NC3 U4 Unit Test

Which type of pneumatic motor can reach the highest rotational speed?

• Vane motor

• Piston motor

• Turbine motor

• Ion motor

Stalling a pneumatic motor

• is dangerous.

• causes no damage.

• causes a pressure build-up.

• is impossible.

Which is not an advantage of pneumatic motors?

• Noise reduction compared to electric motors

• Adjustable speed

• Can be stalled without damage

• Lighter than comparable electric motors

What would be the output power of a pneumatic motor rotating at 4000 r/min and producing a torque of 0.2 Nm (1.77 lbf in)?

• 84 W (0.11 hp)

• 747 W (0.99 hp)

• 91 W (0.12 hp)

• 800 W (1.1 hp)

Which of the following methods would allow to reduce the speed of pneumatic motor?

• Add a needle valve at the output.

• Increase the pressure at the input.

• Increase the air volume at the input.

• Add a load to the motor.

All vane motors are reversible.

• True

• False

What causes the actual motor speed to be less than the theoretical speed?

• Friction.

• Internal leakages and compressibility of air.

• Load.

• Pressure losses.

A pneumatic motor generates no torque if

• there is no load.

• the load exceeds the motor output power.

• the motor speed is low.

• pressure exceeds 65% of pressure system.

What would occur if you try to start a bidirectional pneumatic motor with both the primary and secondary exhaust ports blocked?

• The motor will rotate normally.

• The motor will rotate at a ludicrous speed.

• The motor rotate slowly.

• The motor will not start.

Which type of pneumatic motor would be appropriate for a hoist?

• Vane motor

• Piston motor

• Turbine motor

• All of the above