North Maharashtra University 2012 Diploma Computer Engineering MSBTEs Summer (Electrical Technology (12026)) - exam paper

12026
11122
3 Hours / 100 Marks Seat No.

Instructions - (1) All ques. are Compulsory.
(2) ans every next main ques. on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Figures to the right indicate full marks.
(5) presume suitable data, if necessary.
(6) Use of Non-programmable Electronic Pocket Calculator is permissible.
(7) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in exam Hall.
(8) Use of Steam tables, logarithmic, Molliers chart is permitted.

Marks

1. Attempt any TEN of the following: 20

a) describe resistance. State its units.

b) describe an active network.

c) describe power factor.

d) describe an impedance. State its unit.

e) State the relation ranging from time period and frequency.

f) State the power factor of pure capacitive circuit.

g) describe phase sequence in three phase a.c. system.

h) State different losses in transformer.

i) discuss isolation transformer in brief.

j) State any 4 applications of a stepper motor.

k) State Flemings Left Hand rule.

l) discuss the necessity of fuse in the circuit.

16
2. Attempt any 4 of the following:

a) State the formulae for conversion of star into delta and delta into equivalent star network.

b) describe ideal and practical voltage sources. Represent these sources.

c) describe bilateral and unilateral networks.

d) A resistor of eight ohm is connected in series with a combination of 12 ohm and 24 ohm in parallel. A 100 volt d.c. supply is connected across the combination. Determine.
(i) Equivalent resistance of the circuit,
(ii) Total current,
(iii) Voltage across eight ohm resistance and
(iv) Current through 120 ohm resistance.

e) State and discuss Kirchoffs voltage legal regulations.

f) Determine current through five ohm resistance using nodal analysis in Fig. No. 1.

3. Attempt any 4 of the following: 16

Earning:   Approval pending.