RRB JE electrical practice paper | RRB JE Electrical

Ques.81. What will be the penalty factor for the unit, if the generating station is located very close to the lower center

1. Zero
2. Almost equal to unity
3. The penalty factor is negative
4. The value is very high

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Ques.82. Which of the following curves represent, the incremental fuel rate curve

1. A
2. B
3. C
4. D

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Ques.83. The resistivity of copper is given as 0.67 micro-ohm per inch cube, calculate the value in micro-ohm per meter cube

1. 0.0173 µ Ω/m³
2. 0.0875 µ Ω/m³
3. 0.095 µ Ω/m³
4. 0.751 µ Ω/m³

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Ques.84. A solenoid 50 cm long and 10 cm in dia. is wound with 1500 turns find (i) the inductance and (ii) the energy stored in the magnetic field when a current of 8 A flows in the coil.

1. 0.035 H, 2.44 joules
2. 0.075 H, 3.44 Joules
3. 0.045 H, 1.44 Joules
4. 0.65 H, 4.44 Joules

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Ques.85. Which among the following are the stable discrete time system?

1. y(n) = x(4n)
2. y(n) = x(-n)
3. y(n) =ax(n) + 8
4. All of the above

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Ques.86. Which types of discrete-time system do/do not exhibit the necessity of any feedback?

1. Recursive system
2. Non-recursive System
3. Both (a) and (b)
4. None of these

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Ques.87. The torque/slip characteristics of inductance motor is shown, which is an unstable region

1. M
2. P
3. R
4. O

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Ques.88. Mercury as an electric current material is a

1. Liquid
2. Metal
3. Metal liquid
4. Gas

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Ques.89. For flat voltage profile system, voltage regulation is

1. 0%
2. 20%
3. 50%
4. 100%

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Ques.90.  The temperature coefficient of a thermistor is

1. Positive
2. Negative
3. Highly Negative
4. Highly Positive

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