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Q1. | BFO stands for |

A. | Beat Frequency Oscillator [Correct Answer] |

B. | Broad Frequency Oscillator [Wrong Answer] |

C. | Blocking Frequency Oscillator [Wrong Answer] |

D. | Ballistic 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 :**

⇒ In 8085 microprocessor, what is the length of temporary register?

6 bits

8 bits

12 bits

16 bits

⇒ The characteristic impedance of coaxial cable is about

1000 ohm

500 ohm

250 ohm

75 ohm

⇒ The

*Z*transform of a particular signal is given

non causal and stable

causal and stable

unstable and noncausal

can't say

⇒ Refer to the NAND and NOR latches shown in the figure. The inputs (P

_{1}, P

_{2}) for both the latches are first made (0, 1) and then, after a few seconds, made (1, 1). The corresponding stable outputs (Q

_{1}, Q

_{2})

NAND: first (0, 1) then (0, 1) NOR: first (1, 0) then (0, 0)

NAND: first (1, 0) then (1, 0) NOR: first (1, 0) then (1, 0)

NAND: first (1, 0) then (1, 0) NOR: first (1, 0) then (0, 0)

NAND: first (1, 0) then (1, 1) NOR: first (0, 1) then (0, 1)

⇒ An antenna having an effective temperature of 27°K is fed into a microwave amplifier that has an effective noise temperature of 30 K. Calculate the available noise power per unit bandwidth

30 K

57 K

27 K

3K, K is Boltzmann constant

⇒ The signal m(

*t*) = 10 cos 100 p

*t*is sampled at the rate of F

_{s}= 75 H

_{z, }then determine signal after sampling.

4 cos 100 p

*t*+ 8 sin 200 p

*t*

4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 75 p

*t*

4 cos 25 p

*t*+ 8 sin 50 p

*t*+ cos 75 p

*t*

none

⇒ A Wien bridge oscillator uses Wien bridge for

tuning and phase shift

tuning

phase shift

either tuning or phase shift

⇒ In

`ALU 1C 74181`

the addition and subtraction is in2's complement

1's complement

binary

none of the above

⇒ Fermi level in intrinsic semiconductor is at the centre of forbidden energy band.

TRUE

FALSE

⇒ The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z

4 bit adder giving P + Q

4 bit subtractor giving P - Q

4 bit subtractor giving Q - P

4 bit adder giving P + Q + R

⇒ The approximate value of input impedance of CE amplifier with emitter resistance R

_{E}is given by

*h*

_{ie}+ A

_{i}R

_{E}

*h*

_{ie}+ (1 +

*h*

_{fe}) R

_{E}

*h*

_{ie}

(1 +

*h*

_{fe}) R

_{E}

⇒ If the mantissa has a sign bit of 0 and the exponent is changed from a negative number to a more positive number the result is

a positive number and closer to zero

a positive number and away from zero

a negative number

a negative number and closer to zero

⇒ The Z parameters Z

_{11}and Z

_{21}for the 2-port network in the fig

Z

_{11}= - 6/

_{11}Ω; Z

_{21}= 16/

_{11}Ω

Z

_{11}= 6/

_{11}Ω; Z

_{21}= 4/

_{11}Ω

Z

_{11}= 6/

_{11}Ω; Z

_{21}= - 16/

_{11}Ω

Z

_{11}= 4/

_{11}Ω; Z

_{21}= 4/

_{11}Ω

⇒ In a transistor push pull amplifier

there is no dc present in the output

there are no even harmonics in the output

both (a) and (b)

neither (a) nor (b)

⇒ The op amp is used in

A/D converters

D/A converters

both (a) and (b)

shift registers

⇒ Good frequency stability can be available

crystal oscillators

Hartley oscillators

colpitts oscillators

none of the above

⇒ Which of the transistor models is most preferred for the analysis of a transistor circuit both at mid-band and at high frequencies?

h-parameter model

y-parameter model

s-parameter model

hybrid-p model

⇒ In a common emitter circuit all voltages are measured with respect to

base

emitter

collector

base or collector

⇒ In the circuit of figure, the load current when thyristor is

is constant

increases exponentially

decreases exponentially

zero

⇒ Consider the following statements about Yagi Uda antenna

- It is unidirectional
- Its gain is about 7 dB
- It is used at VLF
- The optimum separation is 0.11

1 and 2 only

1, 2, 4 only

1, 2, 3, 4

1 and 4 only

⇒ Absolute instruments are used in

laboratories

industries

power houses

standard laboratories

⇒ The simplified logic expression for the circuit of the given figur

Y = A

Y = AB

Y = A + B

Y + A + B

⇒ VF glows with __________ colour when activated.

Red

Orange

Bluish green

none of these

⇒ Consider the following statements about a magic tee

- The collinear arms are isolated from each other.
- On of the collinear arms is isolated from E arm.
- On of the collinear arms is isolated from H arm.
- E and H arms are isolated from each other.

1 and 2 are correct

1 and 3 are correct

1 and 4 are correct

2 and 3 are correct

⇒ N circles for a = a

_{1}, and a = a

_{1}± 180°

*n*(where

*n*= 1, 2, 3, ....) are the same.

TRUE

FALSE

⇒ Following figure repres

AND

OR

NAND

NOT

⇒ A higher directivity is specified by

high gain low BW (Beamwidth)

high gain high BW

low gain high BW

none of the above

⇒ For FM, which of the following statement is not true?

The bandwidth increases as modulation index is increased

The total power remains constant with respect to modulation index

The carrier never becomes zero

All of the above

⇒

Match the following:

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

A. | Digital counter | 1. | Measurement of harmonics |

B. | Schering Bridge | 2. | Measurement of frequency |

C. | Meggar | 3. | Measurement of loss angle of dielectric |

D. | Spectrum analyser | 4. | Measurement of insulation resistance |

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

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

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

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

⇒ In an amplifier the stray capacitances assume impedance at low frequencies

TRUE

FALSE