PLCs and Manufacturing Exam

True/False
Indicate whether the statement is true or false.

____	1.	Mechanical relays have an indefinite lifespan

____	2.	ROM stands for Read Only Memory because the information stored in ROM cannot be changed.

____	3.	PLCs are immune to RFI, Radio Frequency Interference.

____	4.	Boolean logic can be used to effect a wide variety of inputs, outputs, control over equipment, and manufacturing production by boiling all actions down to a simple ON / OFF; 0 /1.

____	5.	Using the three basic types of logic chips, up to seven different logic gates can be produced.

____	6.	Counters are components that are useful in PLC systems, but only if counting in a progressively upward, or forward direction, such as 1,2,3,4,5.........

____	7.	Timers and counters in PLCs are software based.

Multiple Choice
Identify the choice that best completes the statement or answers the question.

____	8.	PLCs were created to replace bulky relay circuits that have been around since
a.	the early 1700’s	c.	the early 1900’s	
b.	the early 1800’s	d.	2001	

____	9.	The brain of a PLC system is its
a.	microprocessor	c.	programming ladder	
b.	electrionic relays	d.	input and output sensors	

____	10.	Instructions are stored here during operations
a.	Microprocessor	c.	RAM	
b.	ROM	d.	electronic buses	

____	11.	A type of ROM in which the information held within can be changed is called
a.	NVRAM	c.	EEPROM	
b.	Static ROM	d.	Flash Ram	

____	12.	A common output module is the:
a.	LED	c.	solenoid	
b.	Relay	d.	all of the above	

____	13.	2 to the 8th power is:
a.	8	c.	128	
b.	16	d.	256	

____	14.	There are three basic logic chips used in boolean logic circuits.
a.	ANDs, NANDs, and NORs	c.	ANDs, ORs, and NOTs	
b.	ANDs, NOTs, and NORs	d.	NANDS, NORs, and SMORES	

____	15.	AND gates require a TRUE signal (1) on:
a.	two input leads	c.	one input lead	
b.	three input leads	d.	all input leads	

____	16.	OR gates require_________________ in order to have a TRUE (1) output.
a.	one input to be true	c.	one true and one false input	
b.	two or more inputs to be true	d.	all false inputs	

Completion
Complete each statement.

	17.	A string of 8 bits used together for information is called a ______________-.

	18.	A NOT gate is also called an _________________ gate, since it will invert an output signal to the opposite of whatever signal comes through the input.

	19.	A NOT gate added to the output of an AND gate produces a __________ gate.

	20.	When producing a ladder logic program for a PLC system, you must finish the program with _______ or it is  incomplete and the system will not know when to stop.

PLCs and Manufacturing Exam
Answer Section

TRUE/FALSE

	1.	ANS:	F	PTS:	1

	2.	ANS:	T	PTS:	1

	3.	ANS:	F	PTS:	1

	4.	ANS:	T	PTS:	1

	5.	ANS:	T	PTS:	1

	6.	ANS:	F	PTS:	1

	7.	ANS:	T	PTS:	1

MULTIPLE CHOICE

	8.	ANS:	B	PTS:	1

	9.	ANS:	A	PTS:	1

	10.	ANS:	C	PTS:	1

	11.	ANS:	C	PTS:	1

	12.	ANS:	D	PTS:	1

	13.	ANS:	D	PTS:	1

	14.	ANS:	C	PTS:	1

	15.	ANS:	D	PTS:	1

	16.	ANS:	A	PTS:	1

COMPLETION

	17.	ANS:	byte

PTS:	1

	18.	ANS:	inverse

PTS:	1

	19.	ANS:	NAND

PTS:	1

	20.	ANS:	END

PTS:	1