Hindustan Aeronautical Limited
Management Trainee
Electronics And Communication
Q.1.When a large number of analog signals is to be converted to digital form, an analog multiplex or is used. The A to D converter suitable in this case will be ..“
- dual slope type
- up down counter type
- Successive approximation type
- forward counter type
Q.2 .In the formation of Routh's array the situation of a row of zeros indicates that the system-
- has symmetrically located roots
- is not sensitive to variations in gain
- is stable
- is unstable
Q.3 Mark out wrong statement. Modulation is used to-
- Reduce the bandwidth used
- Separate differing transmissions
- Ensure that intelligence may be transmitted over long distances
- Allow the use of practicable antennas
Q.4.Mark out a wrong statement for two phase servo motor-
- The rotor diameter is small
- The rotor resistance is low
- The applied voltages are seldom balanced
- The torque speed characteristic is linear.
Q.5.The frequency deviation in phase modulation is-
- independent of the modulating signal frequency
- inversely proportional to the modulating signal frequency
- directly proportional to the modulating signal frequency.
- inversely proportional to the square root of the modulating frequency.
Q.6.Which power amplifiers has maximum efficiency?
- Class A
- Class AB
- Class B
- Class C
Q.7.Negative resistance characteristics for its operation is used by .....
- TWT
- Klystron
- Magnetron
- MASERS
Q.8..Choose the most appropriate word from the options given below to complete the following sentence. Comparatively few rock musicians are willing to laugh at themselves, although a hint of .......... can boost sales of video clips very nicely.
- self-deprecation
- congeniality
- cynicism
- embarrassment
Q.9.The binary equivalent of 9.37510 is ......
- 1001.011 2
- 1101.101 2
- 100.011 2
- 1111.001 2
Q.10.The output signal amplitudes for1's and 0's in an ADM transmission system ....
- Fixed and the repetition rate is also fixed
- Fixed but the repetition rate is variable
- Variable and the repetition rate is also variable
- variable but the repetition rate is fixed
Q.11.For an RC driving point impedance function, the poles and zeros-
- should alternate on real axis
- should alternate only on the negative real axis
- should alternate on the imaginary axis
- can lie anywhere on the left half place.
Q.12.Mark out wrong statement regarding compndor-
- It compresses the higher amplitude parts of a signal before modulation and expands them back to normal again after demodulation.
- It gives preferential treatment to the weaker parts of the signal
- For weaker signals, it gives a poor ratio of signal strength to quantizing error
- Weaker signals, transverse more quantum steps than they would do otherwise and so quantizing error is reduced
Q.13 .Among other equipment a sub marine cable repeater contains .....
- A dc power supply and regulator
- Filters for the two directions of transmission
- Multiplexing and de-multiplexing equipment
- Pilot inject and pilot extract equipment
Q.14.In a communication system noice is most likely to affect the signal-
- At the transmitter
- In the channel
- In the information source
- At the destination
Q.15.In gunn effect oscillator which mode having lowest operating frequency ....
- mode
- Delayed domain mode
- Quenched domain mode
- LSA mode
Q.16.In Reflex klystron maximum energy transferred to gap by electrons-
Q.17.The radio waves get absorbed by atmosphere depends -
- Their distance from transmitter is long
- Wave power is weak
- Improper polarization of wave
- Frequency of waves
Q.18.8085 mP has no of sets of communication lines-
Q.19.The diversity system in Troposcatter links is made use of to-
- a.Increase the bandwidth
- b.Prevent noise effects
- Increase the directivity of the antenna
- d.Detect signal in the presence of fading.
Q.20.The plate efficiency of a class C amplifier is high because-
- A resonant circuit is used as load
- The plate current flows when the instantaneous plate voltage is low.
- The plate current flows only when grid is driven positive
- None of the above
Q.21.The Nyquist plot of G (jw), H (jw) for a closed-loop control system, passes through (-1,j0) point in the GH-plane. The gain margin o the system in dB is equal to
- infinite
- greater than zero
- less than zero
- zero
Q.22. Where is the hole concentration is greatest?
- x = 0
- x = L/2
- x = L
- Uniform
Q.23.Where is the electron concentration is greatest?
- x = 0
- x = L/2
- x = L
- Uniform
Q.24.In a direct election between two contestants, 4% of the votes cost are declared to be illegal. One contestant secures 55% of the valid votes and wins with a majority of 240 votes. What is the total number of votes cost ?
- 2455
- 2400
- 2500
- None of these
Q.25.There are two groups A and B consisting of 30 and 70 students respectively. If the average weight of group A is 30 kg and that of group B is 70 kg. Find the average weight of all the students of group A and group B.
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