Introduction to Mechatronics And Measurement Systems 5Th Edition By David Alciatore – Test Bank

Chapter 10 Actuators

1) Which of the following is an actuator that has a stationary permanent magnet and a coil that moves?
A) voice coil
B) solenoid
C) encoder
D) ac induction motor
E) LVDT

Answer: A

2) For the current (I) and magnetic field (B) directions shown in the figure below, the resulting force on the current-carrying conductor would be in which direction?

A) up
B) down
C) right
D) left

Answer: A

3) For the current (I) and magnetic field (B) directions shown in the figure below, the resulting force on the current-carrying conductor would be in which direction?

A) up
B) down
C) right
D) left

Answer: A

4) A typical ac synchronous motor has
A) a commutator and brushes
B) a slip ring and brushes
C) no brushes
D) a permanent magnet rotor
E) a rotating stator housing

Answer: A

5) What type of dc motor has the same current in both the armature and field windings?
A) series
B) shunt
C) compound
D) permanent magnet
E) stepper

Answer: A

6) What type of dc motor exhibits a linear torque-speed relation?
A) series
B) shunt
C) compound
D) permanent magnet
E) stepper

Answer: D

7) The maximum power output of a permanent magnet dc motor occurs
A) when it is generating maximum torque
B) when it is stalled
C) at its no-load speed
D) at 1/2 of its no-load speed
E) at 1/4 of its no-load speed

Answer: D

8) At a permanent magnet motor’s no-load speed, the motor torque is
A) maximum
B) zero
C) negative
D) so large that the motor comes to a stop
E) very small since the connected load is resisting with a large torque and the shaft is not turning

Answer: B

9) When you increase the supply voltage to a permanent magnet dc motor, the stall torque
A) increases
B) decreases
C) remains the same

Answer: A

10) When you increase the supply voltage to a permanent magnet dc motor, the no-load speed
A) increases
B) decreases
C) remains the same

Answer: A