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Q1. | A rectangular waveguide, in dominant TE mode, has dimensions 10 cm x 15 cm. The cut off frequency is |

A. | 10 GHz [Wrong Answer] |

B. | 1 GHz [Correct Answer] |

C. | 15 GHz [Wrong Answer] |

D. | 25 GHz [Wrong Answer] |

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

⇒ In a synchro transmitter

input is angular position of rotor shaft and output is stator voltages

input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft

input is rotor voltage and output is angular position of rotor shaft

input is angular position of rotor shaft and output is rotor voltage

⇒ Consider the following statements about an array in Pascal

- An array has a fixed predetermined number of components.
- Any component of an array can be accessed using an index.
- An array variable name refers to a group of quantities by a single name.
- When array variables are used an appropriate declaration is required.

All

1, 2, 3 only

2, 3, 4 only

1, 2 and 4 only

⇒ For most static RAM the maximum access time is about

1

*ns*

10

*ns*

100

*ns*

1 μ

*s*

⇒ If any term in the first column of a Routh array becomes zero, then

Routh criterion cannot be used to determine stability

Routh criterion can be used by substituting a small positive number for zero and completing the array

Routh criterion can be used by substituting a big positive number for zero and completing the array

Routh criterion can be used by substituting a small negative number for zero and completing the array

⇒ An op-amp has zero gain for common mode inputs. Then CMRR =

zero

infinite

high

low

⇒

Match the following:

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

A. | Continuous and aperiodic | 1. | Fourier representation is continuous and aperiodic |

B. | Continuous and Periodic | 2. | Fourier representation is discrete and aperiodic |

C. | Discrete and aperiodic | 3. | Fourier representation is continuous and periodic |

D. | Discrete and periodic | 4. | Fourier representation is discrete and periodic |

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

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

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

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

⇒ The current wave shown in figure is applied by a 0.1 F capacitor at

*t*= 0. At

*t*= 0

^{+}, the voltage across capacito

0

4 V

10 V

20 V

⇒ Which multivibrator can be used as a clock timer?

Astable multivibrator

Bistable multivibrator

Any of the above

None of the above

⇒ A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

1 kHz

2 kHz

4 kHz

8 kHz

⇒ The maximum number of AM broadcast stations that can be accommodated in a 100 kHz bandwidth for the highest modulating frequency of 5 kHz will be

100

20

10

1

⇒ Fourier transform and F(

*j*ω) of a signal

*f*(

*t*) has the property

F(

*j*ω) = F(-

*j*ω)

F(

*j*ω) = -F(-

*j*ω)

F(

*j*ω) = F

^{*}(

*j*ω)

F(

*j*ω) = -F

^{*}(-

*j*ω)

⇒

**Assertion (A):** Impulse function is an important function in network analysis.

**Reason (R):** Convolution integral enables us to find the response of a network to an arbitary input in terms of the impulse response.

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 true, R is false

A is false, R is true

⇒ Some desirable features of a computer communication network are

- It should accept an intended transmission without excessive delay
- The data arriving at a receiving point should be processed rapidly
- When a transmission calls for a response, the delay of response should be minimum.

1 and 2 only

1 and 3 only

1, 2, 3

2 and 3 only

⇒ The dimension of flux density is

MT

^{-1}Q

^{-1}

MT

^{-2}

MT

^{1}Q

^{1}

MT

^{-1}Q

^{-2}

⇒ Unit doublet is the Laplace inverse of __________ .

1/

*s*

*s*

^{2}

*s*

none of these

⇒ In 8085 the pins for + 5 V input and ground are

20 and 40 respectively

40 and 20 respectively

1 and 2 respectively

1 and 1 respectively

⇒ In a resistance loaded amplifier, the gain decreases at high frequencies because

decreasing reactance of the stray C

_{T}

increasing reactance of the stray C

_{T}

increasing reactance of C

_{T}

decreasing reactance of C

_{T}

⇒ In a minimum function

the degree of numerator is higher than that of denominator

the degree of numerator is lower than that of denominator

the degree of numerator and denominator are equal

the denominator is a constant

⇒ NAND gates can be used to produce edge triggering.

TRUE

FALSE

⇒ Which has the highest power dissipation per gate?

ECL

TTL

CMOS

PMOS

⇒ The positive peak of an AM wave is 16 V and the minimum value is 4 V Assuming single tone modulation, the modulation index is

0.6

0.25

4

0.36

⇒ Figure represen

JFET shunt switching circuit

JFET series switching circuit

JFET analog switch

multiplexing

⇒ Network transients are due to

circuit resistance

circuit voltage

changes in energy stored in L and C

circuit admittance

⇒ Consider the following statements:

- Internal sorting is used if the number of items to be sorted is very large.
- External sorting is used if the number of items to be sorted is vary large.
- External sorting needs auxiliary storage.
- Internal sorting needs auxiliary storage.

1 and 2

2 and 3

3 and 4

2 and 4

⇒ The amount of photoelectric emission current depends on the frequency of incident light.

TRUE

FALSE

⇒ The circuit in figure, the switched on at

*t*= 0. After a long time the current through 5 Ω resistanc

0.0416666666666667

0.166666666666667

0.416666666666667

0

⇒ The p mode of operation of magnetron signifies that

the phase difference between adjacent anode poles is p radians

the phase difference between adjacent anode poles is a multiple of p radians

the total phase shift around the periphery is p radians

none of the above

⇒ The ratio of the diffusion coefficient in a semiconductor has the units

V

^{-1}

em.V

^{-1}

V.cm

^{-1}

V.

*s*

⇒ A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be

20 kΩ

19.9 kΩ

1.9 kΩ

20.1 kΩ

⇒ The system with given pole-zero diagra

casual

non-casual

both sided

not-possible