Fundamentals Of Nanoscience Set 10

Electrical Engineering,

Chemical Engineering

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This set of Fundamentals of NanoScience Multiple Choice Questions & Answers (MCQs) focuses on Fundamentals Of Nanoscience Set 10

Q1 | Calculate the line voltage in star connection when phase voltage=311 V.
  • 548.29 v
  • 538.66 v
  • 587.28 v
  • 185.58 v
Answer: 538.66 v
Explaination:
the line voltage in case of star connection is 1.73 times of phase voltage. it leads the phase voltage by an angle of 30°. vl-l
Q2 | The slope of the V-I curve of a solar cell is 66.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
  • 3.5 Ω
  • 2.2 Ω
  • 2.5 Ω
  • 2.9 Ω
Answer: 2.2 Ω
Explaination:
the slope of the v-i curve of a solar cell is resistance. the slope given is 66.1° so r=tan(66.1°)=2.2 Ω. the slope of the i-v curve is reciprocal of resistance.
Q3 | SCIM has a                    
  • shorter life
  • medium life
  • longer life
  • infinite life
Answer: longer life
Explaination:
scim stands for squirrel cage induction motor. it has high efficiency,
Q4 | Calculate the active power in a 11710 H inductor.
  • 8245 w
  • 1781 w
  • 0 w
  • 1964 w
Answer: 0 w
Explaination:
the inductor is a linear element. it only absorbs reactive power and stores it in the form of oscillating energy. the voltage and current are 90° in phase in case of the inductor so the angle between v & i is 90°. p = vicos90° = 0 w.
Q5 | Full form of CEL is                          
  • central electronics limited
  • central electrical limited
  • circle electronics limited
  • circle electrical limited
Answer: central electronics limited
Explaination:
the full form of cel is central
Q6 | Full form of BEL is                          
  • busy electronics limited
  • burden electrical limited
  • bharat electronics limited
  • brahma electrical limited
Answer: bharat electronics limited
Explaination:
the full form of bel is bharat electronics limited. it is a government of india enterprise founded in 1954. it is a publicly listed company.
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