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Q1. | The cut off wavelength in circular waveguide |

A. | guide diameter [Correct Answer] |

B. | square of guide diameter [Wrong Answer] |

C. | cube of guide diameter [Wrong Answer] |

D. | square root of guide diameter [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ In a loss-free R-L-C circuit the transient current is

oscillating

square wave

sinusoidal

non-oscillating

⇒

**Assertion (A):** The conductivity of an *n* type semiconductor increases with increase in temperature and increase in density of donor atoms.

**Reason (R):** Diffusion of carriers occurs in semiconductors.

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

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

A is true but R is false

A is false but R is true

⇒ A balun should have

low SWR at both ports

high SWR at both ports

high SWR at input port and low SWR at output port

low SWR at input port and high SWR at output

⇒ In parallel in-parallel out shift register all bits are loaded and read simultaneously.

TRUE

FALSE

⇒ The reason for glitches on the outputs of decoding gates on a synchronous counter is

FFs changing states together

FFs changing states one at a time

AND gates not functioning properly

none of the above

⇒ For circuit in figure, which combination of V

_{TH}and R

_{TH}represents the circuit as seen from

*ab<*

1 V, 10 Ω

1 V, 1000 Ω

1 mV, 1000 Ω

1 mV, 10 Ω

1 V, 10 Ω

1 V, 1000 Ω

1 mV, 1000 Ω

1 mV, 10 Ω

⇒ Consider the following statements about polar plots

Both are correct

Both are wrong

1 is correct and 2 is wrong

2 is correct and 1 is wrong

⇒ For an amplifier the input output signals are shown in figure. The class of amplifie

A

AB

B

C

⇒ Varactor diodes use

silicon

GaAs

either (a) or (b)

neither (a) nor (b)

⇒ The operating voltage of a megger is about

100 V

12 V

6 V

1 V

⇒ A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is

25 Ω

50 Ω

225 Ω

250 Ω

⇒ The function shown in the given Figure can be writte

sum of two sinusoidal functions

sum of two sinusoidal functions one originating at

difference of two sinusoidal functions one originating at

none of the above

⇒ Which of the following is not a special purpose peripheral?

Programmable DMA controller

Programmable Floppy disc controller

Programmable Hard disc controller

Programmable CRT controller

⇒ The scale factor for half wave and full wave rectifier is __________ respectively.

1.11, 1.414

1.11, 1.57

1.57, 1.11

1.414, 1.11

⇒ For a transistor if a

0.44 mA

0.88 mA

1.96 mA

3.32 mA

⇒ In 8085, which of the following is an 8 bit register?

A

SP

PC

both (a) and (b)

⇒ In the given figure, the number of individual loop

2

4

5

6

⇒ A white noise

5 x 10

1 x 10

2 x 10

5 x 10

⇒ Figure shows an 8-bit LED display. A light circle means that a LED is ON (binary 1) and a dark circle means a LED is OFF (binary 0). What is the decimal equivalent of the binary number displa

100

121

144

172

⇒ In figure, the time constant for the capacitor chargin

6 μ

10 μ

15 μ

25 μ

⇒ How many zone bits are th

2

4

8

16

⇒

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

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

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

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

⇒

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

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

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

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

⇒ In Weston synchronoscope the fixed coils are connected across

bus bars

incoming alternator

lamp

either (a) or (b)

⇒ To avoid the effect of stray magnetic fields in ac bridge we can use

magnetic screening

Wagner earthing device

wave filter

transformer

⇒ An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is

0.1 V/mm

0.5 V/mm

1 V/mm

5 V/mm

⇒ The sign of a floating point number depends on

only the sign of mantissa

only the sign of exponent

the sign of both mantissa and exponent

either (a) or (b)

⇒

A-4, B-2, C-1

A-2, B-1, C-3

A-3, B-4, C-1

A-2, B-3, C-1

⇒ Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is

zero

90°

either zero or 180°

either 90° or 270°

⇒ According to Barkhausen criteria in order to sustain the oscillations

loop gain of the circuit must be negligible

loop gain of the circuit must be equal to unity

the phase shift around the circuit must be 180°

none of the above

⇒ Consider the following statements about polar plots

- Addition of a non-zero pole to a transfer function results in further rotation of polar plot through an angle of - 90° as ω → ∞
- Addition of a pole at the origin to a transfer function rotates the polar plot at zero and infinite frequencies by a further angle of - 90°

