NHPC-JE’21 EE: Daily Practices Quiz 26-NOV-2021

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NHPC-JE’21 EE: Daily Practices Quiz

NHPC-JE’21 EE: Daily Practices Quiz 26-NOV-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 06 min.

Q1. In 132 KV system the phase to ground capacitance is 6 µF and the inductance is 6 H. the value of the resistance to be used across the contacts of a circuit breaker to eliminate restriking voltage is
(a) 0.5 KΩ
(b) 1 KΩ
(c) 1.5 KΩ
(d) 2 KΩ

Q2. If the load on an induction motor is increased from no-load to full load, its slip and power factor will, respectively.
(a) Decrease, decrease
(b) Increase, increase
(c) Decrease, increase
(d) Increase, decrease

Q3. What is the main drawback of paper as an insulating material?
(a) Has poor dielectric strength
(b) Has low insulation resistivity
(c) Has high capacitance
(d) It is hygroscopic

Q4. The unit of luminous flux is:
(a) Candela
(b) Lumen
(c) Weber
(d) Lux

Q5. The annual depreciation of a hydro power plant is about……..
(a) 0.5% to 1.5%
(b) 10% to 15%
(c) 15% to 20%
(d) 20% to 25%

Q6. Depreciation charges are high in case of
(a) Hydroelectric power plant
(b) Wind power plant
(c) Diesel plant
(d) Thermal plant

SOLUTIONS

S1. Ans.(a)
Sol. R=0.5√(L/C)=0.5×√(6/(6×10^(-6) ))=0.5×10^3 Ω=0.5 KΩ.

S2. Ans.(b)
Sol. slip(s)=(N_s-N_r)/N_s
If the load on an induction motor is increased, the rotor speed will decrease and consequently slip and power factor will increase.

S3. Ans.(d)
Sol. The only disadvantage is that paper is hygroscopic and even if it is impregnated with suitable compound, it absorbs moisture and thus lowers the insulation resistance of the cable.

S4. Ans.(b)
Sol. The SI unit of luminous flux is the lumen.

S5. Ans.(a)

Sol.

The annual depreciation of hydro power plant is so less because of free cost fuel (water) and less maintenance of plant.

S6. Ans.(d)

Sol.

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