Industrial Maintenance Technician Test Questions and Answers(A+ Solution guide)

Which device do you use to measure voltage? - Answer-Multi Meter If you were asked to check out the I/O card on a plc, which card would you look at? - Answer-Input Card What does the term current refer to while dealing with electricity? - Answer-Amps On a hydraulic pump if you were told the pump is cavitating, what would you check for? - Answer-Low fluid in the tank In a 480 volt three phase system, what would your meter read if you went from one leg to ground? - Answer-277 WHICH TOOL IS USED WHEN MEASURING SCREW PITCH - Answer-Thread Gauge What is a circuit breaker? - Answer-an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. What does a D.P.S.T. switch refer to? - Answer-double pole single throw How many teeth are on a 40B12 sprocket? - Answer-12 The BCD equivalent of 1247 converts to_____. - Answer- What is the binary value of the following terms: Word and Nibble - Answer-16 digit and 4 digit What type of programming is used by PLCs. - Answer-ladder logicWhat is the Octal and Hexadecimal= 0-9,A,B,C,D,E,F equivalent for the decimal numbers 1-15 - Answer-0- 7, 10-17, 20... and 0-9,A,B,C,D,E,F Typical BCD input devices include ____. - Answer-thumbwheel switches BCD code stands for _____. - Answer-binary coded decimal The decimal 1000 has a Weighted Value Position of ______. - Answer-3 If in binary a zero signifies an OFF state a one signifies____________. - Answer-an ON state How many symbols are in the octal number system? - Answer-8 To convert from binary to octal, you select bits in groups of ____ - Answer-3 A register or word is composed of ____. - Answer-sixteen bits or two bytes. The two basic sections of a PLC are the - Answer-the central processing unit and the input/output system State the primary sections of PLCs . - Answer-Input modules, (CPU) Central Processing Unit, Output modules, Programming device, Operator Interface Device PLC Input modules convert_______________ - Answer-signals(analog or discrete/digital) provided by various switches and sensors into logic that can be used by the CPU What solid state device is associated with the term "avalanche effect"? - Answer-Zener diode The SCR is equivalent to what electronic device? - Answer-thyristorWhat does the PLC Central Processing unit ( CPU) do? - Answer-evaluates the status of inputs, outputs, and other variables as it excutes a stored program. The CPU then sends signals to update the status of outputs. Describe the function of Output Modules - Answer-Output Modules convert control signals from the CPU into digital or analog values that can be used to control various outputs What is the Programming Device used for? - Answer-it is used to enter or change the PLCs program or to monitor or change stored values. Once entered the program and associated variables are stored in the CPU Discrete inputs and outputs, also referred to as digital inputs and outputs are_______________ - Answer-either ON or OFF. High or Low Pushbuttons, toggle, switches, limit switches, proximity switches, and relay contacts are all examples of______________ - Answer-devices that are often connected to PLC discrete inputs. Solenoids, relay and contactor coils, and indicator lamps are examples of______ - Answer-devices often connected to PLC discrete outputs. In the on condtion, a discrete inout or output is represented internal to the PLC as_______ - Answer-a logic 1 : In the off condition, a discrete input or output is represented as_____ - Answer-a logic 0 Analog Inputs/Outputs are____________ - Answer-continuous, variable signals