| 1 |
A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec
and the sampled signal is passed through an, ideal low-pass filter
with cut-off frequency 800 Hz.
The output signal has the frequency
|
| Options |
| A) zero Hz |
B) 0.75 kHz |
| C) 0.5 kHz |
D) 0.25 kHz |
|
|
|
| Correct Answer |
C |
|
| 2 |
The minimum number of 2-to -1 multiplexers
required to realize a 4-to 1 multiplexer is
|
| Options |
|
|
|
| Correct Answer |
B |
|
| 3 |
Choose the correct one front among the
alternatives A, B, C, D after matching an item from Group 1 with the
most appropriate item, in Group 2.
| Group 1 |
Group 2 |
| P: Shift register |
1:Frequency division |
| Q: Counter |
2: Addressingin memory chips |
| R: Decoder |
3: Serial to parallel data conversion |
|
| Options |
| A) P-3, Q- 2, R-1 |
B) P-3, Q-1, R-2 |
| C) P-2, Q-1, R-3 |
D) P-1, Q- 2, R-2 |
|
|
|
| Correct Answer |
B |
|
| 4 |
A random variable X with uniform density in the
interval 0 to 1 is quantized as follows:
If 0 £ X £
0.3, xq = 0
If 0.3 £ X £ 1,
xq = 0.7
where xq is the quantized value of X.
The root-mean square value of the quantization noise is |
| Options |
| A) 0.573 |
B) 0.198 |
| C) 2.205 |
D) 0.266 |
|
|
|
| Correct Answer |
A |
|
| 5 |
In a full-wave rectifier using two ideal
diodes, Vdc and Vm are the dc and peak values
of the voltage respectively across a resistive load. If PIV is the
peak inverse voltage of the diode, then the appropriate
relationships for this rectifier are
|
| Options |
| A)
Vdc =
, PIV = 2Vm |
B) Vdc = 2
, PIV = 2Vm |
| C) Vdc = 2
, PIV = Vm |
D) Vdc =
, PIV = Vm |
|
|
|
| Correct Answer |
B |
|
| 6 |
The Fourier transform of a conjugate symmetric
function is always
|
| Options |
| A) imaginary |
B) conjugate anti-symmetric
|
| C) real |
D) conjugate symmetric |
|
|
|
| Correct Answer |
C |
|
| 7 |
It is desired to multiply the numbers 0AH by
0BH and store the result in the accumulator. The numbers are
available in registers B and C respectively. A Part of
the 8085 program for this purpose is given below:
MVI A, 00H
Loop;- - - - - - - - -
--------------------
-------------------
HLT END
The sequence of instruction to the complete the program would be |
| Options |
| A) JNZ LOOP, ADD B, DCR C |
B) ADD S, JNZ LOOP, DCR C |
| C) DCR C, JNZ LOOP, ADD B |
D) ADD B, DCR C, JNZ LOOP |
|
|
|
| Correct Answer |
D |
|
| 8 |
A solution of the following differential equation is given by
-
+ 6y = 0 |
| Options |
| A)
y = e2x + e-3x
|
B)
y = e2x + e3x
|
| C)
y = e-2x + e3x
|
D)
y = e-2x + e-3x
|
|
|
|
| Correct Answer |
B |
|
| 9 |
Consider the following statements S1 and S2.
S1: The threshold voltage (VT) of a MOS capacitor
decreases with increase in gate oxide thickness
S2: The threshold voltage (VT) of a MOS capacitor
decreases with increase in substrate doping concentration
Which one of the following is correct?
|
| Options |
A) S1 is FALSE and S2 is TRUE
|
B) Both S1 and S2 are TRUE |
C) Both S1 and S2 are FALSE
|
D) S1 is TRUE and S2 is FALSE |
|
|
|
| Correct Answer |
A |
|
| 10 |
Consider an abrupt p-junction. Let Vbi
be the built-in potential of this junction and VR be the
applied reverse bias. If the junction capacitance (Cj) is
1 pF for
Vbi + VR = 1V, then for Vbi + VR
- 4V, Cj will be
|
| Options |
| A) 4 pF |
B) 2 pF |
| C) 0.25 pF |
D) 0.5 pF |
|
|
|
| Correct Answer |
D |