In direct coupled FET logic, both depletion and enhancement mode devices are used.

The Transfer characteristic of the different types of MOSFETs is shown below, where ID is drain current and VGS is the Gate-Source voltage, the correct combination of MOSFET w.r.t to transfer characteristics is: Types of MOSFET (P) P – Channel Enhancement MOSFET (Q) P – Channel Depletion MOSFET (R) N – Channel Enhancement MOSFET (S) N – Channel Depletion MOSFET

A

P – 4, Q – 2, R – 1, S – 3

B

P – 3, Q – 2, R – 4, S – 1

C

P – 1, Q – 3, R – 2, S – 4

D

P – 2, Q – 4, R – 3, S - 1

In which of the below-mentioned logic families, the transistors operate between cut-off and active (non-saturation) states? (i) Transistor-Transistor Logic (TTL) (ii) Schottky TTL (iii) Diode Transistor Logic (DTL) (iv) Emitter Coupled Logic (ECL) Choose the correct answer from the code given below: Code:

A

(i) and (iii) are correct

B

(ii) and (iii) are correct

C

(i) and (iv) are correct

D

(ii) and (iv) are correct

Enhancement mode device acts as ____ switch, depletion mode acts as _____ switch.

A

open, closed

B

closed, open

C

open, open

D

close, close

Maximum voltage across enhancement mode device corresponds to minimum voltage across depletion mode device.

A

true

B

false

The depletion mode n-MOS differs from enhancement mode n-MOS in:

A

Threshold voltage

B

Channel Length

C

Switching time

D

None of the mentioned

Enhancement mode device acts as . . . . . . . . . switch, depletion mode acts as . . . . . . . . switch.

A

Open, Closed

B

Closed, Open

C

Open, Open

D

Close, Close

Which one of the following is true with regard to a CPU having a single interrupt request line and single interrupt grant line? i) Neither vectored nor multiple interrupting devices is possible. ii) Vectored interrupts is not possible but multiple interrupting devices is possible. iii) Vectored interrupts is possible and multiple interrupting devices is not possible. iv) Both vectored and multiple interrupting devices are possible.

A

iii

B

i, iv

C

ii, iii

D

iii, iv

A diode had a transition capacitance of 1pF and depletion width of 1 µm. The capacitance changes to 10 pF when the depletion width changes. The final depletion width is __________

A

10 µm

B

0.1 µm

C

1 µm

D

100 µm

Microcontrollers are used in automatically controlled products and devices, such as automobile engine control systems, implantable medical devices, remote controls, office machines, appliances, power tools, toys and other embedded systems. By reducing the size and cost compared to a design that uses a separate microprocessor, memory, and input/output devices, microcontrollers make it economical to digitally control even more devices and processes. Mixed signal microcontrollers are common, integrating analog components needed to control non-digital electronic systems. What inference can be drawn from the above?

A

All automatically controlled products and devices have microcontrollers.

B

Microcontrollers save money.

C

Both option 1 and option 2

D

Neither option 1 nor option 2

Post office protocol (POP) is a message access protocol which is used to extract message for client. In this regard, which of the following are true ? (A) POP has two modes, Delete mode and keep (B) In Delete mode, mail is deleted from mail box after each retrival (C) In Delete mode, mail is deleted from mail box before each retrieval (D) In keep mode, mail is deleted before retrival (E) In keep mode, mail remains in mail box after retrival Choose the correct answer from the options given below:

A

(A) and (B) only

B

(A), (D) and (E) only

C

(A), (B), (C) and (D) only

D

(A), (B) and (E) only

In direct coupled FET logic, both depletion and enhancement mode devices are used.

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