1.
For a three-input OR gate, with the input waveforms as shown below, which
output waveform, is correct?
A. 
B. 
C. 
D. 
2.
Which of the figures in figure (a to d) is equivalent to figure (e)?
A. 
B. 
C. 
D. 
3.
How many Flip-Flops are required for a mod-16 counter?
A. 
B. 
C. 
D. 
4.
The digital logic family which has minimum power dissipation is
A. 
B. 
C. 
D. 
5.
Which of the following is the fastest logic
A. 
B. 
C. 
D. 
6.
If the input to T-flipflop is 100 Hz signal, the final output of the three T-flipflops in cascade is
A. 
B. 
C. 
D. 
7.
The result of adding hexadecimal number A6 to 3A is
A. 
B. 
C. 
D. 
8.
The Intel’s 8051 machine cycle width is 12 oscillator clock cycles. This is because,
A. 
Minimum time taken to execute any 8051 instruction is 12 clock cycles.
B. 
Maximum time taken to execute any 8051 instruction is 12 clock cycles.
C. 
To generate standard baud rates
D. 
9.
A ring counter consisting of five Flip-Flops will have
A. 
B. 
C. 
D. 
10.
In successive-approximation A/D converter, offset voltage equal to ½ LSB is added to the D/A converter’s output. This is done to
A. 
Improve the speed of operation.
B. 
Reduce the maximum quantization error.
C. 
Increase the number of bits at the output
D. 
Increase the range of input voltage that can be converted
11.
Consider a CMOS process for which tox = 15nm, μp = 350 cm2/V.s, and Vt = 0.7V. Its K`p = ________.
A. 
B. 
C. 
D. 
12.
Unity gain frequency of MOSFET is 60 MHz. It has internal capacitances, Cgs = 1.8 pF, Cgd = 0.7 pF. Its gm = ____________.
A. 
B. 
C. 
D. 
13.
The time constant of the output waveform for the circuit shown in Fig, = __________, when a step input voltage is applied at the input port
A. 
B. 
C. 
D. 
14.
The value of RE = _____________. Assume VBE = 0.7V at 1 mA.
A. 
B. 
C. 
D. 
15.
For the circuit the output voltage = _____________.
A. 
B. 
C. 
D. 
16.
Avalanche breakdown results basically due to ________.
A. 
B. 
Strong electric field across the junction
C. 
D. 
17.
In a transistor if β changes from 99 to 199, then α changes from [Blank] to [Blank]
18.
An amplifier without feedback has a gain of 100, and a distortion of 10%. The distortion needs to be reduced to 4% by providing suitable negative feedback. The amount of feedback should be =[Blank]%
19.
An FM wave is represented by VFM(t)=20 sin(2π x 106t+ 5 sin 2π x 104t). The bandwidth required =[Blank]KHz
20.
(1999) in Decimal=([Blank]) in Binary
21.
The analog signal in Q1 is sampled at the rate of 8,000 Hz, the sampled signal spectrum and its replicas centered at the frequencies __________
A. 
B. 
C. 
D. 
22.
The condition of the Shannon sampling theorem for practical signal reconstruction is
A. 
B. 
C. 
D. 
23.
Assuming that a 3-bit ADC channel accepts analog input ranging from 0 to 5 volts, determine the following: a. number of quantization levels b. step size of the quantizer or resolution
A. 
B. 
C. 
D. 
24.
The z-transform of the sequence defined by x(n) = u(n) – (0.5)n * u(n):
A. 
B. 
C. 
D. 
25.
1000 KHz carrier is modulated by 300 Hz audio sine wave. What will be the frequency present in the output?
A. 
B. 
C. 
D.