ECET EEE 2009-8

1. The advantages of ring main system is

A. Greater stability
B. Serious voltage variation
C. Greater reliability of supply
D. Cuts off supply to the consumers

Answer : Greater reliability of supply
Explanation:-

2. In case of proximity effect, the effective Internal reactance of the conductor

A. Gets decreased
B. Gets increased
C. Never changes
D. Remains constant

Answer : Gets increased
Explanation:-

3. For a short Transmission line, the ABCD constants are

A. A = 1, B = Z, C = 0, D = 1
B. A = Z, B = 1, C = 1, D = Z
C. A = Z, B = 0 C = Z, D = Z
D. A = 1, B = Z, C = Z, D = Z

Answer : A = 1, B = Z, C = 0, D = 1
Explanation:-

4. For a line having negligible resistance and having no shunt leakage, the characteristic impedance is given by

A. Zc=√(L/C) is a pure inductance
B. Zc=√(C/L) is a pure capacitance
C. Zc=√(LC) is a pure inductance
D. Zc=√(L/C) is a pure resistance

Answer : Zc=√(L/C) is a pure resistance
Explanation:-

5. The following type of insulator is employed on locations where their is change indirection of the line

A. Strain type insulator
B. pin type insulator
C. Suspension type insulator
D. Cemented - cap type insulator

Answer : Strain type insulator
Explanation:-

6. The rain, sleet, or fog may

A. Reduce descriptive critical voltage E to 0.5 E
B. Increase descriptive critical voltage E to 1.5 E
C. Increase descriptive critical voltage to E to 1.2 E
D. Reduce descriptive critical voltage E to 0.8 E.

Answer : Increase descriptive critical voltage E to 1.5 E
Explanation:-

7. The concept of GMD is applicable for

A. Capacitance calculation
B. Inductance calculation
C. Resistance calculation
D. Impedance calculation

Answer : Inductance calculation
Explanation:-

8. Rheostatic braking may be applied to an induction motor provided

A. It is a wound type
B. It is a squirrel cage type
C. Separate DC source for field excitation is available
D. Variable external resistance is available

Answer : Separate DC source for field excitation is available
Explanation:-

9. During regenerative braking

A. The motors are disconnected form the supply
B. The motors are reverse connected to supply
C. The motors are operated as generators
D. The motors are made to come to standstill

Answer : The motors are operated as generators
Explanation:-

10. In high frequency eddy current heating, the following plays the major part

A. Ferranti effect
B. Skin effect
C. Hall effect
D. Pinch effect

Answer : Skin effect
Explanation:-