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Q1. | The poles and zeros of a positive real function |

A. | may lie any where in s plane [Wrong Answer] |

B. | may have positive or negative real part [Wrong Answer] |

C. | must occur in conjugate pair [Wrong Answer] |

D. | must have either negative or zero real part [Correct Answer] |

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

⇒ 7483 is a TTL binary adder. It can add

two 4-bit binary numbers

four 6-bit binary numbers

four 8-bit binary numbers

any number of 4-bit numbers

⇒ A first order system will never be able to give a __________ response

- band stop
- band pass
- all pass

1, 2, 3 true

1 and 3 true, 2 false

1, 2 are true 3 is false

1, 2 are false, 3 is true

⇒ A function Z(

*s*) has zero at infinity if

the degree of numerator and denominator are equal

the numerator of Z(

*s*) is one degree higher than denominator

the denominator of Z(

*s*) is one degree higher than numerator

the degree of numerator and denominator are either equal or differ by one

⇒ Consider the following statements

- Dissipative attenuator has a fixed value of attenuation.
- Reflective attenuator has a fixed value of attenuation.
- Both dissipative and reflective attenuators are available only with fixed attenuation.
- Both dissipative and reflective attenuators are available with either fixed or variable attenuation.

1 only

1 and 2

1, 2 and 3

4 only

⇒ In waveguide Degenerate modes are

two mode having same cut off frequency

two mode having same power

two mode having same phase velocity

it is a hypothetical mode

⇒ Which of the following circuit does not need a coupling capacitor?

Resistance loaded

Transformer coupled

Impedance coupled

Single tuned

⇒ Two transistors have same value of a but different gain (G) bandwidth (B) product. The transistors have similar geometry. However one of them is germanium and the other is silicon. The transistor with lower GB product

is germanium

is silicon

may be either of two

cannot be identified on the basis of above data

⇒ A seven bit code (even parity) 1111101 may have error. The correct code is

1111101

1111111

101011

1100011

⇒ One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

improved efficiency

better linearity

high power output per transistor

the lower modulating power requirement

⇒ Pulse modulation is often used in

microwave band

FL band

telegraphy

telephony

⇒ If the potential functions V

_{1}and V

_{2}satisfy Laplace's equation within a closed region and assume the same values on its surface, then which of the following is correct?

V

_{1}and V

_{2}are identical

V

_{1}is inversely proportional to V

_{2}

V

_{1}has the same direction as V

_{2}

V

_{1}has the same magnitude as V

_{2}but has different direction

⇒ Wagner earthing device is used to eliminate error due to

electromagnetic coupling

electrostatic coupling

both electrostatic and electromagnetic coupling

either (a) or (b)

⇒ Which of the following is true?

The poisson distribution is limiting case of binomial distribution.

In symmetrical distribution, the mean, median and mode coincide.

Regression is the estimation or production of unknown values of one variables from known values of another variable.

All are true.

⇒ A coil has resistance R and inductance L. At ω = ∞ the phase angle between voltage and current is

0°

180°

45°

90°

⇒ Which TM mode in rectangular waveguide has lowest cutoff frequency?

TM

_{11}

TM

_{01}

TM

_{10}

TM

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⇒ Spot the odd one out

aluminium

silver

porcelain

copper

⇒ The first and the last critical frequency of an

*RC*driving point impedance function must respectively by

a zero and a pole

a zero and a zero

a pole and a pole

a pole and a zero

⇒ The relation between plate current and plate voltage of a vacuum diode is called

Richardson Dushman equation

Langmuir Child law

Ohm's law

Boltzmann's law

⇒ Class A and class B chopper

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operate in second quadrant

class A chopper operates in first quadrant while class B operates in second quadrant

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⇒ A device which converts BCD to seven segment is called

encoder

decoder

multiplexer

none of these

⇒ In figure, the switch is initially open. At

*t*= 0 switch is closed.

*v*

_{c}(0

^{+}) and

*i*

_{L}(0

^{+})

60 V and - 0.3 A

150 V and zero

zero and 0.3 A

90 V and - 0.3 A

⇒ In intrinsic semiconductor magnitude of free electron and hole concentrations are equal.

TRUE

FALSE

⇒ In Z

_{RC}(

*s*) = constant at

*s*= 0, the last element in first Foster cauer realization is

R

C

R and C in series

R and C in parallel

⇒ The ripple factor of a full wave rectifier is about 0.5

TRUE

FALSE

⇒ Which of the following pulse-time modulation is least used?

PDM

PPM

PWM

PAM

⇒ The purpose of incorporating a pre-selector stage in a receiver is to

provide higher selectivity

provide higher fidelity

improve linearity

larger passband

⇒ In a computer the data transfer between hard disk and CPU is nearly the same as that between diskette and CPU.

TRUE

FALSE

⇒ At high frequencies the output circuit of transistor amplifier reduces to

a lead network

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neither (a) nor (b)

⇒ The noise temperature of sky is about __________ °K.

100

273

0

30

⇒ A 12 bit ADC is operating with 1 μs clock period. Total conversion time is 14 μs. ADC is

flash type

counting type

integrating type

successive approximation type