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Q1. | In a backward wave oscillator the wave travelling along the line winds itself back and forth |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ Three impedances (3 +

*j*4) Ω each are connected in star. The impedances of equivalent delta circuit will be

3 -

*j*4 Ω each

9 +

*j*12 Ω each

9 -

*j*12 Ω each

3 +

*j*4, 3 -

*j*4 and 4 -

*j*3 Ω

⇒

**Assertion (A):** A thermocouple transducer is based on Seeback effect.

**Reason (R):** In a thermocouple transducer used for temperature measurement, the cold junction is usually kept in ice bath.

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

⇒ In gases the flow of current is due to

positive ions only

electrons only

electrons, positive ions and negative ions

electrons and positive ions

⇒ The counter which require maximum number of FF for a given mod counter is

Ripple counter

BCD counter

Ring counter

Programmed counter

⇒ A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

16

15

8

1

⇒ Lower chip area requirements of MOS is advantage in

low power circuits

high power circuits

repetitive operation circuits

large scale integration

⇒ The temperature coefficient of resistivity of semiconductors is

positive

negative

may be positive or negative

very low

⇒ The impedance inversion may be objected with

a short-circuited stub

an open-circuited stub

a half-wave line

a quarter-wave line

⇒

*e*

^{-3}

*is a*

^{t}energy signal

power signal

Both (a) and (b)

none

⇒ The effective refraction index of the ionosphere for radio wave is

more than unity

less than unity

equal to unity

either more or less than unity depending on the electron concentration

⇒ In brushless excitation system of modern alternators, the main exciter is

dc generator

ac generator

either dc or ac generator

induction generator

⇒ For most metals, Fermi level E

_{F}is less than

0.1 eV

2 eV

5 eV

10 eV

⇒ What is the frequency of the modulated carrier wave?

1000 Hz

2000 Hz

1000 kHz

2000 kHz

⇒ Laplace transform of unit doublet is

1/

*s*

*s*

^{2}

*s*

none

⇒ Radio broadcasts are generally

amplitude modulation

frequency modulation

both amplitude and frequency modulation

neither amplitude nor frequency modulation

⇒ It

*f*(

*t*) is an odd function, the coefficients F

*in the exponential form of Fourier series*

_{n}are real

are imaginary

are complex

may be real or imaginary

⇒ The circuit in figur

positive clamper

negative clamper

positive peak clipper

negative peak clipper

⇒ If a

_{ac}for transistor is 0.98 then β

_{ac}is equal to

51

49

47

45

⇒ The main disadvantage of a JFET is

low gain-bandwidth product

high noise level

high cost

low gain

⇒ If an inductance L is connected in one arm of bridge and resistance R

_{1}, R

_{2}, R

_{3}in other three arms

the bridge cannot be balanced

the bridge can be balanced

the bridge is balanced for some specified value of frequency

the bridge is balanced for some specific values of R

_{1}, R

_{2}, R

_{3}

⇒ In the human eye, an image persists for a time of about

1 second

0.1 second

0.05 second

0.02 second

⇒ For a BJT, under the saturation region.

I

_{C}= βI

_{B}

I

_{C}> βI

_{B}

I

_{C}is independent of other parameter

I

_{C}< βI

_{B}

⇒ If

*f*(

*t*) ↔ F(

*j*ω),

*f*(-

*t*) ↔

- F(

*j*ω)

F(-

*j*ω)

F(

*j*ω)

0.5 F(

*j*ω)

⇒

**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 false

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 false

⇒ Thermal noise has a power spectral density which is quite uniform upto frequencies in the order of

100 Hz

10

10

10

⇒ If 137 + 276 = 435 how much is 731 + 672?

534

1403

1623

1513

⇒ For a low level AM system, the amplifiers modulated stage must be

linear devices

harmonic devices

class C amplifiers

non-linear devices

⇒ An ideal Op-amp is an ideal

voltage controlled current source

voltage controlled voltage source

current controlled current source

current controlled voltage source

⇒ In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be

0.5 T

less than 0.5 T

more than 0.5 T

0.5 T or more or less

⇒ In TE

there is one half sine wave variation along

there is one half sine wave variation along

there is one full sine wave variation along

none of the above

⇒ Thermal noise has a power spectral density which is quite uniform upto frequencies in the order of

100 Hz

10

^{6}Hz10

^{9}Hz10

^{13}Hz⇒ If 137 + 276 = 435 how much is 731 + 672?

534

1403

1623

1513

⇒ For a low level AM system, the amplifiers modulated stage must be

linear devices

harmonic devices

class C amplifiers

non-linear devices

⇒ An ideal Op-amp is an ideal

voltage controlled current source

voltage controlled voltage source

current controlled current source

current controlled voltage source

⇒ In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be

0.5 T

less than 0.5 T

more than 0.5 T

0.5 T or more or less

⇒ In TE

_{10}mode of rectangular waveguidethere is one half sine wave variation along

*x*direction and one along*y*directionthere is one half sine wave variation along

*y*direction and one along*x*directionthere is one full sine wave variation along

*x*direction and one along*y*directionnone of the above