Deck 7: Signaling Systems

Question 1

What is the name of the tone produced by the paging system that repeatedly ascends from low to high?

A) WHOOP
B) HI-LO
C) WAIL
D) HORN

Answer 1

A

Question 2

Describe the power supply to the processor of the Jensen Electric Co. fire alarm system.

Answer 2

The power equipment of the processor is 24 volts dc, which is provided by an uninterruptible power supply. The uninterruptible power supply produces a regulated 24 volts dc from a 120-volt ac 60- hertz supply line. Two 12-volt lead acid storage batteries are contained inside the power supply. If the incoming ac power should fail, the lead acid batteries continue to provide power to the system. This ensures that control power to critical systems is maintained during a power failure.

Question 3

What signaling circuits are present in the industrial building?

Answer 3

A signaling circuit is defined as any electric circuit that energizes signaling equipment. A signaling system may include one or more signaling circuits. For example, in the industrial building, there are several electrical systems that give recognizable visual and audible signals and are classified as signaling systems:
-a master clock;
-a program system;
-a paging or locating system; and
-a fire alarm system.

Question 4

The system is used to provide automatic signals to signal the beginning and ending of shifts, lunch periods, and breaks.

A) master clock
B) program
C) fire alarm
D) atomic clock

Question 5

A sound measured at 95 dB will be .

A) quiet
B) loud
C) very loud
D) uncomfortably loud

Question 6

Quartz clocks are generally accurate to within one second per .

A) day
B) month
C) year
D) decade

Question 7

For a signal or voice to be heard, it should be at least decibels louder than the surrounding noise level at the work station.

A) 5
B) 10
C) 15
D) 20

Question 8

How does the master clock in the industrial building sense time?

Question 9

If the incoming ac power should fail, batteries continue to provide power to the Jensen Electric Co. fire alarm system.

A) lithium
B) lead acid
C) alkaline
D) nickel cadmium

Question 10

The central control unit (CCU) of the fire alarm system manufactured by Jensen Electric Co. is a(n) .

A) mainframe computer
B) amplifier
C) master clock
D) desktop computer

Question 11

A(n) is a clock designed to drive some number of units that display the time.

A) alarm
B) watch program
C) master clock
D) atomic clock

Question 12

The Jensen Electric Co. fire alarm system uses a combination of smoke detectors and .

A) cameras
B) sensor microchips
C) manual pull handles
D) keys

Question 13

A beam atomic clock is used to produce the pulses that are transmitted by the radio station WWV.

A) rubidium
B) cesium
C) francium
D) lithium

Question 14

If a display with a number larger than about 0.55 in. (14 mm) is desired, it will generally use a(n) display.

A) planar gas discharge
B) LED
C) analog
D) fluorescent

Question 15

When selecting a paging system, what five factors should be taken into consideration?

Question 16

When a fire is detected by the Jensen Electric Co. fire alarm system, two alarm devices are activated: the paging system and the .

A) strobe light
B) controller
C) CCU
D) power supply

Question 17

Briefly describe the activation of devices in a Jensen Electric Co. fire alarm system when a fire is detected.

Question 18

The speed of the synchronous motor used to sense time is proportional to its number of poles and the hertz line frequency.

A) 40
B) 50
C) 60
D) 70

Question 19

An LED located on the front cover of the smoke detector, manufactured by Whelan Engineering Co., flashes every seconds to indicate the detector is in working order.

A) four
B) five
C) nine
D) ten

Question 20

In the Jensen Electric Co. fire alarm system, a LED indicates that a fire has been detected.

A) green
B) yellow
C) blue
D) red