Review 2nd quarter

Cooling towers must be thoroughly cleaned on a regular basis to minimize ___.

bacteria growth ANS: A PTS: 1 REF: Obj 414.2 Reading Assignment

___ affect the time required for a motor to come to a stop.

both The inertia of the motor and its load and Friction EMC 5e-Sec 17-1

The performance of preventive maintenance can ___.

all of these: reduce safety hazards reduce operating costs increase efficiency ANS: D PTS: 1 REF: EMC 5e-Sec 29-1

Programmable controllers ___ capable of controlling the hydraulic pressure in robotic operations.

are ANS: AEMC 5e-Sec 27-3

Shielded cable should be grounded at ___ of the cable.

only one end ANS: A PTS: 1 REF: EMC 5e-Sec 27-2

___ braking of a motor involves the application of a DC voltage to the windings of an AC motor after AC

Electric EMC 5e-Sec 17-3

An HMI is a ___.

Human Machine Interface ANS: D PTS: 1 REF: EMC 5e-Sec 27-1

After determining that power is present on the line side of the fuses in a safety switch in the ON position, the fuses can be checked with a voltmeter by placing the meter leads between ___.

the line side of one fuse and the load side of the other fuse(s) ANS: B PTS: 1 REF: EMC 5e-Sec 3-2

Refer to Figure 416-12. The fewest number of NO sets of contacts (excluding OL contacts) required for starterM1 is ___

3 ANS: A PTS: 1 REF: EMC 5e-Sec 5-5

Troubleshooting control circuits requires the use of ___.

all of these electrical test equipment drawings and diagrams manufacturer specifications ANS: D PTS: 1 REF: EMC 5e-Sec 5-5

Generally, programmable controllers are designed to ___ when the CPU fault lamp is energized

both de-energize all outputs and display an error message ANS: C PTS: 1 REF: EMC 5e-Sec 27-2

When NAND logic is utilized in a control circuit, the output (load) is de-energized when ___.

both inputs A and B are activated ANS: D PTS: 1 REF: EMC 5e-Sec 27-2

When OR logic is utilized in a control circuit, the output (load) is energized when ___.

both inputs A and B are activated III. either input A or B is activated ANS: E PTS: 1 REF: EMC 5e-Sec 27-2

For a variable torque/variable horsepower (VT/VH) load, an increase in operating speed requires an increase in___.

both torque and horsepower EMC 5e-Sec 18-3

An AC drive contains a(n) ___.

converter EMC 5e-Sec 26-4

To reduce electrical noise, sensitive analog and digital input devices are connected to a programmable controller with ___ cable.

shielded ANS: A PTS: 1 REF: EMC 5e-Sec 27-2

When wye-delta starting is used, the voltage across each motor winding in the wye configuration is approximately ___ % of the line-to-line voltage.

58 EMC 5e-Sec 19-7

A motor that is to be started in wye and run in delta must have at least ___ leads.

6 EMC 5e-Sec 19-7

Fire pumps are generally started using ___.

an FVNR starter Obj 410.3 Reading Assignment

If a motor is started at reduced voltage, the motor is ___ disconnected from the voltage source when open circuit transition is used.

momentarily EMC 5e-Sec 18-5

When NOR logic is utilized in a control circuit, the output (load) is energized when ___.

neither input A nor B is activated ANS: B PTS: 1 REF: EMC 5e-Sec 27-2

PLCs ___ be programmed and reprogrammed

can ANS: A PTS: 1 REF: EMC 5e-Sec 27-1

NOR logic utilizes ___ switch contacts for connection to programmable controller input terminals.

normally-closed ANS: A PTS: 1 REF: EMC 5e-Sec 27-2

When the suppression system is activated, supply fans are turned ___.

off ANS: A PTS: 1 REF: Obj 415.1 Reading Assignment

When using a programmable controller to control a conveyor system, the memory contacts for START PB switches are ___.

programmed ANS: BEMC 5e-Sec 27-3

Control circuit methods used to reduce the starting current of a motor are called ___ starting circuits.

reduced-voltage EMC 5e-Sec 19-1_INTRO

Primary-resistor starting works by ___.

connecting a resistor in series with each motor circuit conductor EMC 5e-Sec 19-6

Refer to Figure 415-48. The Ansul is "armed." However, since cooking operations have not started, CLFS is inthe OFF position. Someone has noticed a fire and "fires" the Ansul. The siren is now ___.

