Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Electrical Engineering B-tech Electrical (ELECTRICAL MACHINES) - Question Paper

BSAE5/BSCH5/BSM5/BSET5/BSE5/BSCO5/BSMR5/BSMI5/BSMT5 – ELECTRICAL MACHINES
TIME : three HRS Maximum Marks :75

Instructions:
1. Question paper is divided into Group A, Group B, and Group C
2. Each Group is of 25 marks.
3. Figure to the right in bracket indicate Marks.
4. Good Handwriting is expected.
Group– A (25 Marks)
ans any 3 ques. : ( ques. one is compulsory )

1. Explain the structure of atom concept with neat diagram. (5)
2. Explain the construction details of DC Machine with neat diagram. (10)
3 Discuss the thevenin’s theorem & describe the reciprocity theorem ? (10)
4 Discuss the working principle of alternator what is the constructional details of a synchronoõs machine. (10)
3. Explain the EMF formula of alternator. (10)

Group – B (25 Marks)

ans any 3 ques. : ( ques. six is compulsory )

6. Determine the current distribution in every branch for the circuit. (5)








7. Use loop current analysis to obtain the currents in the various branches. (10)








8. Calculate the capacitance of the metal plates of are four m2 and separated by a dielectric of 3mm thick and of relative permittivity 6. If the electric field strength in the dielectric is 600 v/m. compute the total charge on every plate. (10)
9. Derive the EMF formula of DC Machine. (10)




10. Use super position theorem to obtain the current in various branches of the circuit.










(10)
Group– C (25 Marks)

Q. 11 (A) Fill in the Blanks ( every ques. carries two marks, Total= 10 marks)

1. One charge is equal to _______________ electrons.
2. The operation of electrical generator is based on the principle of _____________.
3. The operation of transformer is based on the principle of ___________________.
4. The shape of the commutator is ________________ .
5. The relative permittivity of mica is _______________ .

(B) Multiple option ques. (Each ques. carries two marks, Total= 10 marks)
1. Unit of capacitor is
a) Hentry b) Farad
c) Ohm d) Mho
2. The electron in the outer most orbit is
a) Free electron b) Valence electrons
c) Charge electrons d) Flow electrons
3. Auto transformer is
a) 2 winding transformer b) 1 winding transformer
c) 3 winding transformer d) 4 winding transformer
4. Transformer core is made of
a) Laminated sheets of silicon steel b) bronze
c) iron d) Nickel
5. AC current is found from
a) battery b) rectifier
c) dc generator d) ac generator
(C) Indicate whether subsequent statements are actual or False (Each ques. carries one marks, Total= five marks)

1. Damper winding is used to decrease the fluctuations in speed.
2. Induction meter used in Industries.
3. The conventional current flow is movement of positive charges.
4. Short circuit test is also called as no load test.
5. In loop current analysis formula are based on Faraday’s legal regulations.
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Earning:   Approval pending.