Hi students, Welcome to **Amans Maths Blogs (AMBIPi)**. Are you preparing for **SSC Scientific Assistant** and looking for * SSC Scientific Assistant Electronics Questions 21 to 40 with Answer Keys*? In this article, you will get previous year questions of SSC Scientific Assistant IMD (Indian Meteorological Department), which helps you in the preparation of government job of SSC IMD Scientific assistant.

## SSC Scientific Assistant IMD Previous Year Questions

**SSC Scientific Assistant Electronics Question No: 21**

Which of the following has the equal root mean square voltage and peak voltage ?

**Option A** : Saw tooth wave

**Option B** : Sinusoidal wave

**Option C** : Square wane

**Option D** : Triangular wave

**Show/Hide Answer Key**

**Option C : Square Wave**

**SSC Scientific Assistant Electronics Question No: 22**

If a resistive wave is load is supplied by a source in which the voltage and the current both have frequency of 110 Hz, the frequency of instantaneous power is ______.

**Option A** : 50 Hz

**Option B** : 55 Hz

**Option C** : 110 Hz

**Option D** : 220 Hz

**Show/Hide Answer Key**

**Option A : 220 Hz**

**SSC Scientific Assistant Electronics Question No: 23**

Determine the current through 2 Ohms resistance in the following circuit ?

**Option A** : 2 A

**Option B** : 2.5 A

**Option C** : 3 A

**Option D** : 3.5 A

**Show/Hide Answer Key**

**Option B : 2.5 A**

**SSC Scientific Assistant Electronics Question No: 24**

The Northern theorem reduces a circuit to which of the following circuits ?

**Option A** : A current source only

**Option B** : A current source with an impedance with parallel

**Option C** : A current source with an impedance series

**Option D** : A voltage source only

**Show/Hide Answer Key**

**Option B : A current source with an impedance parallel **

**SSC Scientific Assistant Electronics Question Paper No: 25**

Calculate the Thevenin’s equivalent voltage (in V) between A and B when all the resistances are in Ohms.

**Option A** : 1.5

**Option B** : 3

**Option C** : 4.5

**Option D** : 6

**Show/Hide Answer Key**

**Option D : 6**

**SSC Scientific Assistant Electronics Question No: 26**

What is the amount of charge stored (in C) in a capacitor having capacitance of 0.0008 F and a voltage of .16 V applied across it ?

**Option A** : 0.0005

**Option B** : 0.0008

**Option C** : 0.64

**Option D** : 0.128

**Show/Hide Answer Key**

**Option D : 0.128**

**SSC Scientific Assistant Electronics Question No: 27**

What is the approximate value of the capacitance ( in Farad) of earth if ( radius = 64,00 km )?

**Option A** : 0.000007

**Option B** : 0.000007

**Option C** : 0.00007

**Option D** : 0.0007

**Show/Hide Answer Key**

**Option C : 0.00007**

**SSC Scientific Assistant Electronics Question Paper No: 28**

What is the power dissipation (in W) in an ideal inductor having an inductance of 0.2 H ?

**Option A** : – 0.04

**Option B** : – 0.2

**Option C** : 0

**Option D** : 0.04

**Show/Hide Answer Key**

**Option C : 0**

**SSC Scientific Assistant Electronics Paper No: 29**

Calculate the peak value of the source voltage (in V). If the root mean square voltage across the resistor and inductor in a series RL circuit 13 V and 12 V, respectively.

**Option A** : 1

**Option B** : 17.68

**Option C** : 25

**Option D** : 35.35

**Show/Hide Answer Key**

**Option D : 35.35**

**SSC Scientific Assistant Electronics Previous Year Question: 30**

Calculate the admittance (in Siemens) of a series RC circuit having resistance of 15 Ohms and capacitance of 0.1 mF which is supplied by a source having frequency of 50 Hz.

