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Q1. | In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is |

A. | purely real [Wrong Answer] |

B. | purely imaginary [Correct Answer] |

C. | equal to unit [Wrong Answer] |

D. | a complex number [Wrong Answer] |

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

⇒ The wavelength of light emitted by GaAs laser is 8670 x 10

^{-10}m. If

*h*= 6.626 x 10

^{-34}Js, velocity of light = 3 x 10

^{8}m/s and eV = 1.602 x 10

^{-19}J, the energy gap in GaAs is

0.18 eV

0.7 eV

1.43 eV

2.39 eV

⇒ In Gunn diode electrons are transferred from

Ridge guide is essentially a form of capacitively loaded guide

low to high mobility energy bands

valley to domain formation

domain to valley formation

⇒ Which 8085 instruction causes exchange of contents of stack pointer with the contents of H L register pair?

`XTHL`

`PCHL`

`LHLD`

`MVIA`

⇒ As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is

14.85

220

78

3.85

⇒ Which of the following is non-sinusoidal oscillator?

Multivibrator

Relaxation oscillator using UJT

Relaxation oscillator using tunnel diode

Any of the above

⇒ The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be

32 mH

16 mH

8 mH

4 mH

⇒ The circuit in figure is switched on at

*t*= 0. At any time

*t*,

*i*(

*t3 + 3*

6 - 3

3 - 3

6 - 6

*e*^{-1}6 - 3

*e*^{-1}3 - 3

*e*^{-t}6 - 6

*e*^{-1}

⇒ The given figure shows log magnitude versus ω plots of a system for different values of gain. For this sy

curve 1 shows highest gain margin and curve 2 shows poorest gain margin

gain margins shown by the three curves are equal

curve 1 shows poorest gain margin and curve 3 shows highest gain margin

curve 3 shows poorest gain margin while curve 1 shows highest gain margin

⇒ A 6 bit ladder A/D converter has input 101001. The output is (assume 0 = 0 V and 1 = 10 V)

4.23

6.41

5.52

9.23

⇒ The signal defined by the equations

a step function

a pulse function

a shifted step function originating at

none of the above

⇒ For a short dipole having an effective length less than half the wavelength the radiation resistance is

proportional to length

proportional to square root of length

proportional to square of length

none of the above

⇒ ∈

TRUE

FALSE

⇒ The function of a choke in a fluorescent lamp is

at the time of starting only

during the working of time but not at starting time

both at the time of starting and during working

none of the above

⇒ A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is

0.0083

0.01

0.0181

none of the above

⇒ Diffraction of EM waves

arises only with spherical wave front

may occur around the edge of an obstacle

occurs when waves pass through a big slot

none of the above

⇒ An electron when placed midway between two equal and opposite charges will

remain stationary

oscillate between the charges

be thrown out of the field

spin in the field

⇒ The operating modes of 8255 A are called

mode 0 and mode 1

mode 0, mode 1 and mode 2

mode 0 and mode 2

mode 0, mode 2 and mode 3

⇒ A two branch parallel tuned circuit has 100 Ω resistance and 0.1 H inductance in one branch and 10

10 Ω

100 Ω

1000 Ω

10000 Ω

⇒ What is the period of the sinusoidal signal

10

5

1

0

⇒ Digital technologies being used now-a-days are

DTL and EMOS

TTL, ECL, CMOS and RTL

TTL, ECL and CMOS

TTL, ECL. CMOS and DTL

⇒ What does the B register contain after the first MOV B, A has been executed?

40 H

60 H

80 H

80 D

⇒ The amplifier used in bootstrap voltage sweep should have a gain of

1

+∞

-1

-∞

⇒ In an amplitude modulated waveform, the amplitude of the sideband is

independent of the carrier amplitude

independent of the modulation index

carrier amplitude x modulation index

1/2 carrier amplitude x modulation index

⇒ In 8085 microprocessor, an active low signal INTA is not needed from up service which of the following interrupt requ

TRAP

INTR

RST 7.5

RST 5.5

⇒ The characteristic equation for the next state (Q

Q

Q

Q

Q

⇒ In an R-L circuit excited by a battery of voltage E, the current and voltage across resistor are 1-

