Robotics

Question 1

1A battery labelled 7.4 V, 2,200 mAh stores about how much energy?

Medium

A. 16.3 Wh B. 7.4 Wh C. 2.2 Wh D. 220 Wh

Question 2

2A robot draws 2 A from a 2,000 mAh battery. Approximately how long will it run?

Hard

A. 2 hours B. 4 hours C. 30 minutes D. 1 hour

Question 3

3A PWM signal with a 25% duty cycle on a 12 V supply gives an average voltage of

Hard

A. 3 V B. 12 V C. 6 V D. 9 V

Question 4

4The speed of a DC motor is commonly controlled by

Easy

A. changing its colour B. reversing the battery C. adding sensors D. pulse-width modulation (PWM)

Question 5

5A stepper motor has a step angle of 1.8°. How many steps make one full revolution?

Easy

A. 180 B. 100 C. 200 D. 360

Question 6

6A motor that can be turned to a precise angle, such as 90°, is a

Easy

A. AC fan motor B. DC motor without feedback C. servo motor D. solenoid

Question 7

7Torque is the

Easy

A. speed of a motor B. weight of a robot C. turning force of a motor D. voltage of a battery

Question 8

8An H-bridge circuit is used to

Medium

A. measure distance B. charge a battery C. store a program D. reverse the direction of a DC motor

Question 9

9A circuit used to reverse the direction of a DC motor is an

Easy

A. LDR B. voltage divider only C. H-bridge D. LED driver

Question 10

10The power output of a motor giving 0.5 N m torque at 10 rad/s is

Hard

A. 50 W B. 20 W C. 0.05 W D. 5 W