# An 8085 executes the following instructions 2710 LXI H, 30A0H 2713 DAD H 2714 PCHL All  addresses  and  constants  are  in Hex.  Let PC  be  the  contents  of  the  program  counter and HL be the contents of the HL register pair just after executing PCHL. Which of the following statements is correct

1.  PC = 2715H HL = 30A0H

2.  PC = 30A0H HL = 2715H

3.  PC = 6140H HL = 6140H

4.  PC = 6140H HL = 2715H

4

PC = 6140H

HL = 6140H

Explanation :
No Explanation available for this question

# An astable multivibrator circuit using IC 555 timer is shown below. Assume that the circuit is oscillating steadily The voltage Vc across the capacitor varies between

1.  3V to 5V

2.  3V to 6V

3.  3.6V to 6V

4.  3.6V to 5V

4

3V to 6V

Explanation :
No Explanation available for this question

# Silicon is doped with boron to a concentration of 4 x 1017 atoms cm3. Assume the intrinsic carrier concentration of silicon to be 1.5 x 1010/cm3 and the value of (kT)/q to be 25 mV at 300 k.Compared to undoped silicon, the Fermi level of doped silicon

1.  goes down by 0.13 eV

2.  goes up by 0.13 eV

3.  goes down by 0.427 eV

4.  goes up by 0.427 eV

4

goes down by 0.427 eV

Explanation :
No Explanation available for this question

# What are  the minimum number of 2  to 1 multiplexers required  to generate a 2  input AND gate and a 2 input Ex-OR gate

1.  1 and 2

2.  1 and 3

3.  1 and 1

4.  2 and 2

4

1 and 2

Explanation :
No Explanation available for this question

# The cross section of a JFET  is shown  in  the  following  figure. Let VG be -2V and  let Vp  be the  initial pinch-off  voltage.  If  the width W  is doubled  (with other geometrical parameters and  doping  levels  remaining  the  same),  then  the  ratio  between  the  mutual transconductances of the initial and the modified JFET is

1.  4

2.  0

3.

4.

4

Explanation :
No Explanation available for this question

# Refer  to  the NAND and NOR  latches shown  in  the  figure. The  inputs (P1, P2)  for both the  latches  are  first  made  (0,  1)  and  then,  after  a  few  seconds,  made  (1,  1).  The corresponding stable outputs (Q1, Q2) are

1.  NAND: first (0, 1) then (0, 1) NOR: first (1, 0) then (0, 0)

2.  NAND: first (1, 0) then (1, 0) NOR: first (1, 0) then (1, 0)

3.  NAND: first (1, 0) then (1, 0) NOR: first (1, 0) then (0, 0)

4.  NAND: first (1, 0) then (1, 1) NOR: first (0, 1) then (0, 1)

4

NAND: first (1, 0) then (1, 0) NOR: first (1, 0) then (0, 0)

Explanation :
No Explanation available for this question

# Consider the Schmidt trigger circuit shown below A  triangular wave which  goes  from  -12 V  to  12 V  is  applied  to  the  inverting  input  of  the OPAMP. Assume that the output of the OPAMP swings from +15V to -15V. The voltage at the non-inverting input switches between

1.  -12V and +12 V

2.  -7.5V and -7.5V

3.  -5V and +5V

4.  0V and 5V

4

0V and 5V

Explanation :
No Explanation available for this question

# What are the counting stages (Q1, Q2) for the counter shown in the figure below

1.  11, 10, 00, 11, 10, ....

2.  01, 10, 11, 00, 01, ....

3.  00, 11, 01, 10, 00, ....

4.  01, 10, 00, 01, 10, ....

4

11, 10, 00, 11, 10, ....

Explanation :
No Explanation available for this question

# The logic function implemented by the following circuit at the terminal OUT is

1.  P NOR Q

2.  P NAND Q

3.  P OR Q

4.  P AND Q

4

P OR Q

Explanation :
No Explanation available for this question

# A system with transfer function H(z) has impulse response h(.) defined as h(2) = 1, h(3) = -1 and h(k) = 0 otherwise. Consider the following statements S1 : H (z) is a low pass filter S2 : H (z) is a FIR filter Which of the following is correct

1.  Only S2 is true

2.  Both S1 and S2 are false

3.  Both S1 and S2 are true, and S2 is a reason for S1

4.  Both S1 and S2 are true, but S2 is not a reason for S1

4