CWEA E/I Level 3 Test Practice (100 OUT OF 100) Questions and Answers (GRADED A+)

If the potential difference across the coil is low, the coil will: A-draw too much current B-become too hot C-Produce too much magnetic force D-not heat up D-not heat up The NEC identifies environments that contain flammable vapors and gases as which class of hazardous location? A-Class I B-Class II C-Class III D-Class IV A-Class I Which of the following reduces high voltages and currents to save values for measurements? A-auto transformer B-megohmmeter C-instrument transformer D-variable transformer C-instrument transformer In a three wire control circuit, when a power failure occurs: A-The interlock contact will close the circuit B-The operator can restart the meter automatically C-The motor can restart unexpectedly D-The operator must restart the meter manually D-The operator must restart the meter manually Push buttons are classified as standard duty or heavy duty according to the: A-Kind of enclosure B-Service conditions C-frequency operation D-Current carrying ability D-Current carrying ability He push to test pilot light is used in applications where the pilot light is: A-rarely needed B-A neon bulb C-used in DC applications D-in constant use A-rarely needed The advantage of LCDs over LEDs is: A-accuracy B-better visibility C-lower power consumption D-sensitivity C-lower power consumption Shielding protects an analog meter from: a. damage due to careless handling. b. harmful UV rays. c. over-current and surges. d. stray magnetic fields. d. stray magnetic fields. An ammeter should be connected: a. across the line. b. around an inductor. c. in parallel with the load. d. in series with the load. d. in series with the load. Bar graphs and wave forms can be displayed on a LCD screen when the multimeter has: a. analog/digital circuits. b. microprocessor circuitry. c. opposing coils and a commutator. d. parallel ports. b. microprocessor circuitry. The difference between the squirrel-cage rotor and the wound rotor is in: a. their pole-phase groups. b. how the conductors are connected. c. how the current is induced in the conductors. d. all of the above. b. how the conductors are connected. The frame, the core, the winding, and the end plates are all parts of the: a. rotor. b. stator. c. alternator. d. induction motor b. stator. Which of the following is a sign of overheating rotor bars? a. Reduced starting torque. b. Noise. c. Discoloration. d. All of the above. c. Discoloration. Two sources of power, one AC and one DC, are required for running a(n): a. induction motor. b. squirrel-cage motor. c. synchronous motor. d. wound-rotor motor. c. synchronous motor. Modern synchronous motors have: a. both brushes and slip rings. b. brushes, but no slip rings. c. slip rings, but no brushes. d. neither brushes nor slip rings. d. neither brushes nor slip rings. All the following are true of 240-volt systems compared to 480-volt systems, except: a. they cost more to operate. b. they require more current per unit of power. c. they require smaller circuit breakers. d. they are safer. c. they require smaller circuit breakers. If a charged capacitor is removed from a circuit, the capacitor: a. retains its charge. b. loses some of its charge. c. loses most of its charge. d. loses all of its charge. a. retains its charge. Control systems are usually designed so that each individual circuit controls: a. all functions of the machine. b. at least two functions. c. only one function. d. only one device. c. only one function. A 115-volt, 2-KVA, single-phase generator operating at full load will deliver how many amperes? a. 0.23 b. 17.4 c. 57.5 d. 230 b. 17.4 What is the current when a circuit has a 1,500- watt load and a power factor of 86%, and operates from a three-phase 230-volt source? a. 9.7 amps b. 6.5 amps c. 4.4 amps d. 3.8 amps c. 4.4 amps What is the amp-load of a three-phase, 0.5-hp, 230-volt motor with an efficiency rating of 92% and a power factor of 80%? a. 1.27 amps b. 1.19 amps c. 2.55 amps c. 4.41 amps a. 1.27 amps A three-phase, 460-volt motor draws a current of 52 amperes. The motor has an efficiency rating of 94% and a power factor of 80%. What is the horsepower? a. 24.1 hp b. 41.7 hp c. 50.0 hp d. 73.8 hp b. 41.7 hp A 120-volt AC circuit draws a current of 5 amperes. Determine the power consumption. a. 60 watts b. 120 watts c. 4.8 