30. When current flows through the coil of a relay, the coil is said to be ____.

ID: 3832132 • Letter: 3

Question

30. When current flows through the coil of a relay, the

coil is said to be ____.

31. A normally closed (NC) relay contact is closed when

current flows through the coil. (True or False)

32. In general, PLC output modules are designed to switch

high current loads directly. (True or False)

33. A(n) ____ operated switch is controlled by hand.

34. Identify the symbols for the input devices shown in above Figure from the

following list: NO pushbutton, NC pushbutton, break-make pushbutton,

selector switch, NC limit switch, NO temperature switch,

NO pressure switch, and NC level switch.

35. Proximity switches usually sense the presence or

absence of a target by means of physical contact. (True or False)

36. A through-beam photoelectric sensor is used to

detect the light beam reflected from a target. (True or False)

37. For a thermocouple to generate a voltage, a

temperature difference must exist between

the (a) ____ and (b) ____ junctions.

31. A normally closed (NC) relay contact is closed when current flows through the coil.

False

32. In general, PLC output modules are designed to switch high current loads directly.

False

33. A(n) __ operated switch is controlled by hand.

manually

35. Proximity switches usually sense the presence or absence of a target by means of physical contact.

True

36. A through-beam photoelectric sensor is used to detect the light beam reflected from a target.

False

37. For a thermocouple to generate a voltage, a temperature difference must exist between the (a) __ and (b) __ junctions.

(a) hot

(b) cold

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