MCQs on Microprocessor Based Controllers
1 - Question
What is the sequence followed by the automatic washing machine?
a) Washing, soaking, rinsing and drying
b) Soaking, washing, rinsing and drying
c) Washing, soaking, drying and rinsing
d) Drying, soaking, rinsing and washing
Explanation: Soaking, washing, rinsing and drying are the events of the washing machine. According to this, the controller actions are decided. In the other options the sequence is changed and therefore these are not the accurate choices.
2 - Question
The chemical sensor in the washing machine is used ____
a) To count the quantity of detergent
b) To measure the amount of water
c) To measure the pH value of water
d) For Drying operations
Explanation: Chemical sensor is used to measure the pH value of water in the drum and compare to the water supply. The amount of water, pH value and detergent are all sensed by the sensor. Drying operations are performed through another hardware in the device.
3 - Question
The amount of water, pH value and detergent are input to ____
Explanation: The amount of water, pH value and detergent are all sensed by the sensor and sensed qualities are input to the microcontroller. Further the signals are sent from the microcontroller to device so that the user get to know if the work is done. advertisement
4 - Question
What is used to calculate the distance of the object and according to that sets the lens of the camera?
a) Range processor
Explanation: Range sensor is used to calculate the distance of the object and according to that it sets the lens of the camera. The microprocessor sends the signal to the motor for adjusting the lens of the camera.
5 - Question
A CD is made of plastic and a thick layer of aluminium.
Explanation: The CD is made of plastic and a thick layer of aluminium. Between plastic and aluminium layers is a spiral track, 0.5 microns wide with the repetitions of the track 1.6 microns apart radially.
6 - Question
The microprocessor is used in drive motor of CD for controlling the speed.
Explanation: The microprocessor is used to control the speed of the drive motor based on the position of the tracking mechanism. Depending on the complexity of the CD player, sometimes music data is temporarily stored in RAM chip, for anti-skip functions.
7 - Question
What is the precise rate at which the drive motor rotates the CD?
a) 800 to 100 rpm
b) 500 to 200 rpm
c) 1000 to 600 rpm
d) 100 to 200 rpm
Explanation: The drive motor rotates the CD at a precise rate, somewhere between 500 to 200 rpm. The other options are not the accurate or precise rate of rotation and therefore these are not the right choices.
8 - Question
What are the applications of PLC in mechatronics?
a) Timing, counting, logic, arithmetic and sequencing
b) Managing, commanding and directing
c) Storing data
Explanation: Timing, counting, logic, arithmetic and sequencing are the applications of PLC. Managing and commanding are done through the controller, Memory stores the data and Processor is used for processing.
9 - Question
What is the main of DAS (data acquisition system)?
a) Storing data
b) It converts analog to digital data
c) It converts digital to analog data
d) Processes the data
Explanation: DAS is used basically to convert analog to digital quantities, measures several physical quantities and converts them into electrical form. It can measure voltage, current, sound or pressure and various other physical quantities.
10 - Question
Reading mechanism is available in _______
b) Washing machine
c) Digital camera
Explanation: CD consists of a reading mechanism part. A laser and a laser diode read when it can see the laser light. In other options, washing machine, Digital camera and camcorders does not require reading mechanism and they are not available.