sounding alarm ANS: A REF: Obj 415.1 Reading Assignment OBJ: Obj 415.1 Worksheet

For a constant torque/variable horsepower (CT/VH) load, an increase in operating speed requires a(n) ___ inhorsepower.

increase EMC 5e-Sec 18-3

The main function of capacitors in the DC bus of an AC motor drive is to ___.

maintain proper voltage levels when voltage fluctuates EMC 5e-Sec 26-4

To predict possible equipment or system failures, ___ is utilized as a part of predictive maintenance.

vibration analysis thermography visual and auditory inspection ultrasonic analysis electrical analysis ANS: F PTS: 1 REF: EMC 5e-Sec 30-1

There is (are) ___ exhaust hood(s) shown Figure 415-48.

two ANS: A PTS: 1 REF: Obj 415.1 Reading Assignment

An AC drive controls the torque of an AC motor by varying the ___ applied to the motor.

voltage EMC 5e-Sec 26-4

Proper O&M (Operation and Maintenance) of a building management system ___.

All of these: can save 5% to 20% on energy bills mitigates potential hazards caused by deferred maintenance ensures that the design life expectancy of equipment is achieved reduces the risks associated with dangerous indoor air quality situations ANS: E PTS: 1 REF: Obj 414.2 Reading Assignment

___ can be connected to the input terminals of a programmable controller

Any of these: A foot switch,. A push button switch, The NC contacts of a timing relay Obj 412.1 Reading Assignment

Which of the following are characteristics of solar cells?

Both I.They have a 20- to 25-year life span. AND III. They have a low duty cycle and produce peak power at noon each day ANS: E PTS: 1 REF: Obj 414.1 Reading Assignment

A chiller is a part of a building cooling system and is used to directly cool ___.

water ANS: A PTS: 1 REF: Obj 414.2 Reading Assignment

Typically, wind turbines and solar cells are complementary because ___.

when one is producing peak power the other is producing minimal power ANS: A PTS: 1 REF: Obj 414.1 Reading Assignment

Most motors will operate satisfactorily within ___ % (+ or -) of the rated voltage.

10 ANS: D PTS: 1 REF: Obj 416.2 Reading Assignment

In the United States, about ___% of the electric energy used is for lighting purposes.

20 ANS: C PTS: 1 REF: Obj 414.1 Reading Assignment

___ add resistance to airflow and build pressure in HVAC systems.

Dampers ANS: D PTS: 1 REF: Obj 414.2 Reading Assignment

Which is true for part-winding starting?

It is less expensive than most other starting methods but has low starting torque

___ is a method used to ensure that redundant equipment ages uniformly.

Lead-lag ANS: A PTS: 1 REF: Obj 414.2 Reading Assignment

SCRs are used in solid-state starters. SCRs ___.

all of these: have no contacts, are small in size, are rugged EMC 5e-Sec 25-4

Motor drives provide energy savings when used with ___ and loads.

both variable-speed and variable-torque EMC 5e-Sec 26-EEP

Where used in a control circuit, relay coils are connected to the ___ terminals on a programmable controller

output ANS: B PTS: 1 REF: EMC 5e-Sec 27-2

Where used in a control circuit, starter coils are connected to the ___ terminals on a programmable controller.

output ANS: B PTS: 1 REF: EMC 5e-Sec 27-2

For a dual-voltage, wye-connected, 3-phase motor, the windings are ___-connected for the lower voltage.

parallel ANS: B PTS: 1 REF: EMC 5e-Sec 14-1

When signaling cables operating at low-voltage DC are installed in close proximity to AC cables, these cablesshould installed ___ to each other to minimize interference.

perpendicular ANS: B PTS: 1 REF: EMC 5e-Sec 27-2

You are sent on a service call to troubleshoot the control circuit shown in Figure 416-13. The circuit is suppliedfrom a safety switch (SS). You make the following observations.When the SS is turned ON, the red light comes immediately and the green light is OFF. After pushingeither START 1 or START 2, M will not engage, the green light stays OFF, and the red light stays ON.You turn the SS OFF and take the following resistance measurements: Point 17 to 7 shows 0.2 Point 9 to 4 shows OL (or ) Point 31 to 33 shows OL (or )Point 7 to 8 shows OL (or )Point 4 to 5 shows 0.2 Considering these measurements, you correctly decide that ___.

the starter coil is "bad" and needs to be replaced ANS: C PTS: 1 REF: EMC 5e-Sec 5-5