GTU Elements of Electrical Engineering - December 2014 Exam Question Paper

GTU First Year Engineering (Semester 1)
Elements of Electrical Engineering
December 2014

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer the given MCQ.

1 (a) 1 The electrical force or pressure that causes the electrons to move in a particular direction is called as the __________________.
(A) Magneto motive force (
B) Electromotive force (
C) Electrostatic force (
D) Electromagnetic force

1 M

1 (a) 2 The charge on each electron is _____________ coulomb.
(A) 1.9 × 10-19 (
B) 1.6 × 10-19 (
C) 1.9 × 10-16 (
D) 1.6× 10-16

1 M

1 (a) 3 The unit of resistivity is ____________________
(A)Ω (
B) Ω-m (
C) m/Ω (
D) Ω-m -1

1 M

1 (a) 4 Coulomb's Second Law is called as _______________ law.
(A) Inverse square (
B) Charge (
C) Induction

1 M

1 (a) 5 The magnetic lines of force are known as lines of ___________________
(A) magnetic flux (
B) Electromagnetism (
C) Magnetic field

1 M

1 (a) 6 Magnetic flux density is measured in _____________
(A) wb (
B) m² /wb (
C) wb/m² (
D) Tesla/m²

1 M

1 (a) 7 The correct relation between the three permeability is ________________
(A) μ=μ₀ μ (
B) μ₀=μ μ_r (
C) μ=μ₀ μ_r (
D) μ=μ/μ₀

1 M

Answer the given MCQ.

1 (b) 1 Multimeter can be used to measure
(a) current (b) voltage (c) resistance (d) all of the above

1 M

1 (b) 2 Measuring range of voltmeter can be extended by using
(a) high shunt resistance (b) high series resistance (c) low shunt resistance (d)low series resistance

1 M

1 (b) 3 Full name of ELCB is
(a) Earth leakage circuit breaker (b) Earth less circuit breaker (c ) Earth loser circuit breaker
(d)Earth leakage circuit broker

1 M

1 (b) 4 Ammeter always connected is ________ in a circuit.
(a) Parallel (b) series (c) both (a) & (b)
(d)none of the above

1 M

1 (b) 5 Which of the following insulation is used in cables?
(a) Rubber (b) Paper (c) Porcelain (d) any of the above

1 M

1 (b) 6 Blinking of a fluorescent tube may be due to
(a) low circuit voltage (b) low ballast rating (c) low temperature (d) any of the above

1 M

1 (b) 7 The LED is usually made of materials like
(a) GaAs (b) C and Si (c) GeAs (d) None of the above

1 M

1 (c) 1 An alternating quantity is defined as the one which changes its _____________ as well as__________ with respect to time.
A) Value, direction (
B) Phase, polarity (
C) Value, phase

1 M

1 (c) 2 The AC voltage generators are called as ______________
(A) Alternator (
B) Induction generators (
C) alternating generator

1 M

1 (c) 3 The maximum value of an AC quantity is called as its ________________
(A) Amplitude (
B) Peak to peak value (
C) RMS value

1 M

1 (c) 4 RMS value is also called as __________________ of AC current
(A) Light producing component (
B) heat producing component (
C) Useful component (
D) Useless component

1 M

1 (c) 5 Peak value of sinusoidal waveform is equal to __________________
(A) 0.637 × V_average (
B) 0.637 V_rms (
C) 0.707 V_rms (
D) 1.414 V_rms

1 M

1 (c) 6 Filament material used in fluorescent tube is made up of_________________
(A) Nicron (
B) copper (
C) tungsten (
D) aluminium

1 M

1 (c) 7 Complete the following formula: 1 radian =_________________degrees
(A) π/180 (
B) 180/π (
C) π/360 (
D) 360/π

1 M

2 (a) State and explain Kirchhoff's laws.

3 M

2 (b) Derive and obtain the expression for temperature co efficient of resistance.
α₂=1/(1/α₁+(t₂-t₁))

4 M

2 (c) The resistance of a coil embedded in a large transformer is 12 Ω at 25°C after the transformer has been in operation for several hours, the resister of the coil found to be 13.4Ω. Find the Temperature the transformer core. Take α₂₀ = 0.00393°C^-1

7 M

3 (a) Compare series and parallel resonance.

3 M

3 (b) Compare the following term with respect to AC waveform.
(1)Power factor (2) Average value (3) R.M.S value (4) Form factor

4 M

3 (c) A Series RLC circuit consists of resistance of 500 ?, inductance of 50mHand a capacitance Of 20pF.
Find
(1) the resonant frequency
(2) The Q factor of the circuit of resonance
(3) The half power frequency

7 M

4 (a) State Coulomb's law of electrostatics

3 M

4 (b) Give similarities and dissimilarities between electrical circuit and magnetic circuit.

4 M

4 (c) Obtain the relation L=(L₁L₂-M₂) / (L₁+L₂+M₂) for equivalent inductance when two inductors are connected in parallel such that the mutual induced emf opposes the self induced emf.

7 M

5 (a) Explain magnetic hysteresis.

3 M

5 (b) State and explain Faraday's law of electromagnetic induction

4 M

5 (c) Find resistance between terminals AB of network shown in figure. 1 using star-delta transformation

7 M

6 (a) Explain how AC sinusoidal emf is generated?

3 M

6 (b) Derive equation for energy stored in capacitor.

4 M

6 (c) Explain in brief power measurement using two wattmeter method in 3-phase system with star connected load?

7 M

7 (a) List the different types of illumination scheme

3 M

7 (b) Define cable and explain its construction with neat sketch diagram

4 M

7 (c) List the different types of lamp and explain florescent lamps with wiring diagram

7 M

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