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Utilization Electrical Energy UEE PSBTE Diploma Paper May 2008

  •   Utilization Electrical Energy UEE PSBTE Diploma Paper May 2008                                               SECTION-A

Q1. Do as directed.                                                                                                                      15×1=15

  1. For small domestic appliances Single Phase ac motors are used.                                
  2. The reversal of rotation of motor for electric braking is known as Regenerative Braking.                         
  3. The life of a filament lamp Decrease with the increase in operating voltage
  4. The sodium Vapour lamp produces Yellowwish light.
  5. Dielectric heating is used for heating of Insulating materials. 
  6. In resistance welding current is passed through Joint.
  7. The weight of substance liberated during electrolysis is proportional to the product of Current and Time.
  8. Vapour compression cycle has Four stages.
  9. In Kando system of track electrification, single-phase ac is converted into Three Phase ac.
  10. Seam welding is used for welding Sheets.

              SECTION-B

    Q2. Attempt any five questions.                                                                    5×6=30

     (i) What is multimotor drive ?

    (ii) What is meant by direct, indirect and semi-direct lighting ?

   (iii) Why the supply used for arc furnace is low voltage, high current one ?

   (iv) What is meant by anodizing ?

   (v) Differentiate between ac and dc welding. (vi) What is refrigration ? Why is it necessary to maintain constant voltage for the refrigerator.

   (vii) Why steam engine drive is not suitable for urban or sub urban railways ?

  (viii) Why local lighting is required in factory lighting ?

     SECTION-C

Q3. Attempt any three questions.                                                       3×10=30

   (i) Discuss with the help of a neat diagram, the construction and working of high pressure  vapour lamp. 

   (ii) Discuss the Ajax Wyatt (Vertical core) type induction furnace and explain its working.

  (iii) Explain briefly the different welding processes under resistance welding. Why is it necessary to use \’welding transformer’?

  (iv) Discuss the concept of plugging and regenerative braking. Describe the criteria for selection of motor for particular job.

  (v) Write short notes on :

  (a) What is electroplating?

  (b) What are the applications of vapour compression refrigerator cycle ?

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Section a FILL IN THE BLANKS be paper

N-type semiconductors are formed by adding ______ Impurity to a Pure Semiconductor

Pentavalent Impurity

In Intrinsic semiconductors number of electrons are  to number of
Conduction in P-type semiconductor is due to movement of _____.

Holes

Value of knee voltage for silicon diode is ____.

0.7 V

A Photodiode is optimized for its sensitivity to
Zener diode is made to operate in _____ Region

Zener Breakdown Region

A transistor contains______PN Junction

Two

The gain stability of an amplifier circuit can be improved by using ____.

Negative Feedback

The value of collector current of a transistor is ____ to emitter Current.

Always Less than

In transistor, leakage current mainly depends on _______.

Temperature

The ideal value of stability factor is ____.

one

FET is a _____ terminal semiconductor

Three

MOSFET stands for __________

Metal  Oxide Filed Effect Transister

When both the junctions of a transistor are forward biased, it is said to be in _______________ Region

Saturation Region

Basic Electronics PSBTE Diploma Solved Paper May 2017.Download Previous Year Basic Electronics 2nd Sem Semester ECE ,CSE Question Paper Solution Click Here

Section B : BE PAPER MAY 2018 PAPER

Explain Intrinsic and Extrinsic Semiconductor with Suitable Diagram ?

Intrinsic and Extrinsic Semi-conductor Click Here.

What is Zener diode? Draw its symbol and explain its characteristics.

What is Zener diode? Draw its symbol and characteristics 

Explain the Working of Half Wave Rectifier

Working of Half wave Rectifier click here

Explain the working of NPN Transistor ?

Working of NPN Transistor Click Here

Difference Between FET and BJT ?
h-Parameters (hybrid Parameter) of transistors ?

hybrid Parameter) of transistor

In what way the temperature variations affect the operating point of a transistor?

Temperature variations affect the operating point of a transistor 

Explain the Phase reversal of output voltage with respect to input voltage in an Amplifier ?

Phase reversal of output voltage with respect to input voltage in an Amplifier 

Basic Electronics PSBTE Diploma Solved Paper May 2017 Solution Click Here

BASIC ELECTRONICS DIPLOMA MAY 2018 PAPER


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