R.V.C.E - Electronics And Communication Technical Test - 1

40 Questions | By Sourabhs989 | Last updated: Mar 15, 2022 | Total Attempts: 154

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R.V.C.E - Electronics And Communication Technical Test - 1 - Quiz

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1.

For a three-input OR gate, with the input waveforms as shown below, which output waveform, is correct?
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
2.

Which of the figures in figure (a to d) is equivalent to figure (e)?
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
3.

How many Flip-Flops are required for a mod-16 counter?
- A.
  
  5
- B.
  
  6
- C.
  
  3
- D.
  
  4
4.

The digital logic family which has minimum power dissipation is
- A.
  
  TTL
- B.
  
  RTL
- C.
  
  DTL
- D.
  
  CMOS
5.

Which of the following is the fastest logic
- A.
  
  TTL
- B.
  
  ECL
- C.
  
  CMOS
- D.
  
  LSI
6.

If the input to T-flipflop is 100 Hz signal, the final output of the three T-flipflops in cascade is
- A.
  
  100 HZ
- B.
  
  500 HZ
- C.
  
  333 HZ
- D.
  
  12.5 HZ
7.

The result of adding hexadecimal number A6 to 3A is
- A.
  
  DD
- B.
  
  E0
- C.
  
  F0
- D.
  
  EF
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.
  
  None of these
9.

A ring counter consisting of five Flip-Flops will have
- A.
  
  5 States
- B.
  
  10 States
- C.
  
  32 States
- D.
  
  Infinite States
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.
  
  20.65 µA/V2
- B.
  
  80.50 µA/V2
- C.
  
  59.88 µA/V2
- D.
  
  NONE
12.

Unity gain frequency of MOSFET is 60 MHz. It has internal capacitances, Cgs = 1.8 pF, Cgd = 0.7 pF. Its gm = ____________.
- A.
  
  150 µA/V
- B.
  
  66 µA/V
- C.
  
  0.414 mA/V
- D.
  
  0.942 mA/V
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.
  
  0.02
- B.
  
  0.01482
- C.
  
  0.07
- D.
  
  None
14.

The value of RE = _____________. Assume VBE = 0.7V at 1 mA.
- A.
  
  11.96 kΩ
- B.
  
  1.196 kΩ
- C.
  
  5.98 kΩ
- D.
  
  59.8 kΩ
15.

For the circuit the output voltage = _____________.
- A.
  
  -4 V
- B.
  
  12 V
- C.
  
  -16 V
- D.
  
  8 V
16.

Avalanche breakdown results basically due to ________.
- A.
  
  Impact ionisation
- B.
  
  Strong electric field across the junction
- C.
  
  Emission of electrons
- D.
  
  Rise in temperature
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.
  
  ± nfs
- B.
  
  -nfs
- C.
  
  +nfs
- D.
  
  Fs
22.

The condition of the Shannon sampling theorem for practical signal reconstruction is
- A.
  
  F s < 2f max
- B.
  
  F s > 2f max
- C.
  
  F s = 2f max
- D.
  
  None
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.
  
  3 and 1.667
- B.
  
  3 and 0.625
- C.
  
  8 and 0.625
- D.
  
  8 and 1.667.
24.

The z-transform of the sequence defined by x(n) = u(n) – (0.5)ⁿ * u(n):
- A.
  
  z/(z-1)
- B.
  
  Z/(z-0.5)
- C.
  
  [z/(z-1) ] - [z/(z-0.5)]
- D.
  
  U (Z) – (0.5)n U (Z)
25.

1000 KHz carrier is modulated by 300 Hz audio sine wave. What will be the frequency present in the output?
- A.
  
  1000.3 KHz, 999.7 KHz
- B.
  
  2000.3 KHz, 999.3 KHz
- C.
  
  1500.3 KHz, 959.7 KHz
- D.
  
  1000.3 KHz, 987.5 KHz

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