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Q1. | The characteristic impedance of coaxial cable is about |

A. | 1000 ohm [Wrong Answer] |

B. | 500 ohm [Wrong Answer] |

C. | 250 ohm [Wrong Answer] |

D. | 75 ohm [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ A 16-megabit dynamic random access memory (DRAM) is an integrated circuit capable of storing __________ characters (bytes).

1048567

16 x 1024 x 10

^{6}

16 x 10

^{6}

2.1 x lo

^{6}

⇒ Which amplifier has a voltage gain of less than 1?

Common emitter

Common collector

Common base

Both CB and CC

⇒ If

*x*= 0.1396 radians, the values of 1 - cos

*x*and 2 sin

^{2}(x / 2) using floating point arithmetic with a 4 digit mantissa are respectively

.1000 E - 1 each

.9727 E - 2 each

.1000 E - 1 and .9727 E - 2 respectively

.9727 E - 2 and .1000 E - 1 respectively

⇒ A reactance function is always a quotient of

even to odd polynomials

odd to even polynomials

even to odd or odd to even polynomials

even to even polynomials

⇒ In a current mirror

the

*i*-

*v*curve of compensating diode is similar to collector curve of transistor

the

*i*-

*v*curve of compensating diode is similar to transconductance curve of transistor

either (a) or (b)

neither (a) nor (b)

⇒ The PIV of a bridge rectifier is less than that of full wave rectifier with centre tapped transformer.

TRUE

FALSE

⇒ Each kilometer of travel in electromagnetic radiation means a time delay of

330 μs

33 μs

3.3 μs

0.33 μs

⇒ FM amplifier in a superheterodyne receiver

increases selectivity

suppresses noise

provides improved tracking

improves the rejection of the image frequency

⇒ The forbidden energy gap for germanium is

0.12 eV

0.32 eV

0.72 eV

0.92 eV

⇒ The Boolean function realized by the logic circuit show

F = Σ

*m*(0, 1, 3, 5, 9, 10, 14)

F = Σ

*m*(2, 3, 5, 7, 8, 12, 13)

F = Σ

*m*(1, 2, 4, 5, 11, 14, 15)

F = Σ

*m*(2, 3, 5, 7, 8, 9, 12)

⇒ In figure the output

*v*(

*t*)

phase modulated signal

amplitude modulated signal

frequency modulated signal

none of the above

⇒ If transmitted power is 75 kW, the field strength at 30 km distance will be about

10 V/m

1 V/m

50 mV/m

2 mV/m

⇒ HVDC systems are preferable for only long distances.

TRUE

FALSE

⇒ The maximum positive and negative numbers which can be represented in 2's complement form using

*n*bits are respectively

+(2

^{n + 1}- 1), - (2

^{n - 1}- 1)

+(2

^{n + 1}- 1), - 2

^{n - 1}

+2

^{n - 1}, - 2

^{n - 1}

+2

^{n + 1}, - (2

^{n - 1}+ 1)

⇒ Choose correct option

var (X + Y) = Var (X) + Var (Y)

var (X - Y) = Var (X) + Var (Y)

var (X + Y) = Var (X) x Var (Y)

Both (a) and (b)

⇒ A transistor has

- collector
- emitter
- base

I only

II only

II and III only

I and II only

⇒ The time needed by a TTL circuit to switch from 0 to 1 or 1 to 0 is about

10 μs

10 ns

100 μs

50 ns

⇒ Public address systems generally use electret microphones.

TRUE

FALSE

⇒ Which one is not a valid subscripted variable?

KET(2

^{*}J, 3

^{*}1 - 4)

MET(J + 2, K - 4)

A (2 I)

VEL(I)

⇒ The deflection sensitivity of a CRO is generally expressed in

meter/V

cm/V

V/meter

V/cm

⇒ In practical commercial AM system channel bandwidth is

150 kHz

100 kHz

15 kHz

200 kHz

⇒ The function Z(

*s*) has a pole at infinity if

the degree of numerator and denominator of Z(

*s*) 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

⇒ A 14 pin NOT gate 1C has __________ NOT gates.

8

6

5

4

⇒

Match the following:

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

A. | PMMC | 1. | Square law type scale |

B. | Moving iron | 2. | Very good response |

C. | Thermo-couple | 3. | Linear scale |

D. | Electrostatic | 4. | Voltmeter |

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

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

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

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

⇒

- P(
*s*) =*s*^{4}+*s*^{3}+ 2*s*^{2}+ 4*s*+ 3 - Q(
*s*) =*s*^{4}+ 2*s*^{3}+*s*

*s*) and Q(

*s*) polynomials?

Both P(

*s*) and Q(

*s*) are Hurwitz

Both P(

*s*) and Q(

*s*) are non-Hurwitz

P(

*s*) is Hurwitz but Q(

*s*) is non-Hurwitz

P(

*s*) is non-Hurwitz but Q(

*s*) is Hurwitz

⇒ Consider the following statements about data structures in Pascal

- Arrays and files are types of data structures.
- List structure is not a data structure in Pascal.
- Each element of a binary tree is called a node of the tree.

All

1, and 2 only

1 and 3 only

2 and 3 only

⇒

**Assertion (A):** In CE amplifier the emitter is at ground potential for ac signals

**Reason (R):** A CE amplifier has near unity voltage gain

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

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

A is correct R is wrong

A is wrong R is correct

⇒ In a 4 input AND gate, the total number of High outputs for 16 input states are

16

8

4

1

⇒ The input impedance of op-amp circuit of figur

120 k ohm

110 k ohm

infinity

10 k ohm

⇒ Between which regions does BJT act like switch?

Cut off and saturation

Cut off and forward active

Forward active and cut off

Saturation and active