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BSNL JE Basic Engineering Section Test 5

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Question 1

Statement(I): A monostable multi-vibrator when swiched on remains in a quasi stable state .
Statement (II): Quasi stable state duration is decided by charging time of capacitor

Question 2

The system response can be tested better with

Question 3

Which of the following devices cannot be used as microwave oscillator:

Question 4

In the order to obtain repetitive pulses of unequal mark space one can use:
1) A voltage comparator fed with a triangular wave signal and dc voltage.
2) An astable multi-vibrator
3) A mono-stable multi-vibrator fed with a square wave input

Question 5

How much (approximate) is the frequency Independent power factor of a plastic dielectric capacitor?

Question 6

Non-polar electrolytic capacitors

Question 7

Consider the following statements:
In amplifiers,
1) a complementary symmetry amplifier has 1 PNP and 1 NPN transistor.
2) a boot strap incorporates emitter follower.
3) the main function of transformer used in the output of a power amplifier is to increase its voltage gain.
4) the harmonic distortion of the signal produced in na RC coupled transistor amplifier is due to transformer itself.
Which of these statements are correct?

Question 8

Which of the following characteristics are possessed by a transformer-coupled class B push-pull power5 amplifier?
1) It eliminate even harmonic distortion
2) It suffers from cross-over distortion
3) Its device rating are higher than those of class-A power amplifier.
4) Its collector circuit afficiency is more than that of class C power amplifier.
Select the correct answer using the code given below:

Question 9

Consider the following statements:
1) Astable multivibrator can be used for generating square wave.
2) Bistable multivibrator can be used for storing binary information.
Which of these statements is /are correct?

Question 10

Covert the decimal 41.6875 into octal.

Question 11

When using a sequential code to design combinational logic in VHDL, if complete truth table is not defined, the synthesis tool will implement a ______ which is not required

Question 12

Consider the following statements:
1) Only even harmonic are present in the output.
2) Provides more output per device for a given amount of distortion.
3) Core saturation of transformer is avoided.
4) Power supply hum is absent in the output.
Which of the above statements is/are correct for a push-pull amplifier?

Question 13

For the potential energy(U) vs position(x) function shown in fig. there will be an unstable equilibrium at position

Question 14

Direction : The question has Statement – 1 and Statement – 2. Of the four choices given after the statements, choose the one that describes the two statements.
Statement – 1 :A metallic surface is irradiated by a monochromatic light of frequency v > v₀ (the threshold frequency). The maximum kinetic energy and the stopping potential are K_max and V₀ respectively. If the frequency incident on the surface is doubled, both the K_max and V₀ are also doubled.
Statement – 2 : The maximum kinetic energy and the stopping potential of photoelectrons emitted from a surface are linearly dependent on the frequency of incident light.

Question 15

The band gap of Silicon at room temperature is:

Question 16

The primary reason for the widespread use of Silicon in semiconductor device technology is

Question 17

are non-coplanar vectors and λ is a real number, then the vectors

and

are non-coplanar for

Question 18

Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house is

Question 19

The equation x + e^x = 0 has

Question 20

For the hyperbola

, which of the following remains constant when α varies?

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Common Engg Exams Applied Mathematics Applied Physics Electronics Devices and Circuits Digital Techniques

May 17Common Engg Exams