true false Flashcards
(19 cards)
Modern CPU clock speeds are in the range of 2 to 10 MHz (“Megahertz”).
False
Integrated circuits are fabricated on thin wafers of polycrystalline silicon.
False: should be monocrystalline
Photo-resist layers become electrically conductive when exposed to UV light, allowing
fabricators to create electronic circuits on silicon wafers.
False: Its the copper that is plated on that conducts the electricity!!!
A transistor requires 3 electrical connections to operate
T - the source, drain and gate
A potential applied to a transistor’s Collector allows a current to flow between the Base and
Emitter connections.
BS! the potential is applied to the ‘gate’ which then allows current to flow from the source to the drain
An OR gate has two transistors connected in parallel
True
An AND gate has two transistors connected in parallel
False: they are connected in series
The NOT gate works by using a single transistor and a resistor. If the transistor is off, then the current be forced to flow through the resistor causing a true
True
A nor gate has 3 transistors connected in parallel with a resistor to invert the input
False: it has 2 transistors connected in parallel and one resistor
A NAND gate has two transistors connected in series and the resistor set up to invert the input
True
XOR gates work so that there must be one and only one of the inputs that are true. It ‘must’ be or.
True
A*B means…
A AND B
A+B means…
A OR B
Half bit adders add the two rows (each row is a number) of binary digits together with the carry input to produce an output
False - half bit adders don’t take carry digits as input
Full bit adders take the two binary digits being added as well as the carry input digit
True
XOR gates have 8 transistors
True
half bit adders use 10 transistors
True
full bit adders use 22 transistors
True
index method returns _______ when supplied with a value that is not in the string
returns nothing - raises error message
