The motor used on a small lathe is usually

SSC JE Electrical 2018 with solution SET-1
The motor used on a small lathe is usually

Universal Motor

Single-phase capacitor run Motor

3-Phase Synchronous Motor

D.C shunt Motor

Universal Motor

Single-phase capacitor run Motor

3-Phase Synchronous Motor

D.C shunt Motor

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SSC JE Electrical 2018 with solution SET-1
Determine the magnetic field strength (in A/m) of a material when the intensity of magnetization of the material is 0.084 Amp/m and the magnetic susceptibility of the material is 0.0012

0.07

700

70

0.7

0.07

700

70

0.7

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SSC JE Electrical 2018 with solution SET-1
A house has 5 fans of 70 W each that operates for 16 hours a day and one washing machine of 2000 W that operates for 1 hours per day in the month of June. What is the energy consumption(in kWh) of the house in the month of June?

228

350

486.6

235.6

228

350

486.6

235.6

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SSC JE Electrical 2018 with solution SET-1
What is the value of current I4 (in A) for the given junction?

−4

6

−6

4

−4

6

−6

4

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SSC JE Electrical 2018 with solution SET-1
Which of the following is the CORRECT formula for permeance?

B/H

I/H

φ/Fm

Fm/L

B/H

I/H

φ/Fm

Fm/L

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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

Rectifier

Metadyne

DC Separately excited generator

Amplidyne

Rectifier

Metadyne

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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 The motor used on a small lathe is usually

SSC JE Electrical 2018 with solution SET-1 Determine the magnetic field strength (in A/m) of a material when the intensity of magnetization of the material is 0.084 Amp/m and the magnetic susceptibility of the material is 0.0012

SSC JE Electrical 2018 with solution SET-1 A house has 5 fans of 70 W each that operates for 16 hours a day and one washing machine of 2000 W that operates for 1 hours per day in the month of June. What is the energy consumption(in kWh) of the house in the month of June?

SSC JE Electrical 2018 with solution SET-1 What is the value of current I4 (in A) for the given junction?

SSC JE Electrical 2018 with solution SET-1 Which of the following is the CORRECT formula for permeance?

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

SSC JE Electrical 2018 with solution SET-1
The motor used on a small lathe is usually

SSC JE Electrical 2018 with solution SET-1
Determine the magnetic field strength (in A/m) of a material when the intensity of magnetization of the material is 0.084 Amp/m and the magnetic susceptibility of the material is 0.0012

SSC JE Electrical 2018 with solution SET-1
A house has 5 fans of 70 W each that operates for 16 hours a day and one washing machine of 2000 W that operates for 1 hours per day in the month of June. What is the energy consumption(in kWh) of the house in the month of June?

SSC JE Electrical 2018 with solution SET-1
What is the value of current I4 (in A) for the given junction?

SSC JE Electrical 2018 with solution SET-1
Which of the following is the CORRECT formula for permeance?

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