Download Industrial Maintenance Technician Test – Comprehensive Practice Questions with Correct Ans and more Exams Electrical and Electronics Engineering in PDF only on Docsity!
Industrial Maintenance Technician Test –
Comprehensive Practice Questions with
Correct Answers(Rated 100%)
Which device do you use to measure voltage? - ** Multi Meter If you were asked to check out the I/O card on a plc, which card would you look at? - ** Input Card What does the term current refer to while dealing with electricity? - ** Amps On a hydraulic pump if you were told the pump is cavitating, what would you check for? - ** 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? - ** 277 WHICH TOOL IS USED WHEN MEASURING SCREW PITCH - ** Thread Gauge What is a circuit breaker? - ** 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? - ** double pole single throw How many teeth are on a 40B12 sprocket? -
The BCD equivalent of 1247 converts to_____. - ** 0001 0010 0100 0111 What is the binary value of the following terms: Word and Nibble - ** 16 digit and 4 digit What type of programming is used by PLCs. - ** ladder logic What is the Octal and Hexadecimal= 0-9,A,B,C,D,E,F equivalent for the decimal numbers 1-15 - ** 0-7, 10-17, 20... and 0-9,A,B,C,D,E,F Typical BCD input devices include ____. - ** thumbwheel switches BCD code stands for _____. - ** binary coded decimal The decimal 1000 has a Weighted Value Position of ______. - ** 3 If in binary a zero signifies an OFF state a one signifies____________. - ** an ON state How many symbols are in the octal number system? - ** 8 To convert from binary to octal, you select bits in groups of ____ - ** 3
Discrete inputs and outputs, also referred to as digital inputs and outputs are_______________ - ** either ON or OFF. High or Low Pushbuttons, toggle, switches, limit switches, proximity switches, and relay contacts are all examples of______________ - ** devices that are often connected to PLC discrete inputs. Solenoids, relay and contactor coils, and indicator lamps are examples of______ - ** devices often connected to PLC discrete outputs. In the on condtion, a discrete inout or output is represented internal to the PLC as_______ - ** a logic 1 : In the off condition, a discrete input or output is represented as_____ - ** a logic 0 Analog Inputs/Outputs are____________ - ** continuous, variable signals Typical analog signals vary from ________ - ** 4 to 20 milliamps Advantages of PLCs are____________ - ** Smaller size, easier and faster system changes, integrated diagnostics, immediate documentation. The proximity switch _________ - ** senses the approach of a metallic machine part either by a magnetic or high frequency electromagnetic field. when objects are near by Calculate the synchronous speed of a rotating magnetic field created by the stator given the following information: # of poles: 4 frequency: 60Hz phases: 2 -
** srpm=120xF/P 120X60/4=1800srpm Four resistors having a value of 100 ohms each are connected in parallel. What is the total resistance of this circuit? - ** 1/100 + 1/100 +1/100 + 1/100= 25 ohms Identify ohms law - ** V= IR What is the purpose of the test equipment Galvanometer? - ** Type of Ammeter When using a multimeter to measure an output voltage, you should ensure that the dc voltage component does not exceed what maximum voltage? - ** .707% of full deflection What is a coulomb? - ** unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere. What is the decimal value of the highest symbol in the hexadecimal system? - ** F=15 0-9A-F What term describes the use of four binary digits to represent on decimal digit? - ** BCD Binary Code Decimal An electric motor has an apparent resistance of 15 ohms. If 8 amps of current are flowing through the motor, what is the connected voltage? - ** 120v Newly installed motor runs in reverse direction, state the suspected fault? - ** leads L1 and L3 may need to be reversed
List 3 primary reasons for lubrication. - ** seal out dirt and contaminants. reduce friction. prevent corrosion What does "N.P.T." stamped on the side of a Tap stand for? - ** National Pipe Thread Which motors are associated with the term Slip - ** Synchronous. The difference between the synchronous speed of the magnetic field, and the shaft rotating speed is slip Needle Valve - ** Regulate accurate flow control Ball Valve - ** Quick acting, 90* on/ off control. No Pressure drop Gate Valve - ** Used for isolation during fluid flow Globe Valve - ** A linear motion valve used to stop, start, and regulate fluid flow. Most common valve in a propulsion plant Check Valve - ** used to prevent backflow. Fluid flows in one direction butterfly valve - ** Start, stop, and regulates large flow at low pressure A device used to transfer heat energy from one fluid to another without direct contact is called a_______________________. -
** heat exchanger Fluid power which uses compressed air to affect mechanical motion is called _____________________. - ** Pneumatics A type of bearing used to withstand axial forces which push or pull along the bearing axis is called a __________________. - ** Thrust bearing A type of bearing designed to withstand forces perpendicular to the axis or shaft is called a __________________. - ** Radial bearing A type of bearing which uses long, thin cylinders to move in an oscillary motion rather than rotary__________________. - ** Needle bearing It is stated that 1 cubic foot of water weighs 62.4 pounds. Using Pascal's law for force, calculate the pressure on the bottom of the container. - ** 62.4/144in= .433lbft What are the five basic components associated to a Hydraulic system and discuss each of their functions? - ** 1.Reservoir-Holds the hydraulic fluid. 2.Pump-generates flow in the system.
- Valves- Controls the hydraulic fluid. 4 Actuators- Cylinders and Motors. 5- Connectors/Conductors-hook components together to form a system. Name 4 types of liquids used with Hydraulic systems. - ** petroleum based, phosphate ester, synthetic- fire resistant, water based- fire resistant