Both are correct

Both are wrong

1 is correct and 2 is wrong

2 is correct and 1 is wrong

⇒ For an amplifier the input output signals are shown in figure. The class of amplifie

A

AB

B

C

⇒ Varactor diodes use

silicon

GaAs

either (a) or (b)

neither (a) nor (b)

⇒ The operating voltage of a megger is about

100 V

12 V

6 V

1 V

⇒ A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is

25 Ω

50 Ω

225 Ω

250 Ω

⇒ The function shown in the given Figure can be writte

sum of two sinusoidal functions

sum of two sinusoidal functions one originating at

*t*= 0 and the other at*t*= 1difference of two sinusoidal functions one originating at

*t*= 0 and the other at*t*= 1none of the above

⇒ Which of the following is not a special purpose peripheral?

Programmable DMA controller

Programmable Floppy disc controller

Programmable Hard disc controller

Programmable CRT controller

⇒ The scale factor for half wave and full wave rectifier is __________ respectively.

1.11, 1.414

1.11, 1.57

1.57, 1.11

1.414, 1.11

⇒ For a transistor if a

_{dc}= 0.98 and emitter current*I*_{E}is 2*mA*, then collector current will be0.44 mA

0.88 mA

1.96 mA

3.32 mA

⇒ In 8085, which of the following is an 8 bit register?

A

SP

PC

both (a) and (b)

⇒ In the given figure, the number of individual loop

2

4

5

6

⇒ A white noise

*X*(*t*) with two-sided power spectral density 1 x 10^{-10}W/Hz is input to a filter whose magnitude squared response is shown be5 x 10

^{-7}W1 x 10

^{-6}W2 x 10

^{-6}W5 x 10

^{-6}W⇒ Figure shows an 8-bit LED display. A light circle means that a LED is ON (binary 1) and a dark circle means a LED is OFF (binary 0). What is the decimal equivalent of the binary number displa

100

121

144

172

⇒ In figure, the time constant for the capacitor chargin

6 μ

*s*10 μ

*s*15 μ

*s*25 μ

*s*⇒ How many zone bits are th

2

4

8

16

⇒

Match the following:

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

A. | Multiplexer | 1. | Sequential memory |

B. | De-multiplexer | 2. | Converts decimal number to binary |

C. | Shift register | 3. | Data selector |

D. | Encoder | 4. | Routes single input to many outputs |

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

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

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

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

⇒

Match the following:

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

A. | Tangent galvanometer | 1. | Can be used for dc only |

B. | Moving coil instrument | 2. | Integrating instrument |

C. | Household energy meter | 3. | Used for voltage measurement only |

D. | Electrostatic instrument | 4. | Absolute instrument |

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

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

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

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

⇒ In Weston synchronoscope the fixed coils are connected across

bus bars

incoming alternator

lamp

either (a) or (b)

⇒ To avoid the effect of stray magnetic fields in ac bridge we can use

magnetic screening

Wagner earthing device

wave filter

transformer

⇒ An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is

0.1 V/mm

0.5 V/mm

1 V/mm

5 V/mm

⇒ The sign of a floating point number depends on

only the sign of mantissa

only the sign of exponent

the sign of both mantissa and exponent

either (a) or (b)

⇒

Match the following:

List I (Component) | List II (Dominant TE mode) | ||
---|---|---|---|

A. | Rectangular wave guide | 1. | TE_{101} |

B. | Circular waveguide | 2. | TE_{10} |

C. | Rectangular cavity | 3. | TE_{111} |

4. | TE_{11} |

A-4, B-2, C-1

A-2, B-1, C-3

A-3, B-4, C-1

A-2, B-3, C-1

⇒ Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is

zero

90°

either zero or 180°

either 90° or 270°

⇒ According to Barkhausen criteria in order to sustain the oscillations

loop gain of the circuit must be negligible

loop gain of the circuit must be equal to unity

the phase shift around the circuit must be 180°

none of the above