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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 :**

⇒ Which of the following laws of electromagnetic theory is associated with the force experienced by two loops of a wire carrying currents?

Maxwell's law

Coulomb's law

Ampere's law

Laplace's law

⇒ A sinusoidal signal is measured by CRO. The scale is set at 4 mV/cm. If vertical distance between positive and negative peaks is 6 cm, the peak value of ac signal is

6 mV

12 mV

24 mV

3 mV

⇒ Aperture circuit produces __________ in sample hold circuit.

the total sampling time

delay between the instance at which hold command is initiated and the instance at which O/P starts tracking I/P

the time taken by O/P to settle within the specified 1% error band, that of the I/P

time required by holding capacitor to reach upto the level close to input

⇒ If A = 3 +

*j*1 and B = 4 +

*j*3, A + B =

7 ∠45°

10 ∠45°

8.062 ∠29.7°

8.062 ∠73°

⇒ The multiplication time for 10-bit numbers with 1 MHz clock will be

32 μ sec

20 μ sec

21 μ sec

22 μ sec

⇒ Overall efficiency of class B amplifier is

0.72

0.75

0.785

0.7

⇒ The intrinsic resistivity of silicon at 300 K is about

1 Ω-cm

400 Ω-cm

10000 Ω-cm

230000 Ω-cm

⇒ Which of the following does not cause losses in optical fibre cables?

Stepped index operation

Impurities

Microbending

Attenuation in glass

⇒ The complete video signal consists of

video signal and synchronising pulses

video signal, synchronising pulses and blanking pulses

video signal corresponding to picture information only

video signal and blanking pulses

⇒ 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 signal with ± 10 V ranged and 1 KHz band width is being digitized using a sample and hold circuit and a 10 bit quantizer. The minimum sampling rate is :

62831.9 V/sec

125663.8 V/sec

31415.95 V/sec

None

⇒ RMS value of a square wave is the same as peak value.

TRUE

FALSE

⇒ The resonant frequency of a series resonant circuit is

arithmetic mean of half power frequencies

independent of inductance of the circuit

independent of capacitance of the circuit

geometric mean of half power frequencies

⇒ For TV broadcast, picture signal is modulated in

SSB

VSB

FM

AM

⇒ Two coupled coils with self inductances of 4 mH and 16 mH are connected in series. The maximum possible value of inductance can be

36 mH

20 mH

28 mH

64 mH

⇒ For very low frequencies,

*v*

_{0}/

*v*

_{i}in the given figure eq

1

0

∞

0.5

⇒ It is very likely in __________ gate family that when one gate is driving number of gates in __________ , a gate having least voltage for saturation may consume large __________ leaving other gates inoperative and this phenomenon is called __________ .

DTL, parallel, current, current - sinking

DCTL, parallel, current, current-lagging

ECL, series, voltage, voltage-deterioration

DCTL, series, current, current-lagging

⇒ An iron specimen has µ

_{r}= 1000 when B = 0.3 T. If B = 0.35 T, µ

_{r}

will be 1000

will be less than 1000

will be more than 1000

may be more or less than 1000

⇒ If

*f*(

*t*)↔ F(

*j*ω), and

*f*(

*t*) is real, then F(-

*j*ω)

*F*(

*j*ω)

*F**(

*j*↔)

*F**(-

*j*ω)

none of these

⇒ The system in the given figur

type 0 system

type 1 system

type 2 system

type 3 system

⇒ A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to

decrease the firing angle

increase the firing angle

either decrease or increase the firing angle depending on the required speed

decrease the load torque

⇒ A moving iron instrument gives correct reading when used at

low frequencies

high frequencies

only one frequency

all frequencies upto a certain value

⇒ For infinite value of SWR on a transmission line, the line be terminated with impedance as

an open-circuit

a short-circuit

a pure resistance

all of the above

⇒ The attenuation characteristics of a loaded line is similar to that of

low pass filter

high pass filter

band pass filter

band stop filter

⇒

Match the following:

List I (Octal) | List II (Hexadecimal) | ||
---|---|---|---|

A. | 66 | 1. | 3 F |

B. | 77 | 2. | 36 |

C. | 55 | 3. | 27 |

D. | 47 | 4. | 3D |

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

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

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

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

⇒ Internally the two distinct units of 8086 are called

bus interface unit and execution unit

command unit and follow unit

master unit and slave unit

memory unit and operation unit

⇒ A seven bit (even parity) code 0010001 may have error. The correct code is

10001

1110001

11001

1111110

⇒ Consider the following statements about root locus

- The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterion
- Segments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locus
- The number of root locus branches terminating on infinity is always zero

1, 2 and 3

1 and 2 only

1 only

2 and 3 only

⇒ The forbidden energy gap for silicon is

0.12 eV

1.12 eV

0.72 eV

7.2 eV

⇒ If number of information bits is 4, the parity bits in Hamming code are located at bit positions __________ from the LSB.

1, 2, 5

1, 2, 4

1, 2, 3

1, 2