semifinal

Question 1

if the frequency of a series RL circuit is increased, the total current will ___

Answer 1

decrease

Question 2

the total opposition to current flow in an RL circuit is expressed in a quantity called _____

Answer 2

impedance

Question 3

if the frequency of a parallel rc circuit is increased, the total currents will _____

Answer 3

increase

Question 4

Which is the most widely used semiconductor material

Answer 4

silicon

Question 5

when voltage is applied to a diode the action occurring in the ____ region either block current flow or passes current

Answer 5

depletion

Question 6

A shorted diode is indicated by low resistance in _____

Answer 6

both direction

Question 7

The primary purpose of a zener diode is to last as a _____ either by itself or in conjunction with other semiconductor devices

Answer 7

voltage regulator

Question 8

A diode will conduct normal current when the _____ is positive with respect to the _____

Answer 8

anode

cathode

Question 9

discs are used almost exclusively as _____ devices

Answer 9

triggering

Question 10

to test as SCR with an ohmmeter connect the _______ led to the anode and the ______ lead to the cathode

Answer 10

positive

negative

Question 11

The fastest way to turn off an SCR is by

Answer 11

zero biasing it

Question 12

The greatest advantage of a photoemissive device is its

Answer 12

speed of operation

Question 13

oscillators

Answer 13

in-phase feedback is called positive feedback

an oscillator is a device that converts dc to ac

an oscillator is an amplifier that supplies its own input signal

Question 14

You are testing an SCR with an OHMMETER. You have connected the positive output lead of the meter to the cathode and the negative lead to the anode. The ohmmeter indicates continuity through the SCR. You should conclude the SCR us _____

Answer 14

shorted

Question 15

The primary function of an octogenarian-coupler is to provide electrical ____ between inputs and outputs, especially in the presence of high voltages

Answer 15

isolation

Question 16

A proprietary supervising station is under ______ and must be located on _____

Answer 16

single ownership

property owned by the owner of the station

Question 17

A ______ switch is a supervisory switch

Answer 17

Room Temperature
Valve tamper
water level

Question 18

A short circuit on a fire alarm initiating device circuit causes a _____ signal

Answer 18

trouble

Question 19

a firestopping material that expands when heated is referred to as

Answer 19

intumescent

Question 20

interconnected fire alarm systems can be connected together by using

Answer 20

electrical contacts listed for the connected load

a lifted gateway

data communications circuits dedicated to the fire alarm system or shared with other building systems

Question 21

in combination systems, fire alarm signals must be

Answer 21

different from other NON-FIRE alarm signals

Question 22

Which sling hitch consists of two or more straight slings of the same type that bring together mulitplelifting points to a single hoisting point?

Answer 22

bridle

Question 23

A _____ is several piece of yarn or wire twisted spirally around an axis

Answer 23

strand

Question 24

_____ limits for rope are established by dividing the breaking strength by the safety factor

Answer 24

safe working load

Question 25

______ describes "tackle" as it relates to rigging and lifting applications

Answer 25

the combination of ropes and accessories arranged with blocks

Question 26

For maximum accuracy, a torque wrench should only be used for ranges between ___ and ___ percent of its maximum rated value

Answer 26

30/80

Question 27

______ force is created by the spring action of a bolt

Answer 27

Clamping

Question 28

The proper use of a torque wrench is

Answer 28

pulling motion toward the operator

Question 29

What is the best way to protect against voltage spikes in a DC circuit.

Answer 29

Add a diode across the play coil

Question 30

non power-limited fire alarm systems have a max operating voltage

Answer 30

600 volts

Question 31

photo-operate devices fall into 3 categories.

Answer 31

photovoltaic photoconductive photoemissive

Question 32

The main difference between an LED and LCD. LEDs ____ light while LCDs ____ light

Answer 32

emit | control

Question 33

The amount of _____ produced by a solar cell is determined by the surface area of the cell

Answer 33

current

Question 34

three advantages of photo operated devices

Answer 34

no moving parts to wear out quick reaction and response time no bouncing contacts

Question 35

5 steps for processes involved in a complete power supply system

Answer 35

``` transformer rectifier filter voltage regulator voltage divider ```

Question 36

3 advantages of fiber optic cable over copper

Answer 36

eliminate electrical and magnetic field interference greater data capacity for longer runs high data security

Question 37

manual fire alarm boxes must be mounted no higher than ____ inches for front reach applications

Answer 37

48

Question 38

a 3-transformer closed cell bank will supply about ____ percent more power to a load than a two transformer open delta bank

Answer 38

25%

Question 39

Four primary functions of fire alarm systems

Answer 39

containment detection suppression notification

Question 40

manual fire alarm boxes must be installed within _____ feet of a doorway

Answer 40

5

Question 41

find the current gain for a transistor with collector current of 60 milliamps and a base current of 0.4 milliamps.

Answer 41

B= Ic/Is