# BASIC ELECTRICAL ENGINEERING 2nd Exam/ECE/CS/6125/2561/0064/Dec’11

** SECTION-A**

**Q1. Do as directed.**** 15×1=15**

- The unit of magnetic flux density is weber/m2
- If ‘n’ identical resistances are connected in series, their total value is K? when these are connected in parallel their effective value is .
- 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 C. circuit is equal to _________
- Frequency of DC voltage is
__Zero__ - The unit of coefficient of coupling is
- The unit of magnetic flux density is
**weber/m2**. - For battery charging supply is
**+5v 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**

# SECTION-B

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

- Give the merits and demerits of nuclear power plant ?
- Define self and mutually induced emfs ?
- Draw and explain Phasor diagram for the R-L series Circuit ?
- Explain hysteresis loss ?
- What is constant current source and draw characteristics of an ideal current
- 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
- What do you mean by form factor and peak factor ?

# SECTION-C

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

**Q.3** 1.Find the impedance, current and the power factor of the following series circuits and draw the corresponding phasor diagram.

- R and L
- 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? F.

**Q.4**(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.

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

Discuss hydro power plant with the help of schematic

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### SECTION A :-BASIC ELECTRICAL ENGINEERING 2nd Exam/ECE/CSE /6125/2561/0064 /Dec’11

The unit of magnetic flux density is weber/m2

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 C. circuit is equal to _____

Frequency of DC voltage is __Zero__

The unit of coefficient of coupling is _______

The unit of magnetic flux density is **weber/m2**.

For battery charging supply is **+5v 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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### BASIC ELECTRICAL ENGINEERING 2nd Exam/ECE/CSE /6125/2561/0064 /Dec’11

merits and demerits of nuclear power plant

self and mutually induced emfs

Phasor diagram for the R-L series Circuit

hysteresis loss

constant current source

characteristics of an ideal current Source.

form factor and peak factor

#### BASIC ELECTRICAL ENGINEERING 2nd Exam/ECE/CSE/6125/2561/0064/Dec’11 Click Here

### Section c BASIC ELECTRICAL ENGINEERING 2nd Exam/ECE/CSE /6125/2561/0064 /Dec’11

Various precautions to be observed for obtaining longer life

flux, mmf, reluctance and permeability in magnetic circuits.

electric and magnetic

power factor

What is its importance.

hydro power plant with the help of schematic Diagram.