# Basic Electrical Engineering BEE Dec 2011 Paper

### Duration : 3 Hrs                                                                                      M.Marks : 75                                                                     SECTION A

#### 1. Fill in the blanks :

1. The unit of magnetic flux density is  Weber per Square metre
2. If ‘n’ identical resistances are connected in series, their total value is K? when these are connected in parallel their effective value is  K/n
3. The resistance of a wire is 2?. If the diameter of wire is reduced to half, keeping the length same, then the resistance will be          .
4. The power factor of an A.C. circuit is equal to Real Power/Apparent Power.
5. Frequency of  DC voltage is Zero .
6. The unit of coefficient of coupling is No unit or Unitless
7. The unit of magnetic flux density is Weber per Square metre.
8. For battery charging supply is DC Supply.
9. If 18 resistances, each of 36W are connected in parallel, then effective resistive will be
10. The power drawn by pure inductance is Zero

## SECTION-B

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

1. Give the merits and demerits of nuclear power plant ?.
2. Define self and mutually induced emfs ?
3. Draw and explain Phasor diagram for the R-L series Circuit ?.
4. Explain hysteresis Loss ?.
5. What is constant current source and draw characteristics of an ideal current
6. A resistor of 100 W is connected in series with a 56 mF capacitor to a supply at 230 V, 50 Hz. Find the impedance, the current, the phase angle, the pf and the voltage across the resistor and the Capacitor ?
7. What do you mean by form factor and peak factor ?

## SECTION-C

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

1. Find the impedance, current and the power factor of the following series circuits  and draw the corresponding phasor diagram   (a) R and L                                  (b) R and C  In each case the applied voltage is 200 volt, the frequency is 50 Hz, R = 10 ohm,      L = 50 mH; C = 100 pF.

2. (a) What are the various precautions to be observed for obtaining longer life and batter efficiency of lead acid battery ?                                                                                  (b) Define flux, mmf, reluctance and permeability in magnetic circuits.

3.(a) Compare electric and magnetic What do you mean by power factor ? What is its importance.

(b) Discuss hydro power plant with the help of schematic Diagram ?

## BASIC ELectrical engineering bee dec 2011 DIPLOMA PAPER SOLUTION

### Section a FILL IN THE BLANKS bee dec 2011paper

The unit of magnetic flux density is  Weber per Square metre

If ‘n’ identical resistances are connected in series, their total value is K? when these are connected in parallel their effective value is  K/n

The resistance of a wire is 2?. If the diameter of wire is reduced to half, keeping the length same, then the resistance will be          .

The power factor of an A.C. circuit is equal to Real Power/Apparent Power.

Frequency of  DC voltage is Zero .

The unit of coefficient of coupling is No unit or Unitless

The unit of magnetic flux density is Weber per Square metre.

For battery charging supply is DC Supply.

If 18 resistances, each of 36W are connected in parallel, then effective resistive will be 9 Ohm

The power drawn by pure inductance is Zero

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