?

A. 8 bytes
B. 32 bytes
C. 16 bytes
D. 128 bytes
Answer» C. 16 bytes
233.

Programmable peripheral input-output port is another name for

A. serial input-output port
B. parallel input-output port
C. serial input port
D. parallel output port
Answer» B. parallel input-output port
234.

Port C of 8255 can function independently as

A. input port
B. output port
C. either input or output ports
D. both input and output ports
Answer» C. either input or output ports
235.

All the functions of the ports of 8255 are achieved by programming the bits of an internal register called

A. data bus control
B. read logic control
C. control word register
D. none of the mentioned
Answer» C. control word register
236.

The data bus buffer is controlled by

A. control word register
B. read/write control logic
C. data bus
D. none of the mentioned
Answer» B. read/write control logic
237.

The input provided by the microprocessor to the read/write control logic is

A. reset
B. a1
C. wr(active low)
D. all of the mentioned
Answer» D. all of the mentioned
238.

The device that receives or transmits data upon the execution of input or output instructions by the microprocessor is

A. control word register
B. read/write control logic
C. 3-state bidirectional buffer
D. none of the mentioned
Answer» C. 3-state bidirectional buffer
239.

The port that is used for the generation of handshake lines in mode 1 or mode 2 is

A. port a
B. port b
C. port c lower
D. port c upper
Answer» D. port c upper
240.

If A1=0, A0=1 then the input read cycle is performed from

A. port a to data bus
B. port b to data bus
C. port c to data bus
D. cwr to data bus
Answer» B. port b to data bus
241.

The pin that clears the control word register of 8255 when enabled is

A. clear
B. set
C. reset
D. clk
Answer» C. reset
242.

Which of the following steps detects the key in a 4*4 keyboard matrix about the key that is being pressed?

A. masking of bits
B. ensuring that initially, all keys are open
C. checking that whether the key is actually pressed or not
D. all of the mentioned
Answer» D. all of the mentioned
243.

To detect that in which column, the key is placed?

A. we can mask the bits and then check it
B. we can rotate the bits and then check that particular bit which is set or reset(according to the particular condition)
C. none of the mentioned
D. all of the mentioned
Answer» D. all of the mentioned
244.

In reading the columns of a matrix, if no key is pressed we should get all in binary notation

A. 0
B. 1
C. f
D. 7
Answer» B. 1
245.

If we need to operate a key of a keyboard in an interrupt mode, then it will generate what kind of interrupt?

A. es
B. ex0/ex1
C. t0/t1
D. reset
Answer» B. ex0/ex1
246.

To identify that which key is being pressed, we need to:

A. ground all the pins of the port at a time
B. ground pins of the port one at a time
C. connect all the pins of the port to the main supply at a time
D. none of the mentioned
Answer» B. ground pins of the port one at a time
247.

Key press detection and Key identification are:

A. the same processes
B. two different works are done in keyboard interfacing
C. none of the mentioned
D. any of the mentioned
Answer» B. two different works are done in keyboard interfacing
248.

How many rows and columns are present in a 16*2 alphanumeric LCD?

A. rows=2, columns=32
B. rows=16, columns=2
C. rows=16, columns=16
D. rows=2, columns=16
Answer» D. rows=2, columns=16
249.

Which pin of the LCD is used for adjusting its contrast?

A. pin no 1
B. pin no 2
C. pin no 3
D. pin no 4
Answer» C. pin no 3
250.

For writing commands on an LCD, RS bit is

A. set
B. reset
C. set & reset
D. none of the mentioned
Answer» B. reset

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