Simple Crane Model: MCQs

What is the main purpose of a gear motor in a crane?

• To increase speed

• To increase lifting power for heavy loads

• To store electrical energy

• To reduce power consumption

What does SPDT stand for?

• Single Power Double Turn

• Single Pole Double Throw

• Simple Power Direct Transfer

• Switch Pole Dual Turn

What does an SPDT switch help the crane motor do?

• Change direction of rotation

• Stop automatically

• Increase voltage

• Store energy

What happens when both SPDT switches in an H-Bridge are turned ON at the same time?

• The motor runs faster

• The motor stops safely

• A short circuit may occur

• The direction reverses

Why are gears important in cranes?

What is the power source used in the mini crane project?

• 3V battery

• 7.4V battery

• 9V battery

• USB power

What happens to the crane when the motor polarity is reversed?

• It lifts faster

• The lifting direction changes

• It stops completely

• The battery drains

What role does a pulley play in the crane model?

• It reduces weight

• It increases rotation speed

• It helps lift loads using a thread

• It stores power

Which safety issue can occur if wiring is done incorrectly?

• LED glows brighter

• Motor works faster

• Short circuit and battery damage

• Stronger lifting power

What could make a modern crane smarter and more efficient?

• Adding colorful lights

• Using stronger threads

• Adding sensors and automation for control

• Making it smaller