SSC JE electrical Mock Test Paper 2019| MES Electrical

Ques.41. Find the voltage across it if the strength of the current in 1 H inductor changes at the rate of 5 A / sec?

1. 2 V
2. 5 V
3. 8 V
4. 10 V

Show Explanation

Ques.42.A dc series motor with resistance between terminals of 1 Ω, runs at 800 rpm from a 200 V supply taking 15A. if the speed is to be reduced to 475 rpm for the same supply voltage and current the additional series resistance to be inserted would be approximately

1. 2.5 Ω
2. 3Ω
3. 4.5 Ω
4. 5Ω

Show Explanation

Ques.43.Consider the following :

In a parallel plate capacitor, let the charge be held constant while the dielectric material is replaced by a different material, consider
1. Stored energy
2. electric field intensity
3. Capacitance
Which of these changes?

1. 1 only
2. 1 and 2 only 
3. 2 and 3 only
4. 1, 2 and 3

Show Explanation

Ques.44. Consider the following statements with regard to Lissajous Patterns on a CRO:
1) It is a stationary pattern on the CRO.
2) It is used for precise measurement of the frequency of a voltage signal.
3) The ratio between frequencies of vertical and longitudinal voltage signals should be an integer to have steady Lissajous Patterns.

Which of the above statements is/are correct?

1. 1 only
2. 1 and 2 only 
3. 2 and 3 only
4. 1, 2 and 3

Show Explanation

Ques.45. A dc series motor is running at rated speed and rated voltage, feeding a constant power load. If the speed has to be reduced to 0.25 p.u., the supply voltage should be reduced to

1. 0.7 pu
2. 0.25 pu
3. 0.5 pu
4. 1 pu

Show Explanation

Ques.46. In RLC series circuit if the Q factor is 1, then the damping of the system is?

1. Critical damped
2. Overdamped
3. Underdamped
4. Undamped

Show Explanation

Ques.47. Equipotential surface about a point charge is in which one of the following forms?

1. Square
2. Rectangle
3. Cube
4. Sphere

Show Explanation

Ques.48.  A 1 mA, 50Ω Galvanometer is required to measure 5 Amp (full scale). Find out the value of resistance to be added, across (shunt) the Galvanometer to accomplish this measurement.

1. 1 Ω
2. 10 Ω
3. 50 Ω
4. 0.01 Ω

Show Explanation

Ques.49. Which is correct for insulators in overhead lines?
i. low insulating resistance
ii. high relative permittivity
iii. low puncher strength
iv. partly filled impurities

1. 1 only
2.  2 only 
3.  3 only
4. 1, 2, 3 & 4

Show Explanation

Ques.50. An OP-AMP has a common mode gain of 0.01 and a differential mode gain of 10⁵. Its common mode rejection ratio would be

1. 10⁻⁷
2. 10⁻³
3. 10³
4. 10⁷

Show Explanation