Question

1. Stop switches are always in _______ with each other and start switches are always in _______ with each other, both in ladder logic diagrams and in actual hard wiring.

A. series, parallel

B. parallel, parallel

C. parallel, series

D. series, series

2.You notice a pushbutton switch symbol on a ladder diagram that has an arc-shaped line over its vertical line. The arc-shape represents a

A. selector switch.

B. rotary switch.

C. mushroom head.

D. rocker switch.

3.In a typical three-wire motor control circuit derived from a control transformer with a power supply of 120 volts, where does the stop switch get its power?

A. L1

B. L2

C. X1

D. X2

4. If a switch symbol on a relay ladder diagram shows an actuator with a triangular pennant shape, it represents a

A. time-delay relay contact.

B. flow switch.

C. temperature switch.

D. foot switch.

5. To provide a reversible motor-starter control circuit with electrical interlocks that open when the reverse coil is energized, a set of normally closed contacts must be wired in

A. parallel with the reverse coil.

B. parallel with the forward coil.

C. series with the forward coil.

D. series with the reverse coil.