If a star connected system has equal impedances Z1, then after converting into delta connected system having equal impedances Z2, then?

Among the five stars, Star Z, Star Y, Star X, Star W, and Star V, Star W is brighter than Star Y and Star X. Star Z is dimmer than Star Y but brighter than Star X. Star V is brighter than Star Z but dimmer than Star Y. Which star is the second brightest?

A

Star X

B

Star Y

C

Star Z

D

Star W

In the question given below are two conclusions followed by five statements. You have to choose the correct set of statements that logically satisfies conclusions. Conclusions: I. Some Star are Moon II. Some Sun are not Mars Statements: I. Some Sun are Moon, Some Moon are star and No star is Mars. II. Some Sun are Moon, All Moon are Star and No Star is Mars. III. All Sun are Moon, All Moon are Star and Some Star are Mars. IV. All Sun are Moon, Some Moon are Star and No Star is Mars. V. Some Sun are Moon, Some Moon are Star and No Moon is Mars.

A

Both I and III are true

B

Only statement III is true

C

Only statement I is true

D

Both Statements II and V are true

E

Only statement V is true

Consider the following remarks pertaining to the irrotational flow: 1. The Laplace equation of stream function $\frac{{{\delta ^2}{\rm{\Psi }}}}{{\delta {x^2}}} + \frac{{{\delta ^2}{\rm{\Psi }}}}{{\delta {y^2}}} = 0$ must be satisfied for the flow to be potential. 2. The Laplace equation for the velocity potential $\frac{{{\delta ^2}{\rm{\varphi }}}}{{\delta {x^2}}} + \frac{{{\delta ^2}{\rm{\varphi }}}}{{\delta {y^2}}} = 0$ must be satisfied to fulfil the orate . of mass conservation i.e continuity equation.. Which of the above statements is/are correct?

A

1 only

B

Both 1 and 2

C

2 only

D

Neither 1 or 2

Apart from connection which of the following is different in star/delta or delta/star compare to delta/delta?

A

Flux is flat-topped

B

Impedance offered to third-harmonic currents in delta is less

C

Impedance offered to third-harmonic currents in delta is constant

D

Impedance offered to third-harmonic currents in delta is more

Three identical impedances (3 + j6) Ω are connected in delta to a three-phase, 50 Hz supply. What will be the equivalent star-connected impedance that draws the same current when connected to the same supply voltage?

A

(3 + j6) Ω

B

(6 + j12) Ω

C

(1.5 + j3) Ω

D

(1 + j2) Ω

Seven people A, B, C, D, E, F and G live on separate floors of a 7-floor building. Ground floor is numbered 1, first floor is numbered. 2 and so on until the topmost floor is numbered 7. Each one of these having a different cars-Cadillac, Ambassador, Fiat, Maruti, Mercedes, Bedford and Fargo but not necessarily in the same order. Only three people live above the floor on which A lives. Only one person lives between A and the one having a car Cadillac. F lives immediately below the one having a car Bedford. The one having a car Bedford lives on an even-numbered floor. Only three people live between the ones having a car Cadillac and Maruti. E lives immediately above C. E is not having a car Maruti. Only two people live between B and the one having a car Fargo. The one having a car Fargo lives below the floor on which B lives. The one having a car Fiat does not live immediately above D or immediately below B. D does not live immediately above or immediately below A. G does not have a car Ambassador. Question : How many people live between the floors on which D and the one having a car Bedford ?

A

One

B

Two

C

Three

D

Four

A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is _________

A

3

B

1/3

C

√3

D

1/√3

Two monochromatic waves having frequencies $$\omega $$ and $$\omega + \Delta \omega \left( {\Delta \omega \ll \omega } \right)$$ and corresponding wavelengths $$\lambda $$ and $$\lambda - \Delta \lambda \left( {\Delta \lambda \ll \lambda } \right)$$ of same polarization, travelling along X-axis are superimposed on each other. The phase velocity and group velocity of the resultant wave are respectively given by

A

$$\frac{{\omega \lambda }}{{2\pi }},\,\frac{{\Delta \omega {\lambda ^2}}}{{2\pi \Delta \lambda }}$$

B

$$\omega \lambda ,\,\frac{{\Delta \omega {\lambda ^2}}}{{\Delta \lambda }}$$

C

$$\frac{{\omega \Delta \lambda }}{{2\pi }},\,\frac{{\Delta \omega \Delta \lambda }}{{2\pi }}$$

D

$$\omega \Delta \lambda ,\,\omega \Delta \lambda $$

In the question below are given two statements followed by two conclusions numbered I and II. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: I. Only a few planet are star II. Some moon is not star Conclusions: I. Some star is not moon II. Some planet are not star

A

Only conclusion I follows

B

Only conclusion II follows

C

Both conclusion I and II follows

D

Either conclusion I or II follows

E

Neither conclusion I nor II follows

A

9

B

12

C

16

D

15

If a star connected system has equal impedances Z1, then after converting into delta connected system having equal impedances Z2, then?

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