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Q1. | Which of the following circuit cannot be used to demodulate SSB? |

A. | Phase discriminator [Correct Answer] |

B. | Produce detector [Wrong Answer] |

C. | Balanced modulator [Wrong Answer] |

D. | Beat frequency oscillator [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Intrinsic concentration of charge carriers in a semiconductor varies as

T

T

^{2}

T

^{3}

T

^{-2}

⇒ Which of the following instructions in 8085 does not belong to data transfer group?

`L X I `*rp*, data 16

`MOV M, `*r*

`MVIM, data`

`ADC M`

⇒ A 10 bit ADC with a full scale output voltage of 10.24 V is to be designed to have ± LSB/2 accuracy. If ADC is calibrated at 25°C, the maximum net temperature coefficient of ADC should not exceed

± 200 μV/°C

± 400 μV/°C

± 600 μV/°C

± 800 μV/°C

⇒ Calculate the critical frequency for the E layer if maximum ionic densities are 3 x 10

^{6}

15.58 x 10

^{6}

15.58 kHz

1.58 x 10

^{3}

None of the above

⇒ A memoryless source emits

*n*symbols each with a probability

*p*. The entropy of the source as a function of

*n*

increases as log

*n*

decreases as log (1/

*n*)

increases as

*n*

increases as

*n*log

*n*

⇒ The operating modes of 8255 A are called

mode 0 and mode 1

mode 0, mode 1 and mode 2

mode 0 and mode 2

mode 0, mode 2 and mode 3

⇒ An ac voltage 20 sin 1000

*t*feeds an R-C series circuit. R = 8 Ω and active power is 4 W. The power factor is

1

0.8

0.6

0.4

⇒ For the logic circuit of the given figure the simplified Boolean expressio

Y = AB + A C

Y = (AB) (A C)

Y = ABC

Y = A B + A C

⇒

Match the following:

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

A. | PMMC | 1. | Square law type scale |

B. | Moving iron | 2. | Very good response |

C. | Thermo-couple | 3. | Linear scale |

D. | Electrostatic | 4. | Voltmeter |

A-4, B-1, C-2, D-3

A-3, B-2, C-1, D-4

A-4, B-2, C-1, D-3

A-3, B-1, C-2, D-4

⇒ When thyristors are connected in series and parallel, it may be necessary to have :

current derating

voltage derating

both current and voltage derating

none of the above

⇒ The temperature coefficient of resistance for a thermistor is

low and negative

low and positive

high and negative

high and positive

⇒ The function Y = AC + BD + EF is

POS

SOP

Hybrid

none of the above

⇒ Wire-wound resistors are unsuitable for use at high frequencies because they

are likely to melt under excessive eddy current heat

exhibit unwanted inductive and capacitive effects

create more electrical noise

consume more power

⇒ The low pass filter characteristic shown in figure realiza

TRUE

FALSE

⇒ The voltage across the secondary of the transformer in a half wave rectifier (without any filter circuit) is 25 volts. The maximum voltage on the reverse biased diode will be

100 V

50 V

25 V

12.5 V

⇒ The circuit of figure is generally employed

bridge

low-pass filter

peaking network

high-pass filter

⇒ The device 'one shot' has

two stable states

one stable state

either 1 or 2 stable states

no stable state

⇒ Consider the following statements:

- If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.
- If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.
- If one or more non-repeated roots of characteristic equation are on
*j*ω axis impulse response is bounded but the system is unstable.

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

⇒ For the logic circuit shown in figure, the simplified Boolean expression for the output

A + B + C

AB

B

C

⇒ If a line is terminated in characteristic impedance Z

_{0}, the input impedance measured at the input will be

Z

_{0}

Z

_{0}/2

Zero

infinite

⇒ Leak type bias is used in plate modulated class C amplifier to

increase the bandwidth

prevent over modulation

prevent excessive grid current

prevent tuned circuit damping

⇒ A potential of 7 V is applied to a silicon diode. A resistance of 1 K ohm is also in series with the diode. The current is

7 mA

6.3 mA

0.7 mA

0

⇒ Consider the following statements:

- Strictly speaking C supports 1-dimensional arrays only.
- An array element may be an array by itself.
- Array elements need not occupy contiguous memory locations.

1 only

2 only

1 and 2

2 and 3

⇒ When a current source I is suddenly connected across a two terminal relaxed RC circuit at time

*t*= 0, the voltage across the current source is shown in figure. The RC circui

a series combination of R and C

a parallel combination of R and C

a series combination of R and parallel combination of R and C

a pure capacitor

⇒ BCD numbers are useful whenever

binary to hexadecimal conversion is desired

binary to BCD conversion is desired

decimal information is transferred into or out of a digital system

none of the above

⇒

**Assertion (A):** Thevenin's theorem helps us to find current in a branch of a network for different values of impedances of that branch.

**Reason (R):** Thevenin's equivalent circuit replaces a network by a voltage source in series with impedance.

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

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ If

*f*

_{1}(

*t*)<<

*F*(

_{1}*j*ω) and

*f*

_{2}(

*t*)↔ F

_{2}(

*j*ω), then [

*a*

_{1}

*f*

_{1}(

*t*) + a

_{2}

*f*

_{2}(

*t*)]↔

*a*

_{1}F

_{1}(

*j*ω) +

*a*

_{2}F

_{2}(

*j*ω)

*a*

_{1}

*a*

_{2}F

_{1}(

*j*ω) + F

_{2}(

*j*ω)

*a*

_{1}F

_{1}(

*j*ω) -

*a*

_{2}F

_{2}(

*j*ω)

*a*

_{1}F

_{1}*(

*j*ω) +

*a*

_{2}F

_{2}*(

*j*ω)

⇒ Consider the Boolean expression X = ABCD + ABCD + ABCD + ACBD The simplified form of X is

C + D

BC

CD

B

⇒ The input and output signals for CE amplifier are always

equal

in phase

out of phase

complementary to each other

⇒ To multiply a number by 8 in 8085 we have to use

`RAL`

instructiononce

twice

thrice

four times