MGVCL EXAM PAPER (30-07-2021 SHIFT 2) QUIZ

The line currents in amperes in phases a, b and c respectively are 500 +j150, 100 – j600 and – 300 + j600 referred to the same reference vector with phase sequence of abc. Find the symmetrical component of currents.

Ia₀ = (100+j50) AIa₁ = (146.41+ j65.47) AIa₂ = (546.41-j165.47) A

Ia₀ = (100+j50) AIa₁ = (546.41+ j165.47) AIa₂ = (546.41-j165.47) A

Ia₀ = (100+j50) AIa₁ = (200+ j107.75) AIa₂ = (200-j107.75) A

Ia₀ = (100+j50) AIa₁ = (546.41+j165.47) AIa₂ = (-146.41-j65.47) A

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Which one of the following statement is TRUE?

In the cables, the location of fault is usually found out by comparing the capacitances of insulated conductors.

The current carrying capacity of cables in DC is less than that in AC.

Underground cables are laid at sufficient depth to avoid being unearthed easily due to removal of soil.

In the cables, sheaths are used to provide enough strength.

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In a 3-phase, 4-wire, 400/230 V system, a lamp (L1) of 100 W is connected to one phase and neutral and a lamp (L2) of 150 W is connected to the second pahse and neutral. If the neutral wire is disconnected accidently, then

100 W lamp (L1) becomes brighter and 150 W lamp (L2) becomes dim

both 100 W lamp (L1) and 150 W lamp (L2) becomes brighter

both 100 W lamp (L1) and 150 W lamp (L2) becomes dim

100 W lamp (L1) becomes dim and 150 W lamp (L2) becomes brighter

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Nangal Wildlife Sanctuary is located in which state?

Tamil Nadu

Mizoram

Punjab

Sikkim

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When different types of consumers are charged at different uniform per unit rates, it is called as ____

flat rate tariff

block rate tariff

two-part tariff

maximum demand tariff

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In transformer, a Sweep Frequency Response Analysis (SFRA) test will help detect ____

Moisture in the windings

Aging by-products

Age of the insulation

Movement / damage to internal components

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Magnetic tape is not practical for applications where data must be quickly recalled because tape is a/an____.

Sequential access medium

expensive storage medium

Random access medium

None of these

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In transformer, bushing failure occurs due to<br/>(i) transformer vibrations<br/>(ii) dielectric losses<br/>(ii) partial discharge

(i), (ii) and (iii)

(i) and (ii) only

(ii) and (iii) only

(i) and (iii) only

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In the circuit shown in figure, the voltage across 8 Ω resistor is 20 V. Calculate the supply voltage.

27 V

18 V

47 V

38 V

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A MOSFET rated for 15 A, carries a periodic current as shown in figure. The ON state resistance of the MOSFET is 0.15 Ω. The average ON state loss in the MOSFET is

7.5 W

3.8 W

33.8 W

15 W

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