# A linear discrete time system has the characteristic equation Z3-0.81=0. The system

1.  Is stable

2.  Is marginally stable

3.   Is unstable

4.  Stability cannot be assessed from the given information

4

Is stable

Explanation :
No Explanation available for this question

# For this process

1.  The integral mode improves transient performance

2.  The integral mode improves steady – state performance

3.  The derivative mode improves transient performance

4.   The derivative mode improves steady-state performance.

4

The derivative mode improves transient performance

Explanation :
No Explanation available for this question

# A semiconductor is irradiated with light such that carriers are uniformly generated throughout its volume. The semiconductor is n-type with ND = 1019 per cm3. If the excess electron concentration in the steady state is= 1015 per cm3 and if tp =10  sec (minority carrier life time) the generation rate dueto irradiation

1.  is 1020 e-h pairs/cm3/s

2.  is 1024 e-h pairs/cm3/s

3.  is 1010 e-h pairs/cm3/s

4.  cannot be determined as the given data is insufficient.

4

is 1020 e-h pairs/cm3/s

Explanation :
No Explanation available for this question

# A P-N junction series with a 100 ohms resistor is forward based so that a current of 100 mA flows. If the voltage across this combination instantaneously reversed to 10 V at t=0, the reverse current that flows through the diode at t=0 approximately given by

1.  0 mA

2.  100 mA

3.  200 mA

4.  50 mA

4

100 mA

Explanation :
No Explanation available for this question

# An infrared LED is usually fabricated from

1.  Ge

2.  Si

3.  Ga As

4.  Ga As P

4

Ga As

Explanation :
No Explanation available for this question

# The JEFT in the circuit shown in the given figure has an IDSS=10 mA and Vp=5V.The value of the resistance Rs for a drain current IDS=6.4mA is (select the nearest value)

1.  150 ohms

2.  470 ohms

3.  560 ohms

4.  1 kilo ohms

4

150 ohms

Explanation :
No Explanation available for this question

# An op.amp.has an offset voltage of 1mV and is ideal in all other respects. If this op.amp.is   used in the circuit shown  in the given figure,the output voltage will be (select the nearest value)[

1.  1 mV

2.  1V

3.  ± 1

4.  0V

4

± 1

Explanation :
No Explanation available for this question

# The 6 V Zener diode shown in given figure has zero zenar resistance and a knee current of    5mA.The minimum value of R so that the voltage across it does not fall below 6V is

1.  1.2K ohms

2.  80 ohms

3.  50 ohms

4.  0 ohms

4

1.2K ohms

Explanation :
No Explanation available for this question

# The logic realized by the circuit shown in given figure is

1.  F=A.C

2.  F=A+C

3.  F=B.C

4.  F=B+C

4

F=A+C

Explanation :
No Explanation available for this question

# Choose the correct statements(s) for the following

1.  PROM contains a programmable AND array and a fixed OR array

2.  PLA contains a fixed AND array and a programmable OR array

3.  PROM contains a fixed AND array and a programmable OR array

4.  PLA contains a programmable AND array and a programmable OR array

4