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Q1. | Which of the following is a vector quantity? |

A. | Standing wave ratio [Wrong Answer] |

B. | Reflection coefficient [Correct Answer] |

C. | Gain [Wrong Answer] |

D. | All of the above [Wrong Answer] |

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

⇒ Which of the following is/are not a property/properties power spectral density function S

*x*(ω)?

S

*x*(ω) is real function of ω

S

*x*(ω) is a even function of ω

S

*x*(ω) is non-positive function of ωS

*x*(ω) ≤ 0 for all ω

All of the above

⇒ A 6 bit R-2

*R*ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity then resolution in percent and volts.

3% 7 V

6.4 V, 2%

0.1%, 1.57 V

1.57%, 0.1 V

⇒ In a medium if ε, μ and σ are constant throughout the medium, then it is known as

perfect vacuum

distributed medium

homogeneous medium

dielectric medium

⇒ Logic analyser is

a multichannel oscilloscope

similar to logic pulser

similar to current tracer

none of the above

⇒ A DC voltage source is connected across a series R - L - C circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

R only

C only

L only

R and L combination

⇒ If a electromagnetic signal is incident at 0° in a waveguide then at other port of waveguide we will get

zero power

∞ power

depend upon input signal strength

depend on frequency

⇒ Laplace transform of a unit doublet U

_{-2}(

*t*) is

1/

*s*

*s*

0

1

⇒ Mesh analysis is applicable __________ only.

planar network

non planar network

a circuit which contains only current sources

none

⇒ A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is

1.26 x 10

^{6}W

1.26 x 10

^{-2}W

1.26 x 10

^{-8}W

1.26 x 10

^{-16}W

⇒

**Assertion (A):** Silicon is less sensitive to changes in temperature than germanium.

**Reason (R):** It is more difficult to produce minority carriers in silicon than in germanium.

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

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

A is true but R is false

A is false but R is true

⇒ Forbidden energy gap in germanium at 0 K is about

10 eV

5 eV

2 eV

0.78 eV

⇒ Which one is a linear system?

*y*[

*n*] =

*x*[

*n*] x

*x*[

*n*- 1]

*y*[

*n*] =

*x*[

*n*] +

*x*[

*n*- 10]

*y*[

*n*] =

*x*

^{2}[

*n*]

(a) and (c)

⇒ If

*x*

*= 2*

_{k}*for*

^{k}*k*≤ 0 and = 0 for

*k*> 0 X(

*z*) = 2/(2 -

*z*).

TRUE

FALSE

⇒ During forward blocking state of SCR, the voltage and current respectively are

high and high

low and low

high and low

low and high

⇒ In PCM, if the number of quantization levels is increased from 4 to 64, then the bandwidth requirement will approximately be increased __________ times.

8

16

3

32

⇒ The horizontal intercept of dc load line is the same as ideal

cut off point

saturation point

operating point

quasi saturation point

⇒ The binary sum of 111010

_{2}and 11011

_{2}is

1010101

_{2}

1011001

_{2}

1011101

_{2}

1111111

_{2}

⇒ A rectangular waveguide of internal dimensions (

*a*= 4 cm and

*b*= 3) is to be operated in TE

_{11}mode. The minimum operating frequency is

6.25 GHz

6.0 GHz

5.0 GHz

3.75 GHz

⇒ In a network

the number of tree branches is always less than the number of links

the number of tree branches is always more than the number of links

the number of tree branches and links are always equal

the number of tree branches has no relation with the number of links

⇒ A minimum function has

poles and zeros on imaginary axis of

*s*plane

no poles or zeros on imaginary axis of

*s*plane

only poles but no zeros on imaginary axis of

*s*plane

only zeros but no poles on imaginary axis of

*s*plane

⇒ A directional coupler is used to determine

r

_{v}

r

_{v}and VSWR

L and C

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⇒ To ensure that only dominant mode TE

_{10}is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are

about 25% above

*f*

*for TE*

_{c}_{10}and 5% below

*f*

*for TE*

_{c}_{20}mode respectively

about 50% above

*f*

*for TE*

_{c}_{10}and 25% below

*f*

*for TE*

_{c}_{20}mode respectively

about 25% above

*f*

*for TE*

_{c}_{10}and 25% below

*f*

*for TE*

_{c}_{20}mode respectively

none of the above

⇒ The shape of torque-speed curve of a two phase servo- motor mostly depends on

ratio of rotor reactance to rotor resistance

ratio of stator reactance to rotor resistance

ratio of rotor reactance to rotor resistance and also the ratio of stator reactance to stator resistance

magnitude of stator voltages

⇒ For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be

elliptically polarized

linearly polarized

right circularly polarized

left circularly polarized

⇒ Which of the following alphanumeric characters is not allowed in Basic?

capital letters A to Z

lower case letters a to z

digits 0 to 9

special characters +, -, *, / etc

⇒ Which of the following is not an omnidirectional antenna?

Log periodic

Half-wave dipole

Discone

Marconi

⇒ A

*n*-type silicon sample contains a donor concentration of N

_{d}= 2 x 10

^{16}cm

^{-3}. The minority carrier hole lifetime is t

_{p0}= 5 μs. The thermal equilibrium generation rate of hole is:

1.125 x 10

^{9}cm

^{-3}s

^{-1}

0.625 x 10

^{9}cm

^{-3}s

^{-1}

4.5 x 10

^{9}cm

^{-3}s

^{-1}

2.25 x 10

^{9}cm

^{-3}s

^{-1}

⇒ A discrete time linear shift-invariant system has an impulse response

*h*[

*n*] with

*h*[0] = 1, h[1] = - 1,

*h*[2] - 2, and zero otherwise. The system is given an input sequence

*x*[

*n*] with

*x*[0] -

*x*[2] - 1, and zero otherwise. The number of nonzero samples in the output sequence

*y*[

*n*], and the value of

*y*[2] are, respectively

5, 2

6, 2

6, 1

5, 3

⇒ In a reverse biased P-N junction, the current through the junction increases abruptly at

zero voltage

1.2 V

0.72 V

breakdown voltage

⇒ Phase modulation is commonly-used for data transmission mainly because

phase can be varied from + 180° to 180°

it is resistant to the effects of noise

demodulation is very easy

it gives highest data rates that can be transmitted over a given channel