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ESE 2021 Technical Quiz || Full Revision Mock Test-7

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Question 1

In order to generate a square wave from a sinusoidal input signal, One can use
1) Schmitt trigger circuit
2) Clippers and amplifiers
3) Monostable multivirator
Which of the above statements are correct?

Question 2

There are five message signals generated by a source with probabilities . What is the average amount of uncertainty within source?

Question 3

V=A sin(wct + m.sin wmt) is the expression for

Question 4

In which one of the following classes of computers, is the relationship between architecture and organization very close?

Question 5

Statement (i): For radar tracking systems, signals are available in the form of pulse trains.
Statement (ii): The stability of a discrete-time system is decreased as the sampling period is shortened.

Question 6

Consider the following statements:
When all the elements in one row of the Routh’s tabulation are zero then this condition indicates:
1) one pair of real roots with opposite sign in s-plane
2) one pair of conjugate roots on the imaginary axis in s-plane
3) conjugate roots forming a quadrate in s-plane
Which of the statements given below is/are correct?

Question 7

The inductance of an air-cored coil is proportional to

1) The square of the number of turns.

2) The diameter of the coil.

3) A form factor, F, dependent on the ratio of coil radius to coil length plus winding depth.

Which of the above statements are correct?

Question 8

If the interaction between the atomic permanent dipole moment is zero or negligible and the individual dipole moments are oriented at random, the material will be a

Question 9

Direction: Each of the question consist of two statements, one labelled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer to these items using the codes given below:
Statement (I): Stability of a power system can be improved by using parallel transmission lines.
Statement (II): Two transmission lines in parallel will increase the impedance between sending end and receiving end compared to single line.

Question 10

A three phase 50 Hz, 11 kV and 37.5 MW at 0.9 p.f. capacity synchronous generator has its stator bore diameter of 765 cm and an axial core length of 80 cm. For which power plant this generator is suitable?

Question 11

If a sine wave A has (+) positive zero crossing at 25 ° and sine wave B has (+) positive zero crossing at 30 °, then which among the following is correct?

Question 12

An uncharged capacitor of 0.01 F is charged first by a current of 2 mA for 30 sec and then by a current of 4 mA for 30 sec. the final voltage in will be

Question 13

A voltage commutated chopper is gives below. The chopper duty ratio is 50%. The load current remains contact 10 A assuming the input voltage to be 190 V and device to be ideal. Maximum value of current through capacitor is

Question 14

A single phase full bridge inverter has a resistive load of 5Ω and dc input voltage of 50V.Find the average current in each transistor?

Question 15

A moving coil instrument of resistance 5Ω requires a potential difference of 75 mV to give a full scale deflection of 75 mV to give a full scale deflection. The value of shunt resistance needed to give a full scale deflection at 30 A is

Question 16

A dc voltmeter has a sensitivity of 1000 /V. When it measures half full scale in 100 V range, the current through the voltmeter is

Question 17

The observations of the marks scored by 100 students in a test are grouped as below:

The median of the marks is

Question 18

Which of the following statements are correct regarding uniform plane waves?

1) Uniform plane waves are transverse

2) The relation between E and H is

3) E × H gives the direction of the wave travel

4. For a uniform plane wave travelling in x direction, Ex = 0

Question 19

The zero-sequence impedance of a 3ϕ transformer is shown below. The connection of its winding are:

Question 20

A 20 MVA generator has inertia constant of 0.5 pu. Find new value for 100 MVA base.
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