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Q1. | Which of the following is the main advantage of PCM system? |

A. | Lower noise [Correct Answer] |

B. | Lower power [Wrong Answer] |

C. | Lower bandwidth [Wrong Answer] |

D. | All of the above [Wrong Answer] |

View Answer
Explanation:-
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**Also Read Similar Questions Below :**

⇒ Equation

*x*

_{l0}= 11001001

_{2}when solved for

*x*gives the value of

*x*as

8

111

152

201

⇒ A microstrip line has dielectric having relative permittivity ∈

*. The effective dielectric constant is*

_{r}more than ∈

_{r}equal to 1

less than ∈

_{r}either

*a*or

*b*

⇒ Which of the following constitutes an active component?

Semiconductor device

Resistors

Capacitors

Inductors

⇒ TTL uses

multi-emitter transistors

multi-collector transistors

multi-base transistors

multi-emitter or multi-collector transistors

⇒ The basic shift register operations are

serial in - serial out

serial in - parallel out

parallel in - serial out

all of the above

⇒ For a transistor amplifier with self biasing network, the following components are used. R

_{1}= 4 kΩ, R

_{2}= 4 kΩ, R

_{C}= 1 kΩ. The approximate value of the stability factor 'S' will be

4

3

2

1.5

⇒ Algebraic expression for

*z*-transform of

*x*[

*n*] is X[

*z*]... What is the algebraic expression of

*z*-transform of

*e*

^{jω0n}

*x*[

*n*]?

X(Z - Z

_{0})

X(

*e*

^{-jW0z})

X(

*e*

^{jω0z})

X(Z)

^{jω0z}

⇒ Directivity means

maximum directive gain

zero directive gain

minimum directive gain

none of the above

⇒ Following state diagram shows clocked sequential circ

6

7

5

4

⇒ The encapsulation of transistor is necessary for

preventing radio interference

preventing photo-emission effects

avoiding loss of free electrons

mechanical ruggedness

⇒ A tie set schedule shows

incidence of branches to nodes

incidence of branches to loops

incidence of nodes to loops

none of the above

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Flash converter ADC | 1. | requires conversion time of a few μs |

B. | Dual slope ADC | 2. | requires DAC |

C. | Successive approximation ADC | 3. | minimizes the effect of power supply interference |

4. | requires complex hardware | ||

5. | is a tracking ADC |

A-2, B-3, C-4

A-4, B-3, C-2

A-5, B-4, C-3

A-1, B-2, C-5

⇒ As temperature increases the forbidden gap in silicon increases.

TRUE

FALSE

⇒ 50 independent low pass signals of bandwidth W, 2W, 3W, W, 2W, 3W, W, 2W, 3W H

*z*are to be time division multiplexer on a common channel using PAM. To achieve this, the minimum transmission capacity of the channel should be __________ .

1 H

*z*

12 H

*z*

3 H

*z*

6 H

*z*

⇒ Which of the following microphones works on the principle of Faraday's law?

Carbon

Condenser

Moving coil

Electret

⇒ In 8085 microprocessor, how many I/O ports can be accessed by direct method?

8

256

32 K

64 K

⇒

**Assertion (A):** A higher level language is less efficient that machine language but more efficient than assembly language.

**Reason (R):** It is easier to learn and use higher level language than machine language.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct R is wrong

A is wrong R is correct

⇒ For input and later stages, BI-FET op-amp use

JFETs and MOSFETs respectively

MOSFETs and JFETs respectively

JFETs and BJTs respectively

BJTs and JFETs respectively

⇒ In a synchro transmitter-control transformer, the voltage induced in rotor winding of control transformer is zero when the angular displacement between rotors of transmitter and transformer is

0°

90°

180°

either (a) or (c)

⇒ Consider the following statement: In case of a superconductor

- B = 0
- μ
_{r}is high - diamagnetism is high
- transition temperature varies with isotopic mass.

1 and 2 are correct

2, 3, 4 are correct

1, 3, 4 are correct

2, 4 are correct

⇒ The circuit in figure(1) is replaced by that in figure(2). It remains same R

_{0}wil

zero

R

2R

4R

⇒ In a series RLC circuit the dB level of currents at half power frequencies as compared to current at resonance is

3

-3

0.5

-0.5

⇒ A speech signal, band limited to 4kHz and peak voltage varying between + 5V and - 5V is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits. The number of quantization levels required to reduce the quantization noise by a factor of 4 would be

1024

512

256

64

⇒

**Assertion (A):** Negative feedback reduces the bandwidth of an amplifier

**Reason (R):** Negative feedback stabilizes the gain of an amplifier

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ A voltage v = 5 + 50 sin ω

*t*/ + 5 sin 5 &omega

*t*is applied to a pure capacitor of capacitance 1 ωF. If

*f*/= 314 rad/sec, current is

1 + 0.0157 cos 314

*t*+ 0.00785 cos 1570

*t*

0.0157 cos 314

*t*+ 0.00785 cos 1570 t

0.0157 sin 314

*t*+ 0.00785 sin 1570

*t*

0.0157 sin (314

*t*/ + 45°) + 0.00785 sin (1570

*t*+ 45°)

⇒ Bellows converts

pressure difference into displacement

pressure difference into voltage

displacement into pressure difference

either (a) or (c)

⇒ A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at

*s*= - 2 and

*s*= - 4, and one simple zero at

*s*= - 1. A unit step

*u*(

*t*) is applied at the input of the system. At steady state, the output has constant value of 1. The impulse response of this system is

[exp (- 2

*t*) + exp (-4

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*) - exp (-

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*)]

*u*(

*t*)

[-0.5 exp (- 2

*t*) + 1.5 exp (-4

*t*)]

*u*(

*t*)

⇒ Which of the following terms are equivalent?

- A ⊕ B ⊕ C
- A ⊕ B ⊙ C
- A ⊙ B ⊕ C
- A ⊙ B ⊙ C

1 and 4; 2 and 3

1 and 3

2 and 3

1, 2 and 4

⇒ The circuit in figure will act as ideal current source with respect to terminals A and B when frequenc

0

1 rad/sec

4 rad/sec

16 rad/sec

⇒ A sinusoidal voltage of 2 kV peak value is amplitude modulated to give 20% modulation. The peak value of each side band term is

400 V

200 V

100 V

800 V