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Q1. | An oscillator requires an amplifier |

A. | with negative feedback [Wrong Answer] |

B. | with positive feedback [Correct Answer] |

C. | with either positive or negative feedback [Wrong Answer] |

D. | none of the above [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 microwave system, waveguide twists

change the plane of polarization of a propagating wave

change the direction of a propagating wave

change the mode of a propagating wave

both (b) and (c)

⇒ In figure the voltage drop across the 10 Ω resistance is 10 V. The resistan

is 6 Ω

is 8 Ω

is 4 Ω

cannot be found

⇒ Directive gain of elementary doublet is

100

10

1.5

0.5

⇒ The ac input voltage of an amplifier

is always equal to ac signal voltage

may be equal to or more than ac signal voltage

is always less than ac signal voltage

may be equal or more or less than ac signal voltage

⇒ A voltage V(

*t*) is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt

^{2}. If it is measured by a dc meter. The reading will be

0

4

2

2

⇒ Which of the following material has nearly zero temperature-coefficient of resistance?

Carbon

Porcelain

Copper

Manganin

⇒ The number of operator to accomplish basic arithmetic in Java is

4

5

6

7

⇒ For use at 50 Hz the range of scale of vibrating reed frequency meter is

25 - 75 Hz

40 - 60 Hz

47 - 53 Hz

42 - 58 Hz

⇒

**Assertion (A):** A tree of graph contains all the nodes of the graph.

**Reason (R):** The number of links is always less than the number of tree branches.

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

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

A is true but R is false

A is false but R is true

⇒ The A.C. resistance of the emitter diode will be

5.05 Ω

50.5 Ω

505 Ω

5050 Ω

⇒ For a transistor to have-a larger β it must have and a

close to zero

close to 0.5

close to unity

nearly infinite

⇒ Consider the following statements, SWR of a transmission line is infinite when the load is

- a short circuit
- a complex impedance
- an open circuit
- a pure reactance

1 and 3 only

1, 2, 3

2, 3, 4

1, 2, 4

⇒ Transport lag usually exists in

thermal systems

hydraulic systems and thermal systems

pneumatic systems

thermal, hydraulic and pneumatic systems

⇒ Which one of the following is true?

Alternating voltage and current contain odd and even harmonics

The inductance in a circuit reduces the effect of harmonics and makes current wave more sinusoidal than voltage wave

Alternating voltage and current waveforms, in general, do not contain odd harmonics

Inductance of a circuit does not alter wave shape at all

⇒ Which of the following produces very wide drifts in clock frequency?

Crystal

RC circuit

LC resonant circuit

Crystal and RC circuit

⇒

Match the following:

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

A. | Copper | 1. | produces discrete energy level just above valence band |

B. | Rubber | 2. | produces discrete energy level just below conduction band |

C. | Antimony | 3. | large forbidden gap |

D. | Boron | 4. | valence and conduction bands overlap |

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

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

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

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

⇒ Which of the following does not characterize a ferromagnetic material?

Coercivity

Permeability

Permittivity

Reluctance

⇒ In Java it is possible to have

- An array of integers
- An array of string objects
- An array of arrays
- An array on integer and strings

All

1, 2 and 3 only

1 and 2 only

1, 3 and 4 only

⇒ A voltage

*v*= 100 sin ω

*t*+ 10 sin 5 ω

*t*is applied to a pure capacitor having capacitance of 1 μF. If ω = 314 rad/sec, the current through the capacitor is

0.0314 cos 314

*t*+ 0.0157 cos 1570

*t*

0.0314 sin 314

*t*+ 0.0157 sin 1570

*t*

0.0314 cos 314

*t*+ 0.0314 cos 1570

*t*

0.0157 cos 314

*t*+ 0.0157 cos 1570

*t*

⇒ In drawing phasor diagram

rms values are used

peak values are used

either rms or peak values are used

either rms or peak or averages values are used

⇒ DeMorgan's first theorem is =

A . A = 0

A = A

A + B = A . B

AB = A + B

⇒ Status register in the 8156 is read with

IN 20 H

OUT 20 H

either (a) or (b)

none of the above

⇒ A lossless transmission line with air dielectric is 6 m long. What is the line length at 30 MHz?

1 wavelength long

0.5 wavelength long

0.6 wavelength long

0.25 wavelength long

⇒ In direct addressing mode of 8085

All instructions are 3 bytes long

All instructions are 3 bytes long except IN instruction which is 2 bytes long

All instructions are 3 bytes long except IN and OUT instructions which are 2 bytes long

All instructions are 2 bytes long

⇒

**Assertion (A):** A graph is planar if it has a dual.

**Reason (R):** The dual of a graph can be found by window dot method.

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

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

A is true but R is false

A is false but R is true

⇒ Which of the following is basically a voltage controlled capacitance?

Zener diode

Diode

Varactor diode

LED

⇒ The Fourier series representation of a periodic current (2 + 62 cos ω

*t*+48 sin 2ω

*t*) A. The effective value is

(2 + 6 + 24) A

0.333333333333333

0.25

0.0833333333333333

⇒ The purpose of impedance matching in an amplifier circuit is to achieve

high efficiency

reduce distortion

maximum power transfer

none of the above

⇒ The terminals of a power BJT are called

emitter, base, collector

emitter, base, drain

source, base, drain

source, base, collector

⇒ Shift left and shift right operations occur in a calculator.

TRUE

FALSE