Lap winding is preferred for

SSC JE Electrical 2018 with solution SET-1
Lap winding is preferred for

High current and High Voltage

Low current and High Voltage

Low current and Low Voltage

High current and Low Voltage

High current and High Voltage

Low current and High Voltage

Low current and Low Voltage

High current and Low Voltage

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SSC JE Electrical 2018 with solution SET-1
A resistance of 75 Ohms is connected in the shunt of the galvanometer, having an internal resistance of 25 ohms, to convert it into an ammeter. What is the value of current (in A) flowing through the galvanometer, if the total current in the circuit is 5 A?

2.5

3.65

2

3.75

2.5

3.65

2

3.75

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SSC JE Electrical 2018 with solution SET-1
The air preheater in a thermal power plant is called as

Safety Device

Very essential Device

Efficiency increasing equipment

Starting Device

Safety Device

Very essential Device

Efficiency increasing equipment

Starting Device

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SSC JE Electrical 2018 with solution SET-1
Which one of the following is a passive element to an electric circuit?

Resistors

Battery

Voltage source

Current source

Resistors

Battery

Voltage source

Current source

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SSC JE Electrical 2018 with solution SET-1
If the field of a DC shunt motor gets opened while the motor is running, then the

Armature current will drop

Motor will become slow

Armature will oscillate about original speed as the mean speed

The motor will attain the dangerously high speed

Armature current will drop

Motor will become slow

Armature will oscillate about original speed as the mean speed

The motor will attain the dangerously high speed

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SSC JE Electrical 2018 with solution SET-1
Which of the following is a static exciter?

DC Separately excited generator

Amplidyne

Metadyne

Rectifier

DC Separately excited generator

Amplidyne

Metadyne

Rectifier

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An AC or DC generator requires direct current to energize its magnetic field. The DC field current is obtained from a separate source called an exciter. Either rotating or static-type exciters are used for AC power generation systems. There are two types of rotating exciters: brush and brushless. The primary difference between brush and brushless exciters is the method used to transfer DC exciting current to the generator fields. Static excitation for the generator fields is provided in several forms including field-flash voltage from storage batteries and voltage from a system of solid-state components. DC generators are either separately excited or self-excited.
EXCITATION SYSTEMS in current use include direct-connected or gear-connected shaft-driven DC generators, belt-driven or separate prime mover or motor-driven DC generators, and DC supplied through static rectifiers.
Static Excitation System
As the name indicates, all the components in this type of excitation system are static. A set of rectifiers is fed from a transformer that steps down the main generator or auxiliary bus voltage. The rectifiers supply the main generator excitation current directly through slip rings and they may be controlled or uncontrolled.

An external source of DC is necessary for the initial excitation of the field windings. On engine-driven generators, the initial excitation may be obtained from the storage batteries used to start the engine or from control voltage at the switchgear.
The main advantage of the static exciter is improved response as the field current is controlled directly by the thyristor rectifier but, of course, if the generator terminal voltage is depressed too low then excitation power will be lost. It is again possible to provide the power supply from both voltage and current transformers at the generator terminals but it is doubtful whether the improved response of the static exciter over a permanent magnet brushless scheme can be justified for many small embedded generators.

SSC JE Electrical 2018 with solution SET-1

SSC JE Electrical 2018 with solution SET-1 Lap winding is preferred for

SSC JE Electrical 2018 with solution SET-1 The air preheater in a thermal power plant is called as

SSC JE Electrical 2018 with solution SET-1 Which one of the following is a passive element to an electric circuit?

SSC JE Electrical 2018 with solution SET-1 If the field of a DC shunt motor gets opened while the motor is running, then the

SSC JE Electrical 2018 with solution SET-1 Which of the following is a static exciter?

SSC JE Electrical 2018 with solution SET-1
Lap winding is preferred for

SSC JE Electrical 2018 with solution SET-1
The air preheater in a thermal power plant is called as

SSC JE Electrical 2018 with solution SET-1
Which one of the following is a passive element to an electric circuit?

SSC JE Electrical 2018 with solution SET-1
If the field of a DC shunt motor gets opened while the motor is running, then the

SSC JE Electrical 2018 with solution SET-1
Which of the following is a static exciter?