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Q1. | The voltage gain of an amplifier without and with feedback are 100 and 20. The negative feedback is |

A. | 0.04 [Correct Answer] |

B. | 0.05 [Wrong Answer] |

C. | 0.2 [Wrong Answer] |

D. | 0.8 [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 :**

⇒ The given figure shows three Nyquist plots of G(

*s*) H(

*s*) =

*e*/[

^{-sT}*s*(

*s*+ 1)] for different values of T. The curves 1, 2, 3 ca

for T = 0, 0.5 and 1 respectively

for T = 1, 0.5 and 0 respectively

for T = 0.5, 1 and 0 respectively

for T = 0, 1 and 0.5 respectively

⇒ A conductor is said to be perfect if it has __________ conductivity

finite

infinite

unity

zero

⇒

Match the following:

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

A. | Darlington amplifier | 1. | A circuit using pnp and npn transistors |

B. | CB amplifier | 2. | A CS amplifier driving a CG amplifier |

C. | Cascade amplifier | 3. | A circuit with over-all voltage gain close to 1 and very large input impedance |

D. | Complementary symmetry amplifier | 4. | A circuit with low input impedance |

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

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

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

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

⇒ The equivalent circuit of an op-amp has

a virtual ground at input

a virtual ground at output

virtual ground at input as well as at output

none of the above

⇒ Which of the following terms are applicable to troposcatter propagation?

Faradays rotation

SIOs

Fading

Atmospheric storms

⇒ In a digital system there are three inputs ABC. Output should be high when atleast two inputs are high. Then output =

AB + BC + AC

ABC + ABC + A BC + ABC

AB + BC + AC

AB + BC + AC

⇒ A loss less line of characteristic impedance Z

_{0}is terminated in pure reactance of -

*j*

*Z*

_{0}value. VSWR is

10

2

1

infinity

⇒

Match the following:

List I (Processor in C) | List II (Output) | ||
---|---|---|---|

A. | Preprocessor | 1. | Source code file |

B. | Compiler | 2. | Executable code in machine language |

C. | Linker | 3. | Relocatable object code |

A-1, B-2, C-3

A-2, B-3, C-1

A-3, B-2, C-1

A-1, B-3, C-2

⇒ The instrument used to check insulation of household wiring is

megger

ohmmeter

multimeter

high resistance voltmeter

⇒ Vestigial sideband is most commonly used in

radio transmission

television transmission

telephony

all of the above

⇒ Which of these are universal gates?

Only NOR

Only NAND

Both NOR and NAND

NOR, NAND, OR

⇒

**Assertion (A):** A semiconductor strain gauge is more accurate than a resistance strain gauge.

**Reason (R):** The gauge factor of a semiconductor strain gauge is about 100 where as the gauge factor of a resistance strain gauge is only about 2.

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

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

A is true R is false

A is false R is true

⇒

**Assertion (A):** Resistivity of a perfect single crystal of a metal goes to zero as T approaches zero.

**Reason (R):** Scattering of electrons is due to deviations from perfect periodicity of lattice.

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

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

A is true but R is false

A is false but R is true

⇒ Four sig

2

*f*

_{0}

3

*f*

_{0}

4

*f*

_{0}

8

*f*

_{0}

⇒ Noise with uniform power spectral density of N

_{0}ω/H

_{z}is passed through a filter H(ω) = 2 exp (-J ω

*t*) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in watts is

_{y}2 N

_{0}B

4 N

_{0}B

8 N

_{0}B

16 N

_{0}B

⇒ Many circles are drawn in a Smith chart used for transmission line calculations. The circle shown in the figure represe

unit circles

constant resistance circles

constant reactance circles

constant reflection coefficient circles

⇒ A cut set schedule shows

incidence of branches to loops

incidence of branches to nodes

incidence of nodes to loops

none of the above

⇒ If the ratio of ac to dc load impedance of a diode detector is low, the result will be

poor AGC operation

poor AF response

negative peak clipping

diagonal clipping

⇒ An open coil has

zero resistance and inductance

zero resistance and high inductance

infinite resistance and zero inductance

infinite resistance and normal inductance

⇒ The shot circuit admittance matrix of a two port network is

non-reciprocal and passive

non-reciprocal and active

reciprocal and passive

reciprocal and active

⇒ Choose the correct statement

The reflection coefficient (r) of a transmission line is greater than 1

r varies from 0 to ∞

r is less than or equal to 1

r varies from - ∞ to + ∞

⇒ AC hum is picked up from power cables

TRUE

FALSE

⇒ For the characteristic equation

*s*

^{5}+

*s*

^{4}+ 2

*s*

^{3}+ 2

*s*

^{2}+ 3

*s*+ 15 = 0, the number of roots in left half

*s*plane are

1

2

3

5

⇒ For the network shown below, the Thevenin voltage and R

_{TH}is equal to _______

0 V, 58.82 Ω

0 V, 96.774 Ω

0 V, 3 KΩ

None of these

⇒ A step voltages is applied to RLC series circuit having R = 2 Ω, L = 1 H and C = 1 F. The transient current response will be

over damped

critically damped

under damped

any of the above depending the magnitude of voltage

⇒ Consider the following statements.

- Etching
- Exposure to UV radiation
- Stripping
- Developing

2, 4, 3, 1

2, 4, 1, 3

4, 2, 1, 3

3, 2, 3, 1

⇒ As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes

division by s in the

*s*domain

division by

*e*

^{-sT}in the

*s*domain

multiplication by

*s*in the

*s*domain

multiplication by

*e*

^{-sT}in the

*s*domain

⇒ In Bode analysis the correction at corner frequency is 3 dB.

TRUE

FALSE

⇒ In figure the diode is ideal (zero cut in voltage zero forward resistance). Then the current through diod

0

0.166666666666667

0.0416666666666667

none of the above

⇒ In one's complement 8 bit representation 11111111 represents

0

0

1

-1