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Q1. | A Wien bridge is suitable for |

A. | audio frequencies only [Correct Answer] |

B. | radio frequencies only [Wrong Answer] |

C. | both audio and radio frequencies [Wrong Answer] |

D. | very low frequencies only [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 :**

⇒ A lossless 50 Ω transmission line is terminated 30 +

*j*25 Ω, then voltage reflection coefficient and current reflection coefficient are

062 ∠82.88, - 0.62 ∠82.88

10.36 ∠11.296, - 10.36 ∠111.296

0.23 ∠49.1, - 0.23 ∠ + 49.1

- 10.36 ∠111.296, 10.36 ∠111.296

⇒ The characteristic equation of flip-flop gives the next state Q

_{N + 1}in terms of present state Q

_{N}and the inputs. Which one of the following is the characteristic equation of J - K flip-flop?

Q

_{N+1}= JQ

_{N}+ KQ

_{N}

Q

_{N+1}= J + KQ

_{N}

Q

_{N+1}= KQ

_{N}+ JQ

_{N}

Q

_{N+1}= K + JQ

_{N}

⇒ FET can used in

buffer amplifier circuits

cascade amplifier circuits

digital circuits

all of the above

⇒ Which of the following statement is

*incorrect*?

Curl of vector potential is magnetic field density

Electric charges in motion produce magnetic field

Electric charges at rest produce electrostatic field

None of the above

⇒ The units for intrinsic strength of dielectric are

kV

kV/m

A

A/m

⇒ An ac network has a power factor of 0.8 leading if the applied wave is of fundamental frequency. If the applied wave contains third and fifth harmonics, the overall power factor will be

0.8 leading

less than 0.8 leading

more than 0.8 leading

0.8 leading or more

⇒ A single phase full bridge inverter for R-L loads needs

4 thyristors

4 thyristors and 4 diodes

4 thyristors and 2 diodes

8 thyristors

⇒ An RLC series circuit has R = 8 Ω, X

_{L}= 8 Ω and X

_{C}= 8 Ω Its impedance is

8 +

*j*16 Ω

8 +

*j*8 Ω

8 Ω

24 Ω

⇒ A Hall effect transducer has K

_{H}= - 1 x 10

^{-8}. If B = 1 Wb/m

^{2}, I = 3 A and bismuth slab is 2 mm wide, the Hall voltage is

-7.5 x 10

^{-6}V

-15 x 10

^{-6}

-20 x 10

^{-4}V

-22.5 x 10

^{-4}V

⇒ Consider a baseband binary PAM receiver shown below. The additive channel noise

*n*(

*t*) is whit with power spectral density S

_{N}(

*f*) = N

_{0}/2 = 10

^{-20}W/Hz. The low-pass filter is ideal with unity gain and cutoff frequency 1 MHz. Let Y

_{k}represent the random variable

*y*(

*t*

10

1.414 x 10

2 x 10

_{k}10^{10}10

^{7}1.414 x 10

^{-10}2 x 10

^{-20}

⇒ All network theorems of dc are applicable to ac also with different quantities taken as phasors.

TRUE

FALSE

⇒ If 1 kVA transformer is used for all of the following rectifiers, the d.c. power availability will be least in case of

half wave rectifier

full wave rectifier

bridge rectifier

three phase full wave rectifier

⇒ In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to

50% of peak reverse current

25% of peak reverse current

10% of peak reverse current

zero value

⇒ A broadside array is shown in figure in which the elements are placed at equal distances. The direction of maximum radiation is represented

AA

BB

CC

DD

⇒ An antenna having a high Q has

lower BW

higher BW

flat response

none of the above

⇒ Long distance short-wave radio broadcasting uses

ground wave

ionospheric wave

direct wave

any of the above

⇒ As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?

High gain and better sensitivity

Better selectivity at high frequencies

Stability

Noise suppression

⇒ For an op-amp source follower circuit

input and output voltages have same magnitude

output and input voltages are in phase

output and input voltages are in phase but have different magnitudes

output and input voltages have same magnitude and are in phase

⇒ In a discharging R-L circuit voltage across the resistor exhibits

a linear rise

a linear decay

an exponential growth function

an exponential decay function

⇒

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

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

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

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

⇒ A network N is dual of network N if

both of them have same mesh equation

both of them have same node equation

mesh equation of one are the node equations of the other

KCL and KVL equations are the same

⇒ Negative feedback lowers the cut off frequency and increase the upper cut off frequency of amplifier.

