Battery failsafe in Drone Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Battery failsafe trigger output

What will be the output of this drone battery monitoring code snippet when battery level is 15%?

Drone Programming

battery_level = 15
if battery_level < 20:
    print("Warning: Battery low! Initiate failsafe.")
else:
    print("Battery level normal.")

A Error: battery_level undefined

B Battery level normal.

C Warning: Battery low! Initiate failsafe.

D No output

💡 Hint

Check the condition comparing battery_level with 20.

Since battery_level is 15, which is less than 20, the if condition is true and the warning message is printed.

🧠 Conceptual

intermediate

Failsafe activation condition

Which battery level condition correctly activates the failsafe when battery is critically low?

A if battery_level >= 90:

B if battery_level > 10:

C if battery_level == 50:

D if battery_level <= 10:

💡 Hint

Failsafe should trigger at or below a critical low battery percentage.

Failsafe activates when battery is at or below 10%, so condition 'battery_level <= 10' is correct.

🔧 Debug

advanced

Identify the error in battery failsafe code

What error will this code produce when run? battery_level = 25 if battery_level < 20 print("Failsafe activated")

Drone Programming

battery_level = 25
if battery_level < 20
    print("Failsafe activated")

A SyntaxError: expected ':' after if condition

B No error, prints nothing

C IndentationError: unexpected indent

D NameError: battery_level not defined

💡 Hint

Check the syntax of the if statement.

The if statement is missing a colon ':' at the end of the condition line, causing a SyntaxError.

🚀 Application

advanced

Failsafe behavior with multiple battery checks

Given this code, what will be printed if battery_level is 18? battery_level = 18 if battery_level < 10: print("Critical battery! Land immediately.") elif battery_level < 20: print("Warning: Battery low. Prepare to land.") else: print("Battery level sufficient.")

Drone Programming

battery_level = 18
if battery_level < 10:
    print("Critical battery! Land immediately.")
elif battery_level < 20:
    print("Warning: Battery low. Prepare to land.")
else:
    print("Battery level sufficient.")

A Critical battery! Land immediately.

B Warning: Battery low. Prepare to land.

C Battery level sufficient.

D No output

💡 Hint

Check which condition matches battery_level 18 first.

18 is not less than 10, so first if is false. It is less than 20, so elif is true and prints the warning.

❓ Predict Output

expert

Failsafe loop with battery drain simulation

What is the final output of this code simulating battery drain and failsafe activation? battery_level = 25 while battery_level > 0: battery_level -= 7 if battery_level <= 10: print(f"Failsafe activated at {battery_level}% battery") break else: print("Battery drained without failsafe")

Drone Programming

battery_level = 25
while battery_level > 0:
    battery_level -= 7
    if battery_level <= 10:
        print(f"Failsafe activated at {battery_level}% battery")
        break
else:
    print("Battery drained without failsafe")

A Failsafe activated at 4% battery

B Failsafe activated at 11% battery

C Battery drained without failsafe

D Failsafe activated at -3% battery

💡 Hint

Trace battery_level changes each loop iteration.

battery_level decreases by 7 each loop: 25->18->11->4. At 4 (<=10), failsafe triggers and breaks loop.