watts d. 600 watts d. 600 watts In a simple ratio system, the independent variable is: a. both measured and controlled. b. controlled but not measured. c. measured but not controlled. d. neither measured nor controlled. c. measured but not controlled. The root-mean-square method is used to calculate: a. integral and derivative action. b. proportional band or gain. c. system accuracy. d. transducer bias c. system accuracy. To simulate an RTD input, you use a: a. digital VOM. b. potentiometer. c. resistance decade box. d. wally box. c. resistance decade box. SCADA systems typically span: a. an entire plant. b. many miles. c. part of the plant. d. up to 5,000 feet. b. many miles. In the ISA tag PIC-21, the P stands for: a. Positive. b. Pressure. c. Process. d. Proportional. b. Pressure. The outputs of a digital transducer are in the form of: a. 1 to 5 mv. b. 4 to 20 ma. c. digital computer words. d. on or off signals. c. digital computer words. A shield around the signal lead is the most effective protection against: a. impedance. b. unwanted conductance. c. noise. d. inverted sources. c. noise. The most important consideration in loop control is: a. accessibility. b. accuracy. c. cost. d. response. d. response. Which element makes a programmable logic controller system flexible? a. Memory. b. I/O. c. Program. d. Power supply. c. Program. Local I/O expansion involves the addition of: a. a second processor. b. a shift register. c. data-handling capabilities. d. I/O points within the rack. d. I/O points within the rack. A major cause of problems in multi-layer printed circuit boards is: a. age. b. corrosion. c. interlayer separation. d. overheating. c. interlayer separation. A software problem that causes incorrect results is called a: a. bug. b. crash. c. glitch. d. spike a. bug. The CPU of a microcomputer is a(n): a. ALU. b. microcontroller. c. microprocessor. d. printed circuit assembly. c. microprocessor. Where is a computer's start-up program usually stored? a. In RAM b. In ROM c. On disk d. On magnetic tape b. In ROM How many signal conditions can digital I/O devices have? a. One b. Two c. Eight d. An infinite number b. Two A CDU (Command and Display Unit) computer screen that senses finger pressure is: a. a digitizer. b. an intelligent terminal. c. a scanner. d. a touch screen. d. a touch screen. Which of the following is not a goal of a microprocessor-based engine control system? a. Better engine performance b. Better fuel economy c. Lower exhaust emissions. d. Lower noise emissions d. Lower noise emissions The RS232C standard applies to what type of digital data transmission? a. Balanced b. Fiber optic c. Parallel d. Serial d. Serial 10°C is equal to how many degrees Fahrenheit? a. 23.3°F b. 50°F c. 75.6°F d. - 47.6°F b. 50°F What is the volume of a cylinder with a 40-foot diameter and height of 23 feet? a. 1,444 cu ft b. 7,222 cu ft c. 28,888 cu ft d. 33,221 cu ft c. 28,888 cu ft One gallon of water weighs 8.34 pounds and one cubic foot contains 7.48 gallons of water. A fish tank measures 36 inches long, 24 inches wide and 20 inches high. How many pounds of water will be in the fish tank? a. 64.4 lbs b. 74.8 lbs c. 83.4 lbs d. 624 lbs d. 624 lbs To select the proper protection for a motor, you need to know all the following except the: a. ambient temperature. b. full-load current rating. c. service factor. d. time rating. a. ambient temperature. An on-off switch with overload relays is called a: a. magnetic control. b. manual starter. c. reversing starter. d. combination starter. b. manual starter. Hydraulic actuators: a. can produce very large thrust. b. offer an indirect response to input. c. require almost no maintenance. d. usually use water as the fluid. a. can produce very large thrust. Scheduling should precede: a. planning. b. material procurement. c. workload balancing. d. job execution. d. job execution. Which of the following should you NOT do after giving your crew instructions? a. Repeat key points b. Justify your instructions c. Refuse to change assignments d. Seek further information on a job c. Refuse to change assignments The surest way to get feedback is through: a. a suggestion box. b. the company newsletter. c. asking questions. d. All of the above c. asking questions. The best way to motivate a crew is though: a. force. b. playing favorites. c. recognition. d. threats. c. recognition.