1 -

2 - 2

2 + 2

4 - 4

⇒ In cellular telephone each cell is designed to handle

45 two way communications

90 two way communications

45 one way communications

180 two way communications

⇒ To ensure that only dominant mode TE

about 25% above

about 50% above

about 25% above

none of the above

⇒ 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency

192 kHz

2 MHz

1.299 MHz

1.54 MHz

⇒ A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10

1 Ω

10 Ω

100 Ω

more than 100 Ω

⇒ The given figure shows log magnitude versus ω plots of a system for different values of gain. For this sy

curve 1 shows highest gain margin and curve 2 shows poorest gain margin

gain margins shown by the three curves are equal

curve 1 shows poorest gain margin and curve 3 shows highest gain margin

curve 3 shows poorest gain margin while curve 1 shows highest gain margin

⇒ A 6 bit ladder A/D converter has input 101001. The output is (assume 0 = 0 V and 1 = 10 V)

4.23

6.41

5.52

9.23

⇒ The signal defined by the equations

*f*(*t*) = 0 for*t*< 0,*f*(*t*) = E for 0 ≤*t*≤*a*and*f*(*t*) = 0 for*t*>*a*isa step function

a pulse function

a shifted step function originating at

*t*=*a*none of the above

⇒ For a short dipole having an effective length less than half the wavelength the radiation resistance is

proportional to length

proportional to square root of length

proportional to square of length

none of the above

⇒ ∈

_{0}has no other physical meaning than that of a fundamental conversion factor.TRUE

FALSE

⇒ The function of a choke in a fluorescent lamp is

at the time of starting only

during the working of time but not at starting time

both at the time of starting and during working

none of the above

⇒ A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is

0.0083

0.01

0.0181

none of the above

⇒ Diffraction of EM waves

arises only with spherical wave front

may occur around the edge of an obstacle

occurs when waves pass through a big slot

none of the above

⇒ An electron when placed midway between two equal and opposite charges will

remain stationary

oscillate between the charges

be thrown out of the field

spin in the field

⇒ The operating modes of 8255 A are called

mode 0 and mode 1

mode 0, mode 1 and mode 2

mode 0 and mode 2

mode 0, mode 2 and mode 3

⇒ A two branch parallel tuned circuit has 100 Ω resistance and 0.1 H inductance in one branch and 10

^{-6}F capacitor in the other. At resonance frequency, the dynamic resistance is10 Ω

100 Ω

1000 Ω

10000 Ω

⇒ What is the period of the sinusoidal signal

*x*(*n*) = 5 cos [0.2 pn]?10

5

1

0

⇒ Digital technologies being used now-a-days are

DTL and EMOS

TTL, ECL, CMOS and RTL

TTL, ECL and CMOS

TTL, ECL. CMOS and DTL

⇒ What does the B register contain after the first MOV B, A has been executed?

40 H

60 H

80 H

80 D

⇒ The amplifier used in bootstrap voltage sweep should have a gain of

1

+∞

-1

-∞

⇒ In an amplitude modulated waveform, the amplitude of the sideband is

independent of the carrier amplitude

independent of the modulation index

carrier amplitude x modulation index

1/2 carrier amplitude x modulation index

⇒ In 8085 microprocessor, an active low signal INTA is not needed from up service which of the following interrupt requ

TRAP

INTR

RST 7.5

RST 5.5

⇒ The characteristic equation for the next state (Q

_{n+1}) of a J-K flip-flop isQ

_{n+1}= JQ_{n}+ KQ_{n}Q

_{n+1}= JQ_{n}+ KQ_{n}Q

_{n+1}= JQ_{n}+ KQ_{n}Q

_{n+1}= JQ_{n}+ KQ_{n}⇒ In an R-L circuit excited by a battery of voltage E, the current and voltage across resistor are 1-

*e*^{-t}and 2(1 -*e*^{-t}) respectively. If there were an initial current of 2 A in the inductance, the voltage across resistance would have been1 -

*e*^{-t}2 - 2

*e*^{-t}2 + 2

*e*^{-t}4 - 4

*e*^{-t}⇒ In cellular telephone each cell is designed to handle

45 two way communications

90 two way communications

45 one way communications

180 two way communications

⇒ 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 areabout 25% above

*f**for TE*_{c}_{10}and 5% below*f**for TE*_{c}_{20}mode respectivelyabout 50% above

*f**for TE*_{c}_{10}and 25% below*f**for TE*_{c}_{20}mode respectivelyabout 25% above

*f**for TE*_{c}_{10}and 25% below*f**for TE*_{c}_{20}mode respectivelynone of the above

⇒ 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency

192 kHz

2 MHz

1.299 MHz

1.54 MHz

⇒ A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10

*n*F capacitor in the second branch. At resonance frequency, the dynamic resistance is1 Ω

10 Ω

100 Ω

more than 100 Ω