Digital Electronics Set 13
On This Page
This set of Digital Electronics Multiple Choice Questions & Answers (MCQs) focuses on Digital Electronics Set 13
Q1 | The full form of SR is
- system rated
- set reset
- set ready
- set rated
Q2 | The SR latch consists of
- 1 input
- 2 inputs
- 3 inputs
- 4 inputs
Q3 | The outputs of SR latch are
- x and y
- a and b
- s and r
- q and q’
Q4 | The NAND latch works when both inputs are
- 1
- 0
- inverted
- don’t cares
Q5 | The first step of analysis procedure of SR latch is to
- label inputs
- label outputs
- label states
- label tables
Q6 | The inputs of SR latch are
- x and y
- a and b
- s and r
- j and k
Q7 | When a high is applied to the Set line of an SR latch, then
- q output goes high
- q’ output goes high
- q output goes low
- both q and q’ go high
Q8 | When both inputs of SR latches are low, the latch
- q output goes high
- q’ output goes high
- it remains in its previously set or reset state
- it goes to its next set or reset state
Q9 | When both inputs of SR latches are high, the latch goes
- unstable
- stable
- metastable
- bistable
Q10 | Which of the following logic families has the highest maximum clock frequency?
- s-ttl
- as-ttl
- hs-ttl
- hcmos
Q11 | Why is the fan-out of CMOS gates frequency dependent?
- each cmos input gate has a specific propagation time and this limits the number of different gates that can be connected to the output of a cmos gate
- when the frequency reaches the critical value the gate will only be capable of delivering 70% of the normal output voltage and consequently the output power will be one-half of normal and this defines the upper operating frequency
- the higher number of gates attached to the output the more frequently they will have to be serviced thus reducing the frequency at which each will be serviced with an input signal
- the input gates of the fets are predominantly capacitive and as the signal frequency increases the capacitive loading also increases thereby limiting the number of loads that may be attached to the output of the driving gate
Q12 | Logic circuits that are designated as buffers, drivers or buffers/drivers are designed to have:
- a greater current/voltage capability than an ordinary logic circuit
- greater input current/voltage capability than an ordinary logic circuit
- a smaller output current/voltage capability than an ordinary logic
- greater the input and output current/voltage capability than an ordinary logic circuit
Q13 | Which of the following will not normally be found on a data sheet?
- minimum high level output voltage
- maximum low level output voltage
- minimum low level output voltage
- maximum high level input current
Q14 | Which of the following logic families has the shortest propagation delay?
- s-ttl
- as-ttl
- hs-ttl
- hcmos
Q15 | What is the static charge that can be stored by your body as you walk across a carpet?
- 300 volts
- 3000 volts
- 30000 volts
- over 30000 volts
Q16 | What must be done to interface TTL to CMOS?
- a dropping resistor must be used on the cmos of 12 v supply to reduce it to 5 v for the ttl
- as long as the cmos supply voltage is 5 v they can be interfaced (however, the fan- out of the ttl is limited to five cmos gates)
- a 5 v zener diode must be placed across the inputs of the ttl gates in order to protect them from the higher output voltages of the cmos gates
- a pull-up resistor must be used between the ttl output-cmos input node and vcc; the value of rp will depend on the number of cmos gates connected to the node
Q17 | What causes low-power Schottky TTL to use less power than the 74XX series TTL?
- the schottky-clamped transistor
- a larger value resistor
- the schottky-clamped mosfet
- a small value resistor
Q18 | What are the major differences between the 5400 and 7400 series of ICs?
- the 5400 series are military grade and require tighter supply voltages and temperatures
- the 5400 series are military grade and allow for a wider range of supply voltages and temperatures
- the 7400 series are an improvement over the original 5400s
- the 7400 series was originally developed by texas instruments and the 5400 series was brought out by national semiconductors after ti’s patents expired as a second supply source
Q19 | 3 CYCLES AND RACES, STATE REDUCTION
- 1
- 2
- 3
- 4
Q20 | Memory is a/an
- device to collect data from other computer
- block of data to keep data separately
- indispensable part of computer
- device to connect through all over the world
Q21 | The instruction used in a program for executing them is stored in the
- cpu
- control unit
- memory
- microprocessor
Q22 | A register file holds
- a large number of word of information
- a small number of word of information
- a large number of programs
- a modest number of words of information
Q23 | The very first computer memory consisted of
- a small display
- a large memory storage equipment
- an automatic keyboard input
- an automatic mouse input
Q24 | A flip flop stores
- 10 bit of information
- 1 bit of information
- 2 bit of information
- 3-bit information
Q25 | Which one of the following has capability to store data in extremely high densities?
- register
- capacitor
- semiconductor
- flip-flop