Arduino Questions and Answers – Motor Driver (L293D) and Motors

This set of arduinos MCQs focuses on “Motor Driver (L293D) and Motors”.

1. What is the use of the Motor Driver (L293D) Module?
a) Monitors Motion
b) Evaluates air pressure
c) Controls Motors
d) Switches circuits
View Answer

Answer: d
Explanation: The Motor Driver (L293D) Module is used for controlling motors by one micro-controller or when many motors must be controlled by one micro-controller.

2. How many pins are present in the Motor Driver (L293D) Module?
a) 12
b) 16
c) 13
d) 50
View Answer

Answer: b
Explanation: The L293D Motor Driver Module contains 16 pins which include 4 GND pins, 4 Vcc pins, 4 Output pins, 2 Enabling pins and 2 Voltage pins. All these pins have very specific functions and input patterns which need to be connected in perfect order in order for the module to function properly.

3. What is the use of the EN1_2 pin?
a) Input
b) Output
c) Activation
d) Power input
View Answer

Answer: c
Explanation: The EN1_2 pin is used to enable a part of the IC which controls a segment of the motors connected to it. They accept 5V usually if the module has a 5V rating.
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4. What will happen if we supply a voltage of 250 kV to the Vcc of the L293D module?
a) Damage is caused
b) Module will shut down
c) Module will not respond for the time the voltage is applied
d) Module will function normally
View Answer

Answer: a
Explanation: The L293D modules are mostly built to work on a voltage of approximately 5V. Any voltage lower than that and the module will not be able to power on, but however any voltage significantly above that and the sensor may suffer permanent damage.

5. What is the use of the EN3_4 pin?
a) Input
b) Output
c) Activation
d) Power input
View Answer

Answer: c
Explanation: The EN3_4 pin is used to enable a part of the IC which controls a segment of the motors connected to it. They accept 5V usually if the module has a 5V rating.
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6. What is the use of the OUT1 and OUT2 pins?
a) Input
b) Output
c) Activation
d) Power input
View Answer

Answer: b
Explanation: The OUT1 and OUT2 pins are used to control the motors that are connected to the IC. They accept up to 5V usually if the module has a 5V rating.

7. What is the use of the Vcc2 pin?
a) Input
b) Output
c) Activation
d) Power input
View Answer

Answer: d
Explanation: The Vcc2 pin is used to input a high amount of voltage and is not internally used by the IC. It is there to power the motors attached to it. This way the same IC can be used for controlling higher powered motors.
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8. What is the use of the Vcc1 pin?
a) Input
b) Output
c) Activation
d) Power input
View Answer

Answer: d
Explanation: The Vcc1 pin is used for powering the internal IC components. It accepts a maximum of 5V approximately. This should not be confused with the Vcc2 pin which powers the motors as that could lead to the blowout of the IC.

9. What happens when the sequence 0 1 1 is fed to the IN1, IN2 and EN1_2 pins respectively?
a) Clockwise Motor Rotation
b) Anticlockwise Motor Rotation
c) Stops Motor Rotation
d) Stalls Motor Rotation
View Answer

Answer: b
Explanation: Anticlockwise motor rotation gives the correct logic sequence which enables the micro-controller to turn one set of motors anticlockwise. This is true for the other set too.
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10. What happens when the sequence 1 1 1 is fed to the IN3, IN4 and EN3_4 pins respectively?
a) Clockwise Motor Rotation
b) Anticlockwise Motor Rotation
c) Stops Motor Rotation
d) Stalls Motor Rotation
View Answer

Answer: c
Explanation: Stopping motor rotation altogether gives the correct logic sequence which enables the micro-controller to stop one set of motors. This is true for the other set too.

Sanfoundry Global Education & Learning Series – Arduino.

To practice MCQs on all areas of arduinos, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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