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Q1. | The gain of an antenna with a circular aperture of diameter 3 metres at a frequency of 5 GHz, will be |

A. | 2.4674 [Wrong Answer] |

B. | 24.674 [Wrong Answer] |

C. | 246.74 [Wrong Answer] |

D. | 24674 [Correct Answer] |

View Answer
Explanation:-
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⇒ Reflex klystron oscillator is essentially a low power device

TRUE

FALSE

⇒ High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to

reduce dc resistance

reduce ac resistance

increase dc resistance

increase ac resistance

⇒ Which one of the following power amplifier has the maximum efficiency?

Class A

Class B

Class AB

Class C

⇒ The residual resistivity of a binary alloy at 0 K is

sum of residual resistivities of component metals

difference of residual resistivities of component metals

product of residual resistivities of component metals

dependent on the concentration of minor component in the alloy

⇒ The depth of penetration at 4 MHz is 10 cm, then at 2.5 MHz it is

62.5 cm

13 cm

6.25 cm

8 cm

⇒ For real and odd signals, the Fourier series coefficient

*a*is

_{n}purely imaginary

purely real and even

purely imaginary and odd

purely real and odd

⇒ For H(

*s*) to be positive real, the condition Re[H(

*j*ω)] ≥ 0 for 0 ≤ ω ≤ ∞ is

a necessary condition

a sufficient condition

a necessary and sufficient condition

is not a necessary condition

⇒ The internal structure of PL A is similar to

RAM

ROM

both RAM and ROM

neither RAM nor ROM

⇒ The emitter resistor R

_{E}in the emitter of CE amplifier stabilizes the dc operating point against variation in

temperature only

β of transistor

both temperature and β

none of the above

⇒ In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is

36

18

12

8

⇒ 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

⇒ A 2 bit binary multiplier can be implemented using

2 I/P only

2 I/P XOR

*and 4 I/P and gates only*

_{s}two 2 I/P

_{s}NOR and one XNOR gate

XOR gates and shift Register

⇒ Consider the following types of distortions in diode detectors

- Distortion is caused due to the reason that dc and ac load impedances are unequal
- Distortion is caused because ac load impedance has a reactive component at high audio frequencies
- Audio frequency diode current is less than dc current

1, 2 and 3

1 and 2

1 and 3

2 and 3

⇒ A magnetron requires an external magnetic field with flux lines parallel to axis of cathode

TRUE

FALSE

⇒ Dynamic range of hi-fi system is at least

150 dB

120 dB

80 dB

40 dB

⇒ If the circumference of a spherical target is between 1 to 10 wavelength in a radar system, the situation is called

resonance region

Rayleigh region

optical region

binomial region

⇒

Match the following:

List I (Form) | List II (Network) | ||
---|---|---|---|

A. | Cauer I | 1. | L in series arm and C in shunt arm of ladder |

B. | Cauer II | 2. | C in series arm and L in shunt arm of ladder |

C. | Foster I | 3. | Series combination of L and C in parallel |

D. | Foster II | 4. | Parallel combination of L and C in series |

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

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

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

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

⇒ The D'Arsonval- movement can be converted into audio frequency ac ammeter by adding a

thermocouple

transducer

chopper

rectifier

⇒ Which of the following produces very wide drifts in clock frequency?

Crystal

RC circuit

LC resonant circuit

Crystal and RC circuit

⇒ Which bridge can be used to measure frequency?

Maxwell

Kelvin

Schering

Wein

⇒ Instruction cycle is the time required to complete the execution of an instruction.

TRUE

FALSE

⇒ The term critical frequency denotes

the lowest frequency that is reflected by the ionosphere

the highest frequency that is reflected by the ionosphere at vertical distance

the lowest frequency by which communication is possible between two given points

none of the above

⇒ When cells having different emfs are connected in parallel, a circulating current flows.

TRUE

FALSE

⇒ The function Y = A B C + AB C + A B C + A BC is to be realized using discrete gates. The inputs available are A, B, C. We need a total of

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6 gates

10 gates

5 gates

⇒ The number of interrupt lines in 8085 is

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3

4

5

⇒ If reflection coefficient is 1/5, then corresponding VSWR is given by

1

2

3

42796

⇒ An RLC series circuit has Q = 100 and ω

_{0}= 20 rad/sec. The bandwidth is

0.2 rad/sec

2 rad/sec

20 rad/sec

2000 rad/sec

⇒

Match the following:

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

A. | Evanescent wave | 1. | Pattern multiplication |

B. | Skip distance | 2. | Mismatched transmission line |

C. | Return loss | 3. | Propagation in lossy medium |

D. | Antenna array | 4. | Short wave propagation |

5. | Propagation below cut-off |

A-5, B-2, C-4, D-3

A-2, B-4, C-1, D-5

A-5, B-4, C-2, D-1

A-1, B-3, C-4, D-5

⇒ The 2732 is 4096 x 8 EPROM. How many address lines does it have?

12

24

50

100

⇒ The figure shown below is designed to act as a constant current source across the load resistor. The β of transistor is 50. What is the value of load curr

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2.04 mA

None