**Option A** : 0.03

**Option B** : 0.3

**Option C** : 30

**Option D** : 3

**Show/Hide Answer Key**

**Option B : 0.3**

**SSC Scientific Assistant Electronics Question No: 31**

Calculate the power factor of the series RL circuit having the conductance of 30 Siemens and the Susceptance of Siemens.

**Option A** : 0.2

**Option B** : 0.4

**Option C** : 0.6

**Option D** : 0.8

**Show/Hide Answer Key**

**Option C : 0.6**

**SSC Scientific Assistant Electronics Question No: 32**

Which of the following is “TRUE” in case of the admittance of a circuit ?

**Option A** : It is the measure of flow of current which is allowed by circuit

**Option B** : It is measure of voltage supplied to the circuit

**Option C** : It is the measure of resistance offered by the circuit

**Option D** : It is the measure of the power dissipated in the circuit

**Show/Hide Answer Key**

**Option A : It is the measure of flow of current which is allowed by circuit**

**SSC Scientific Assistant Electronics Question No: 33**

In the following circuit, calculate the value of resistance R3 (in Ohms ) in the star circuit if the equivalent delta circuit has resistance values in ohms.

**Option A** : 1

**Option B** : 2

**Option C** : 3

**Option D** : 4

**Show/Hide Answer Key**

**Option B : 2**

**SSC Scientific Assistant Electronics Question No: 34**

What is the quality factor of a series RLC circuit having resistance, capacitance and inductance of 10 ohms, 90 mH and 0.1 mF respectively ?

**Option A** : 0.3

**Option B** : 0.9

**Option C** : 3

**Option D** : 9

**Show/Hide Answer Key**

**Option C : 3**

**SSC Scientific Assistant Electronics Question Paper No: 35**

Calculate the resonant frequency (in radians / sec) of a series RLC circuit having resistance of 15 Ohms and inductance of 25 mH.

**Option A** : 159.155

**Option B** : 318.31

**Option C** : 636.62

**Option D** : 1273.24

**Show/Hide Answer Key**

**Option B : 318.31**

**SSC IMD Scientific Assistant Previous Year Paper Question No: 36**

A star connected network consumes 1.8 kW at 0.05 lagging power factor when connected to a 230 V, 50 hZ source. Calculate the per phase impedance (in Ohms) of the star network .

**Option A** : 2.8

**Option B** : 3.6

**Option C** : 7.4

**Option D** :14.7

**Show/Hide Answer Key**

**Option D : 14.7**

**SSC Scientific Assistant Electronics Question No: 37**

A delta connected load has phase current of 5 A and has equal phase impedance of (12 + j5) Ohms. Calculate the value of line voltage (in Volts) supplying a delta connected load.

**Option A** : 112.58

**Option B** : 200

**Option C** : 220

**Option D** : 225.16

**Show/Hide Answer Key**

**Option A : 112.58**

**SSC Scientific Assistant Electronics Question Paper No: 38**

If a star network has 3 equal resistance of 80 Ohms, calculate the equivalent delta network resistance, (in Ohms) in each phase ?

**Option A** : 26.67

**Option B** : 80

**Option C** : 160

**Option D** : 240

**Show/Hide Answer Key**

**Option D : 240**

**SSC Scientific Assistant Electronics Paper No: 39**

Which of the following values must be same for the balanced three phase circuit ?

I Impedance

II Resistance

III Reactance

IV Power Factor

**Option A** : Only (I)

**Option B** : Only (II)

**Option C** : Only (III) and (IV)

**Option D** : (I) , (II) , (III) , (IV)

**Show/Hide Answer Key**

**Option D : (I) , (II) , (III) , (IV)**

**SSC Scientific Assistant Electronics Previous Year Question: 40**

Which of the following Boolean expression expresses the logic condition if “A = 1 and B = 0 or A = 0 and B = 1, only than the output Y = 0”?

**Option A** : Y = AB + BA

**Option B** : Y = AB + BA

**Option C** : Y = AB + AB

**Option D** : Y = AB + BA

**Show/Hide Answer Key**

**Option A : Y = AB + BA**

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