TRUE

FALSE

⇒ In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if

radius as well as operating wavelength are halved

radius as well as operating wavelength are doubled

radius is halved and operating wavelength is doubled

radius is doubled and operating wavelength is halved

⇒ The filter in figure, uses ideal op-amp. I

low pass filter

high pass filter

band pass filter

band stop filter

⇒ Evaluate the value of 2 [

0

4

∞

1

⇒

⇒ All network theorems of dc are applicable to ac also with different quantities taken as phasors.

TRUE

FALSE

⇒ If 1 kVA transformer is used for all of the following rectifiers, the d.c. power availability will be least in case of

half wave rectifier

full wave rectifier

bridge rectifier

three phase full wave rectifier

⇒ In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to

50% of peak reverse current

25% of peak reverse current

10% of peak reverse current

zero value

⇒ A broadside array is shown in figure in which the elements are placed at equal distances. The direction of maximum radiation is represented

AA

BB

CC

DD

⇒ An antenna having a high Q has

lower BW

higher BW

flat response

none of the above

⇒ Long distance short-wave radio broadcasting uses

ground wave

ionospheric wave

direct wave

any of the above

⇒ As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?

High gain and better sensitivity

Better selectivity at high frequencies

Stability

Noise suppression

⇒ For an op-amp source follower circuit

input and output voltages have same magnitude

output and input voltages are in phase

output and input voltages are in phase but have different magnitudes

output and input voltages have same magnitude and are in phase

⇒ In a discharging R-L circuit voltage across the resistor exhibits

a linear rise

a linear decay

an exponential growth function

an exponential decay function

⇒

Match the following:

List I (Operation in Basic) | List II (Priority) | ||
---|---|---|---|

A. | Exponentiation | 1. | 1 |

B. | Multiplication and division | 2. | 2 |

C. | Addition and subtraction | 3. | 3 |

D. | Expression within parenthesis | 4. | 4 |

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

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

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

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

⇒ A network N is dual of network N if

both of them have same mesh equation

both of them have same node equation

mesh equation of one are the node equations of the other

KCL and KVL equations are the same

⇒ Negative feedback lowers the cut off frequency and increase the upper cut off frequency of amplifier.

TRUE

FALSE

⇒ In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if

radius as well as operating wavelength are halved

radius as well as operating wavelength are doubled

radius is halved and operating wavelength is doubled

radius is doubled and operating wavelength is halved

⇒ The filter in figure, uses ideal op-amp. I

low pass filter

high pass filter

band pass filter

band stop filter

⇒ Evaluate the value of 2 [

*u*(*t*- 1) -*u*(1 - 2*t*)] (*u*(*t*+ 1) +*u*(*t*)) at*t*= 3 sec.0

4

∞

1

⇒

**Statement 1**

Statement 1 is true but statement 2 is false

Statement 1 is false but statement 2 is true

Both the statements are true

Both the statements are falseStatement 1 is true but statement 2 is false

Statement 1 is false but statement 2 is true

Both the statements are true

Both the statements are false

⇒ In following figure find V

4 V

- 6 V

- 10 V

6 V

⇒

A-1, B-5, C-4

A-3, B-2, C-4

A-2, B-5, C-4

A-4, B-1, C-3

⇒ If

0.5

0.5

0.5

0.5

⇒ Figure shows the V-

copper

carbon

zinc oxide

rubber

⇒ In following figure find V

_{DSQ}by assuming gate current is negligible for the*p*-channel JFET. (if I_{DQ}= - 6 mA, R_{S}= 0, V_{DD}= -18 V, R_{D}= 2 kΩ, I_{DSS}= - 10 mA, I_{PO}= - 3 V)4 V

- 6 V

- 10 V

6 V

⇒

Match the following:

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

A. | Very low response at very high frequencies | 1. | Low-pass system |

B. | Over shoot | 2. | Velocity damping |

C. | Synchro-control transformer output | 3. | Natural frequency |

4. | Phase-sensitive modulation | ||

5. | Damping ratio |

A-1, B-5, C-4

A-3, B-2, C-4

A-2, B-5, C-4

A-4, B-1, C-3

⇒ If

*q*is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is0.5

*q*ωR0.5

*q*^{2}ω^{2}R^{2}0.5

*q*ωR^{2}0.5

*q*ω^{2}R⇒ Figure shows the V-

*i*characteristics of a material. The material is likely tcopper

carbon

zinc oxide

rubber