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Q1. | A buffer is a device that isolates other devices. Typically a buffer has |

A. | a high input impedance and a low output impedance [Correct Answer] |

B. | a high input impedance as well as output impedance [Wrong Answer] |

C. | a low input impedance and a high output impedance [Wrong Answer] |

D. | a low input impedance as well as output impedance [Wrong Answer] |

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

⇒ In figure, V

_{0-1 V2 V+1 V+15 V}

⇒ A material has conductivity of 10

^{5}mho/m and permeability of 4p x 10

^{-7}H/m. The skin depth at 9 GHz is

1.678 μm

26 μm

17 μm

32.32 μm

⇒ An

*m*derived low pass filter has

*f*

_{c}= 1000 Hz,

*f*

_{∞}= 1250 Hz and

*m*= 0.6. If

*m*is increased, then

both

*f*

_{c}and

*f*

_{∞}will increase

both

*f*

_{c}and

*f*

_{∞}will decrease

*f*

_{c}will remain constant but

*f*

_{∞}will decrease

*f*

_{c}will remain constant but

*f*

_{∞}will increase

⇒ Which statement is true for an ac circuit?

Active power is always less than apparent power

Active power cannot be more than apparent power

Active power is always more than reactive power

Active power cannot be more than reactive power

⇒ The directive gain of a transmitting antenna is proportional to

its cross-sectional area

square of cross-sectional area

square root of cross-sectional area

cube root of cross-sectional area

⇒ 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

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⇒ If operator '

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75 Ω

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K

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_{c}Kp

*f*

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⇒ In a reflex klystron oscillator, repeller electrode is at

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high positive potential

negative potential

zero potential

⇒

**Assertion (A):** Electric coupling, magnetic coupling and ground loop can cause unwanted high frequency oscillations.

**Reason (R):** Hartley oscillator uses a tapped inductor

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

⇒ Load Z

_{L}for maximum power transfe

R

R +

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R -

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none

⇒ The effective value of the waveform in the given figur

5

2.5

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5.0

⇒ Trinitron is a monochrome picture tube.

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FALSE

⇒ The common emitter short circuit current gain β of a transistor

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_{c}

⇒ The current source in figure, can be replace

a voltage source of 20 V in series with 5 ohm resistance

a voltage source of 16 V in series with 4 ohm resistance

a voltage source of 20 V in series with 4 Ω resistance

a voltage source of 16 V in series with 5 Ω resistance

⇒ Which of the following impedance inversion is obtained?

Short-circuited stub

A quarter wave line

Balun transformer

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peak value

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*t*= 12 n sec the largest MOD counter that can be constructed from these FF and still operate up to 10 MHz is

_{pd}any

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⇒ Laplace transform method enables us to find the response in

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⇒ Which of these are universal gates?

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Both NOR and NAND

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4 AH, 0

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4 BH, 0

4 BH, 1

⇒ Which of the following is a valid real constant in FORTRAN 77?

1.2 E 231

3 E - 2

-3.2 E 2.3

1.2 E 23

⇒ The phase of colour subcarrier burst in PAL is along the axis at

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cutoff frequency for TE

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cutoff frequency for TE

_{10}mode = twice the cutoff frequency for TE

_{20}mode

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_{10}mode = haf the cutoff frequency for TE

_{20}mode