represent mosfet devices utilizing either p-channel or n- channel devices exclusively within a given gate

are enhancement -type cmos devices used to produce a series of high-speed logic known as 74hc

represent positive and negative mos-type devices, which can be operated from differential power supplies and are compatible with operational amplifiers

Digital Electronics and Logic Design MCQ Questions and answers

A

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Q. The rise time (tr) is the time it takes for a pulse to rise from its point up to its point. The fall time (tf) is the length of time it takes to fall from the to the point.

(A) 10%, 90%, 90%, 10%
(B) 90%, 10%, 10%, 90%
(C) 20%, 80%, 80%, 20%
(D) 10%, 70.7%, 70.7%, 10%

A

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Q. The term buffer/driver signifies the ability to provide low output currents to drive light loads.

(A) true
(B) false
(C) ---
(D) ---

A

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Q. PMOS and NMOS .

(A) represent mosfet devices utilizing either p-channel or n- channel devices exclusively within a given gate
(B) are enhancement -type cmos devices used to produce a series of high-speed logic known as 74hc
(C) represent positive and negative mos-type devices, which can be operated from differential power supplies and are compatible with operational amplifiers
(D) none of the above

A

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Q. Why is the operating frequency for CMOS devices critical for determining power dissipation?

(A) at low frequencies, at low frequencies, power dissipation increases.
(B) at high frequencies, the gate will only be able to deliver 70.7 % of rated power.
(C) at high frequencies, charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.
(D) at high frequencie s, the gate will only be able to deliver 70.7 % of rated power and charging and dischargin g the gate capacitanc e will draw a heavy current from the power supply and thus increase power dissipation .

A

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Q. Ten TTL loads per TTL driver is known as:

(A) noise immunity
(B) fan-out
(C) power dissipation
(D) propagatio n delay

A

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Q. The problem of different current requirements when CMOS logic circuits are driving TTL logic circuits can usually be overcome by the addition of:

(A) a cmos inverting bilateral switch between the stages
(B) a ttl tristate inverting buffer between the stages
(C) a cmos noninverting bilateral switch between the stages
(D) a cmos buffer or inverting buffer

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Q. Totem-pole outputs be connected because .

(A) can, in parallel, sometimes higher current is required
(B) cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
(C) should, in series, certain applications may require higher output voltage
(D) can, together, together they can handle larger load currents and higher output voltages

A

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Q. The high input impedance of MOSFETs:

(A) allows faster switching
(B) reduces input current and power dissipation
(C) prevents dense packing
(D) creates low-noise reactions

A

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Q. The output current capability of a single 7400 NAND gate when HIGH is called

(A) source current
(B) sink current
(C) ioh
(D) source current of ioh

A

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Q. The time needed for an output to change from the result of an input change is known as:

(A) noise immunity
(B) fan-out
(C) propagation delay
(D) rise time

Digital Electronics and Logic Design MCQs with answers Page - 18

Q. The rise time (tr) is the time it takes for a pulse to rise from its point up to its point. The fall time (tf) is the length of time it takes to fall from the to the point.

Q. The term buffer/driver signifies the ability to provide low output currents to drive light loads.

Q. PMOS and NMOS .

Q. Why is the operating frequency for CMOS devices critical for determining power dissipation?

Q. Ten TTL loads per TTL driver is known as:

Q. The problem of different current requirements when CMOS logic circuits are driving TTL logic circuits can usually be overcome by the addition of:

Q. Totem-pole outputs be connected because .

Q. The high input impedance of MOSFETs:

Q. The output current capability of a single 7400 NAND gate when HIGH is called

Q. The time needed for an output to change from the result of an input change is known as:

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