Which statement is true about universal joints?

Which statement is true about universal joints?

• A. They allow turning at an angle
• B. They are used to measure torque
• C. They sharpen bolts
• D. They replace the drive size adapter

Answer: (A)

Universal joints transmit rotational motion between two shafts that aren’t in a straight line, allowing turning at an angle. This angle flexibility comes from a cross-shaped linkage that pivots in bearings, so power can flow through even when the shafts are misaligned. That’s why this statement is true: you can connect shafts at an angle and still drive torque. They aren’t used to measure torque, sharpen bolts, or replace a drive-size adapter, so the other options describe things U-joints don’t do. (Note: with a single joint, the output speed can vary with angle, which is why engineers sometimes use two joints to smooth the motion.)

Universal joints transmit rotational motion between two shafts that aren’t in a straight line, allowing turning at an angle. This angle flexibility comes from a cross-shaped linkage that pivots in bearings, so power can flow through even when the shafts are misaligned. That’s why this statement is true: you can connect shafts at an angle and still drive torque. They aren’t used to measure torque, sharpen bolts, or replace a drive-size adapter, so the other options describe things U-joints don’t do. (Note: with a single joint, the output speed can vary with angle, which is why engineers sometimes use two joints to smooth the motion.)