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Q1. | Wave guides are pressurised above normal atmospheric pressure for |

A. | increasing the power handling capacity [Correct Answer] |

B. | improving conductivity of walls [Wrong Answer] |

C. | preventing higher modes from propagation [Wrong Answer] |

D. | varying the wave impedance [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 :**

⇒ A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is

1 mV/pC

1.5 mV/pC

2.5 mV/pC

4 mV/pC

⇒ The amount of time between the creation and recombination of a free electron and hole is called

relaxation time

life time

lorentz time

collision time

⇒ Which of the following are the memory performance parameters?

- Access time and latency
- Block size and Block access time
- Cycle time and Bandwidth

1 only

1 and 2 only

2 and 3 only

1, 2 and 3

⇒ Substitution theorem applies to

Linear network

Non linear network

Linear time invariant network

Any network

⇒ For 0 < M < 1, the centres of M circle lie to the right of origin.

TRUE

FALSE

⇒ A hollow rectangular waveguide has dimensions

*a*= 2

*b*. Calculate the amount of attenuation, if the frequency is 3 GHz, and

*b*= 1 cm.

49

47.33

50.33

50

⇒ A delta connection contains three impedances of 60 Ω each. The impedances of equivalent star connection will be

15 Ω

20 Ω

30 Ω

40 Ω

⇒ A gate in which shift register is connected as shown in the figure below. How many clock pulse (after reset to '0') the contents of the shift register are '000' ag

3

6

16

8

⇒ A geostationary satellite is one which

hangs motionless in space about 36000 km about Earth

travels around the Earth in 24 hours

remains stationary above the Earth

appears stationary to everybody on Earth

⇒ For a periodic signal with finite number of discontinuities in each period, at isolated points of discontinuity the series converges to __________ .

difference value of signal on either side of discontinuity

highest value of signal on either side of discontinuity

average value of signal on either side of discontinuity

sum of value of signal on either side of discontinuity

⇒ In a certain network not containing any dependent sources, number of nodes = 4 and number of branches is equal to 6.

4

2

3

5

⇒ In the given figure shows a 4 bit serial in parallel out right shift register. The initial contents as shown are 0110. After 3 clock pulses the contents wil

0

101

1010

1111

⇒ For a full wave bridge rectifier supplied with 50 Hz a.c., the lowest ripple frequency will be

50 Hz

100 Hz

200 Hz

400 Hz

⇒ In the given figure the ratio T/

*d*is the duty fac

TRUE

FALSE

⇒

Match the following:

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

A. | Flash converter ADC | 1. | requires conversion time of a few μs |

B. | Dual slope ADC | 2. | requires DAC |

C. | Successive approximation ADC | 3. | minimizes the effect of power supply interference |

4. | requires complex hardware | ||

5. | is a tracking ADC |

A-2, B-3, C-4

A-4, B-3, C-2

A-5, B-4, C-3

A-1, B-2, C-5

⇒ An open coil has

zero resistance and inductance

zero resistance and high inductance

infinite resistance and zero inductance

infinite resistance and normal inductance

⇒ If B is the bandwidth, the thermal noise voltage is proportional to

B

B

^{0.5}

B

^{1.5}

B

^{2}

⇒ The most commonly used system of modulating for telegraphy is

single tone modulation

on-off keying

frequency shift keying

pulse code modulation

⇒ The most commonly used devices for differencing and amplification, in control systems, are

BJT amplifiers

FET amplifiers

operational amplifiers

either (a) or (b)

⇒ In a purely resistive circuit the instantaneous power varies from zero to maximum twice in each cycle.

TRUE

FALSE

⇒

**Assertion (A):** Heaviside partial expansion gives a simple procedure to find inverse Laplace transform of the terms having a complex conjugate pair of roots.

**Reason (R):** If I(*s*) = P(*s*)/Q(*s*) and all roots of Q(*s*) = 0 are simple, *i*(*t*) will have terms with exponentials having real exponents only.

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

⇒ The effect of source inductance in a 3 phase fully controlled bridge converter is to

decrease the output voltage

increase the output voltage

decrease the output voltage and increase the output current

increase the output voltage and decrease the output current

⇒ The Boolean function A + BC is a reduced form of

AB + BC

(A + B) . (A + C)

AB + ABC

(A + C) . B

⇒ If the voltage across the last resistor is V, and all the resistor is unity. Then V

_{s}is give

8 V

4 V

13 V

0

⇒ Which of the following is a passive component?

Semiconductor devices

Vacuum tube devices

Capacitors

All of the above

⇒ In figure, transistor β

_{dc}= 100 and LED voltage when it is conducting is 2 V. Then the base current which saturates the transisto

18 mA

1.8 mA

0.18 mA

0.018 mA

⇒ Consider the following statement : If a network has an impedance of (1 -

*j*) as a specific frequency, the circuit would consist of series

- R and C
- R and L
- R, L and C

1 and 2

1 and 3

1, 2 and 3

2 and 3

⇒ The Y plates of a CRO are excited by a voltage 2 sin 100

*t*and the X plates are not connected. The display would be

a vertical line

a horizontal line

sine wave

slant line

⇒ IC 74181 has two select lines.

TRUE

FALSE

⇒ In the circuit of figure the current through 5 Ω resistance at

*t*= 0

^{+00.4166666666666676.67 A5.1 A}