# Interfacing with Motors MCQ’s

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This set of Microcontroller Multiple Choice Questions & Answers (MCQs) focuses on “Interfacing with Motors”.

1. Why are ULN2803 normally used between the microcontrollers and the relays?
a) for switching purposes
b) for increasing the current capability required by a relay
c) for increasing the voltage capability required by a relay
d) all of the mentioned

2. Why are opto isolators normally used between the microcontrollers and the ULN2803?
a) to optimize the current
b) to reduce the back emf
c) to increase the current
d) to increase the voltage

3. Why are relays used for driving the motors?
a) they can be used as switch as well as they provide isolation
b) they increase the current capability required by the motors
c) they are used to reduce the back emf from the motors
d) all of the mentioned

4. Which of the following is a type of an electromagnetic relay?
a) SPST
b) SPDT
c) DPDT
d) All of the mentioned

5. Which of the following is an application of stepper motors?
a) in printers
b) in robots
c) in vehicles
d) all of the mentioned

6. What is the meaning of a step angle?
a) angle which a stepper motor has
b) angle between the two windings of the stator in a stepper motor
c) minimum degree of rotation associated with a single step
d) angle between the stator and the rotor

7. Reed switches show connectivity whenever they are in the presence of an electrical field?
a) true
b) false
c) can’t say
d) depends on the conditions

8. What are normal 4 step sequence of a stepper motor if we start to move in clockwise direction with 0110 value?
a) 1100,1001,0011,0110
b) 0011,1001,1100,0110
c) 1001,1100,0110,0011
d) 0101,1010,0101,1010

9. For a normal 4 step sequence, what are the number of teeth required to accomplish a 2 degree step angle?
a) 180
b) 90
c) 360
d) 45

10. Ounch-inch is a unit of a torque.
a) true
b) false
c) can’t say
d) depends on the situation

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