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Q1. | The transformer cores operating at microwave frequency ranges are generally made up of |

A. | silicon steel [Wrong Answer] |

B. | ferrites [Correct Answer] |

C. | albino [Wrong Answer] |

D. | super alloy [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 :**

⇒ A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly

0.13 W

0.88W

7.3 W

73 W

⇒ When number of quantization levels are two; then the average transmission power in NRZ polar signaling is __________ that of NRZ unipolar signaling

42737

42739

42743

none of these

⇒ A current 10 sin (200

*t*) A flows through a 5 mH inductance. The expression for voltage is

10 sin (200

*t*+ 90°)

10 sin (200

*t*- 90°)

10 sin(1000

*t*+ 90°)

10 sin (1000

*t*- 90°)

⇒ If the peak value of output of a half wave rectifier is 100 V, the rms value is

100 V

50 V

70.7 V

35.35 V

⇒

**Assertion (A):** A two byte instruction of 8085 has an operation code in first byte and operand / address in the second byte.

**Reason (R):** If an instruction is too long it is possible to reduce its length by a number of methods.

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

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

A is correct R is wrong

A is wrong R is correct

⇒ Radiation resistance of half-wave dipole (λ/2) antenna is in free space

73 Ω

120 p

36.5 Ω

70 Ω

⇒ The distance of a direct broadcasting satellite from earth's surface is about

1000 km

10000 km

36000 km

55000 km

⇒ An antenna is 30 metre high. The frequency is 1 MHz. The radiation resistance is about

1500 Ω

150 Ω

15 Ω

1.5 Ω

⇒ Consider the following statements about directional coupler shown in the fi

1 and 2 only

3 and 4 only

1, 2 and 3

2, 3 and 4

⇒

*n*channel FETs are better as compared to

*p*-channel FET because

they are more efficient

they have high switching time

they have higher input impedance

mobility of electrons is more than that of holes

⇒ Wagner earthing device is used to eliminate error due to

electromagnetic coupling

electrostatic coupling

both electrostatic and electromagnetic coupling

either (a) or (b)

⇒ The current I

_{CBO}flows in

base and emitter leads

base and collector leads

collector and emitter leads

collector, emitter and base leads

⇒ In a CE amplifier the dc load line is the same as ac load line when

ac collector resistance and dc collector resistance are equal

ac collector resistance and dc emitter resistance are equal

ac collector resistance is very high

ac collector resistance is one half of dc collector resistance

⇒ Which impurity atom will give

*p*type semiconductor when added to intrinsic semiconductor?

Phosphorus

Boron

Arsenic

Antimony

⇒

Match the following:

List I (Operator) | List II (Description) | ||
---|---|---|---|

A. | ? : | 1. | Modulus |

B. | [ ] | 2. | Array expression |

C. | % | 3. | Conditional |

A-3, B-2, C-1

A-1, B-2, C-3

A-1, B-3, C-2

A-2, B-3, C-1

⇒ Two function

*g*

_{1}(

*t*) and

*g*

_{2}(

*t*) with correlation of 6 has average power of 4 and 5 respectively. The power of

*g*

_{1}(

*t*) +

*g*

_{2}(

*t*) is

9

21

3

15

⇒ When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are

2

3

4

5

⇒ Measurement of hall coefficient enables the determination of

mobility of charge carriers

type of conductivity and concentration of charge carriers

temperature coefficient and concentration of charge carriers

fermi level and forbidden energy gap

⇒ A Ge diode operated at a junction temperature of 27°C. For a forward current of 10 mA, V

_{D}is found to be 0.3 V. If V

_{D}= 0.4 V then forward current will be

400 mA

475 mA

477 mA

480 mA

⇒ A logical expression Y = A + AB is equal to

Y = AB

Y = AB

Y = A + B

Y = A + B

⇒ A (0.75 -

*j*50) ohm load is connected to a coaxial transmission line of Z

_{0}= 75 ohms at a frequency of 10 GHz Which of the following will be the best method of matching?

Connecting an inductance at the end

Connecting a short circuited stub at the load

Connecting a capacitance at some distance from the load

Connecting a short circuited stub at some specified distance from the load

⇒ With respect to the following 555 timer circuit what will be the value of R

_{A}and R such that the LED turns on for a duration of 10

*ms*every time it receives negative trigger pulse. LED operating current = 20

*m*A, V

_{f}= 1.4 V, V

*o*

_{on}= 13.4 V and C = 0.22

*nf*

41.4 KΩ, 600 Ω

45 KΩ, 630 Ω

43.5 KΩ, 580 Ω

44.9 KΩ, 600 Ω

41.4 KΩ, 600 Ω

45 KΩ, 630 Ω

43.5 KΩ, 580 Ω

44.9 KΩ, 600 Ω

⇒ Which one of following is correct condition to check the stability of system?

Bounded I/P unbounded O/P

Bounded I/P and O/P

Bounded O/P and I/P

Bounded I/P Bounded O/P

⇒ The 2's complement representation of the decimal number -4 is

100

1100

1011

1010

⇒ Which one of the following cannot be used to remove the unwanted sideband in SSB?

Balanced modulator

Phase shift method

Filter system

Third method

⇒ A colour television signal having bandwidth of 4.6 MHz is digitised using 10 bits sample. The digital bit rate used for its transmission with PCM would be __________ kilobits/second.

92000

920

23000

230

⇒

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

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

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

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

⇒ If figure, power dissipated in 30Ω resistance will be maximum when value of

30 Ω

16 Ω

9 Ω

zero

⇒ Human ear can detect sound intensities of the order of

10

10

10

10

⇒ The colour on the extreme left in general purpose fixed resistors represents

first significant digit

tolerance

wattage rating

voltage rating

⇒ Which one of following is correct condition to check the stability of system?

Bounded I/P unbounded O/P

Bounded I/P and O/P

Bounded O/P and I/P

Bounded I/P Bounded O/P

⇒ The 2's complement representation of the decimal number -4 is

100

1100

1011

1010

⇒ Which one of the following cannot be used to remove the unwanted sideband in SSB?

Balanced modulator

Phase shift method

Filter system

Third method

⇒ A colour television signal having bandwidth of 4.6 MHz is digitised using 10 bits sample. The digital bit rate used for its transmission with PCM would be __________ kilobits/second.

92000

920

23000

230

⇒

Match the following:

List I (Logic family) | List II (Characteristic) | ||
---|---|---|---|

A. | TTL | 1. | Maximum power consumption |

B. | ECL | 2. | Highest packing density |

C. | NMOS | 3. | Least power consumption |

D. | CMOS | 4. | Saturated Logic |

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

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

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

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

⇒ If figure, power dissipated in 30Ω resistance will be maximum when value of

30 Ω

16 Ω

9 Ω

zero

⇒ Human ear can detect sound intensities of the order of

10

^{-4}W/m^{2}10

^{-8}W/m^{2}10

^{-13}W/m^{2}10

^{-18}W/m^{2}⇒ The colour on the extreme left in general purpose fixed resistors represents

first significant digit

tolerance

wattage rating

voltage rating