MCQs on Microprocessors and Microcontrollers Part- 6

Microprocessor and Microcontrollers

1. What is the principle on which electromagnetic relays operate?

A) electromagnetic induction

B) motor control

C) Switching

D) none of the mentioned

2. Which of the following is not a type of stepper motor?

A) Variable Reluctance

B) Hybrid

C) Magnetic

D) Lead-Screw

3. 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

4. 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

5. What are DPDT relays?

A) Single pole, single throw

B) Single pole, double throw

C) Double pole, double throw

D) None of the mentioned

6. 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

7. What are optoisolators?

A) it is a driver

B) it is a thing isolated from the entire world

C) it is a device that can be used as an electromagnetic relay without a driver

D) none of the mentioned

8. How can we control the speed of a stepper motor?

A) by controlling its switching rate

B) by controlling its torque

C) by controlling its wave drive 4-step sequence

D) cannot be controlled

9. Which of the following can be a unit for torque?

A) kg/m2

B) ounce-inch

C) kg-m3

D) g/m

10. What is described by the following command? KCODE0<<1

A) load KCODE0 with 0

B) rotate the contents of the KCODE0 register to the right

C) rotate the contents of the KCODE0 register to the left

D) none of the mentioned

11. If the pins of the keyboard are used as an interrupt, then these pins will cause an interrupt of what type?

A) External hardware interrupt

B) Timer interrupt

C) TI/RI interrupt

D) None of the mentioned

12. 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

13. 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

14. Which of the following is not a component of a stepper motor?

A) Windings

B) Rotor and Stator

C) Commutator

D) Brush

E) Both C and D

15. What will happen if the two keys of the keyboard are pressed at a time?

A) both the keys will be displayed on the screen

B) the key which is being actually pressed(for more than 20microseconds) will be displayed

C) the key that is pressed first will be displayed

D) none of the mentioned

16. 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

17. 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

18. What is the difference between full-step and half-step?

A) In full-step two phases are on and in half-step only one phase is on.

B) More resonance is evident in half-step

C) More power required for full-step

D) Half-step offers better resolution

19. Why initially all keys are considered open before detecting the key pressed?

A) to make the task easy

B) to remove the errors caused by other pressing keys during detection

C) to remove the flow problems

D) none of the mentioned

20. Which of the following step/s is/are correct to perform reading operation from an LCD?

A) low to high pulse at E pin

B) R/W pin is set high

C) low to high pulse at E pin & R/W pin is set high

D) none of the mentioned

21. What criteria’s are necessary to consider when selecting a stepper motor?

A) Mechanical Motion.

B) Inertial Load

C) Speed Requirements

D) All of the above

22. Which command of an LCD is used to shift the entire display to the right?

A) 0x1C

B) 0x18

C) 0x05

D) 0x07

23. Which of the following is NOT an advantage of stepper motors?

A) Cost-efficient

B) Maintenance-free

C) No feedback

D) More complex circuitry

24. Which commands are used for addressing the off-chip data and associated codes respectively by data pointer?

A) MOVX & MOVC

B) MOVY & MOVB

C) MOVZ & MOVA

D) MOVC & MOVY

25. Which mode of timer 2 allow to hold the reload values with an assistance of RCAP2H & RCAP2L register pair?

A) 8 bit auto-reload mode

B) 16 bit auto reload mode

C) 8 bit capture mode

D) 16 bit capture mode