Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | Wienbridge oscillator uses |

A. | -ve feedback [Wrong Answer] |

B. | +ve feedback [Wrong Answer] |

C. | both +ve, -ve feedback [Correct Answer] |

D. | feedback is not required [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 :**

⇒

Match the following:

List I (Functional components) | List II (Device) | ||
---|---|---|---|

A. | Error detector | 1. | Three phase FHP Induction motor |

B. | Servo motor | 2. | Synchro transmitter and control transformer |

C. | Amplifier | 3. | Tacho generator |

D. | Feed back | 4. | Armature controlled FHP dc motor |

5. | Amplidyne |

A-2, B-4, C-1, D-5

A-4, B-2, C-5, D-3

A-2, B-4, C-5, D-3

A-1, B-2, C-3, D-5

⇒ Which of the following impedance inversion is obtained?

Short-circuited stub

A quarter wave line

Balun transformer

A half wave line

⇒ For a full rectified sine wave, the form factor and peak factor respectively are

1.57 and 2

1.57 and 2

1.11 and 1.11

1.11 and 2

⇒ Dynamic range of hi-fi system is at least

150 dB

120 dB

80 dB

40 dB

⇒ 1274

_{16}- 3A7

_{16}= __________ .

ACA

_{16}

ACB

_{16}

ECD

_{16}

AAA

_{16}

⇒ A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10

*n*F capacitor in the second branch. At resonance frequency, the dynamic resistance is

1 Ω

10 Ω

100 Ω

more than 100 Ω

⇒ A 4 bit down counter can count from

0000 to 1111

1111 to 0000

000 to 111

111 to 000

⇒ To prevent a DC return between source and load, it is necessary to use

resistor between source and load

inductor between source and load

capacitor between source and load

either (a) or (b)

⇒ Since noise phase modulated FM wave, as the noise sideband frequency approaches the carrier frequency, the noise amplitude

is equalized

is increased

is decreased

remains constant

⇒ Two rectangular waveforms of duration t

_{1}and t

_{2}seconds are convolved. What is the shape of the resulting waveform?

Triangular

Rectangular

Trapezoidal

Semi-circular

⇒

Match the following:

List I (F.T and F.S) | List II (Properties) | ||
---|---|---|---|

A. | Fourier Series | 1. | Discrete, Periodic |

B. | Fourier Transform | 2. | Continuous, Periodic |

C. | Discrete Time Fourier | 3. | Discrete aperiodic |

D. | Discrete Fourier Transform | 4. | Continuous, aperiodic |

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

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

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

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

⇒ For a Gaussian process, auto-correlation also implies

statistical dependence

statistical independence

ergodic process

none of the above

⇒ For a second order system ω

_{n}is natural frequency, ω

*is frequency of damped oscillations and ζ is damping factor. Then*

_{d}ω

_{d}= ω

_{n}ξ

ω

_{d}= ω

_{n}(1 - ξ)

^{2}

ω

_{d}= ω

_{n}(1 - ξ)

^{0.5}

ω

_{d}= ω

_{n}(1 - ξ

^{2})

^{0.5}

⇒ If

*e*= 10 sin(10

^{8}

*t*+ 3 sin 10

^{4}

*t*) then the modulation index is

1

2

3

4

⇒ The purpose of earthing electric appliances is

to provide safety against shock

to ensure that appliance works satisfactorily

to ensure that appliance gets full voltage

all of the above

⇒ A heavily doped semiconductor exhibits a __________ such a device is called sensistors.

negative temperature coefficient of resistance

positive temperature coefficient of resistance till a particular value of temperature and then it shown negative temperature coefficient of resistance

positive temperature coefficient of resistance

none of the above

⇒ The PCM signal shown below uses amplitude level of +1 volt and -1 volt to represent binary symbol 0 and 1 respectively. Each code word consists of 4 bits. The sampled version of analog signal from which this PCM signal is derived

EB596

CD231

DA495

25B6A

⇒ The output of a Piezoelectric crystal has

low amplitude and low impedance

high amplitude and low impedance

low amplitude and high impedance

high amplitude and high impedance

⇒ In the given figure

*f*(

*t*) is an even funct

TRUE

FALSE

⇒ Ridge waveguide is essentially a form of capacitively loaded guide.

TRUE

FALSE

⇒ In major diatonic musical scale, an octave is divided into

12 intervals

10 intervals

7 intervals

5 intervals

⇒ In a 7 segment display the segments

*a, c, d, f, g*are lit. The decimal number displayed will be

9

5

4

2

⇒ Which of following antenna does not depend upon the frequency?

Log-periodic

Parabolic

Conical

All of the above

⇒

**Assertion (A):** Integral control action is sometimes called reset control.

**Reason (R):** Reset rate is expressed as number of repeats per unit time.

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

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

A is correct but R is wrong

R is correct but A is wrong

⇒ For a photo conductor with equal electron and hole mobilities and perfect ohmic contacts at the ends, an increase in the intensities of optical illumination results in

change in open circuit voltage

change in short circuit current

a reduction resistance

an increase of resistance

⇒ Barkhausen criterion is 1 + A

_{v}β = 0.

TRUE

FALSE

⇒ When a ferromagnetic substance is magnetised there are small changes in dimensions. This phenomenon is called

hysteresis

magnetostriction

diamagnetism

dipolar relaxation

⇒ In the circuit of fi

V

_{a}would always lag V

_{b}

V

_{a}would always lead V

_{b}

V

_{a}and V

_{b}would always be in phase

V

_{a}may lag or lead V

_{b}

⇒ A sine wave with slew rate distortion looks like

step wave

square wave

triangular wave

cosine wave

⇒ At 0 K the forbidden energy gap in intrinsic semi conductor is about

10 eV

6 eV

1 eV

0.2 eV