ECET EEE 2011-4

1. Mho relays have an R-X plane characteristics depicted by

A. a straight line passing through the origin
B. a straight line parallel to R-axis
C. a straight line parallel to X-axis
D. a circle passing through the origin

Answer : a circle passing through the origin
Explanation:-

2. Which one of the following is provided with arcing horns

A. air break switch
B. isolator
C. oil switch
D. lightening arrestor

Answer : lightening arrestor
Explanation:-

3. Insulators, that are used at the dead ends or the change the direction of the transmission line are

A. Pin type
B. Suspension type
C. strain type
D. shackle type

Answer : strain type
Explanation:-

4. The generalised constants A and D of the transmission line have

A. no dimensions
B. dimensions of ohm
C. dimensions of mho
D. dimensions of seimen

Answer : no dimensions
Explanation:-

5. In a string suspension insulation the maximum voltage appears across the

A. unit farthest to the conductor
B. unit in the middle of the string
C. unit nearest to the conductor
D. all units in the string

Answer : unit nearest to the conductor
Explanation:-

6. The most common system for secondary distribution of 400/230V is

A. 3phase,3wire
B. 3phase,4wire
C. DC,3wire
D. DC,2wire

Answer : 3phase,4wire
Explanation:-

7. If the length of a cable is doubled, then its capacitance is

A. remains same
B. halved
C. quadrupled
D. doubled

Answer : remains same
Explanation:-

8. For higher transmission voltages

A. transmission efficiency is less
B. voltage drop is high
C. conductor material required is less
D. power factor is high

Answer : conductor material required is less
Explanation:-

9. During ______ type of braking motors are reverse connected to supply

A. plugging
B. rheostatic braking
C. mechanical braking
D. regenerative braking

Answer : Plugging
Explanation:-

10. Ring main distribution system is preferred to a radial system, because

A. it is less expensive
B. voltage drop in the feeder is less
C. No stability problems
D. supply is more reliable

Answer : supply is more reliable
Explanation:-