Download GTU BE/B.Tech 2019 Summer 1st And 2nd Sem (New And SPFU) 2110005 Elements Of Electrical Engineering Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-I & II (NEW) EXAMINATION - SUMMER-2019

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Subject Code: 2110005 Date: 20/06/2019

Subject Name: Elements of Electrical Engineering

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Question No.1 is compulsory. Attempt any four out of remaining six questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 Objective Question Mark

(a) Answer the following multiple choice questions. 07

1. Which of the following relations is incorrect?
   

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   (a) P=V²/G (b) V=v(PR) (c) G=P/V² (d) I=v(P/R)
   P=power, V= Voltage, I= current, R=resistance, G=conductance
2. Ohm’s law is not applicable to
   (a) ac circuit (b) dc circuit (c) semi-conductor (d) linear circuits
3. Which of the following is a vector quantity?
   

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   (a) electric charge (b) electrical potential
   (c) electric field intensity (d) none of the above
4. Which law states that the induced e.m.f. and current always oppose the cause of producing them?
   (a) Lenz (b) Fleming (c) Faraday (d) Maxwell
5. Which of the following frequencies has the longest time period?
   

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   (a) 10 kHz (b) 1 kHz (c) 10 Hz (d) 1 Hz
6. The resonance frequency for the series RLC circuit where, R=100 O, L=80mH, C=3160 pF.
   (a) 15 kHz (b) 10 kHz (c) 8kHz (d) 12kHz
7. Series connection of cells
   (a) increases the efficiency (b) increases the voltage output
   

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   (c) increases the current output (d)decreases the internal resistance

(b) Answer the following 07

1. Give reason why are all equipments connected in parallel to the supply.
2. If resistance of each branch is 3 O in a delta connected load, what would be the resistance of each branch in star equivalent?
3. Give relationship between electric flux density and electric field intensity.

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4. What do you mean by capacitance? Give its unit.
5. State Fleming’s left hand rule.
6. Define rms value.
7. Differentiate between phase and line voltages in three phase circuits.

Q.2 (a) State and Explain Kirchhoff’s laws in context with DC circuits. 03

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(b) Calculate the current I through 25 O resistance in the circuit shown below if Input I1 of 5 mA is applied using a current source. 04

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