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SSC JE Electrical 2019 with solution SET-2

SSC JE Electrical 2019 with solution SET-2
In electric traction, the specific energy consumption is measured in

Watt-hour/ ton-km
Watt-hour/RPM
RPM/watt-hour
Ton-km watt-hour

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SSC JE Electrical 2019 with solution SET-2
If a zero-centered voltmeter has a scale from  5V to − 5V, then the span of it is

5 V
−5 V
10V
0 V

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Voltage Scale Span of  instrument = Vmax − Vmin
Given
Vmax = 5 V
Vmin = −5V
Span = 5 −(−5) = 10 V
 

SSC JE Electrical 2019 with solution SET-2
Which of the following is an important feature of a 3-phase synchronous motor?

Low starting torque
High starting torque
No starting torque
Low starting current

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Synchronous motors are not self-starting. The DC source is applied to the rotor of the synchronous Motor.

SSC JE Electrical 2019 with solution SET-2
Oxygen is a/an ____ gas?

Diamagnetic
Ferromagnetic
Inert
Paramagnetic

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Atoms or ions with unpaired electrons are attracted to a magnetic field; the more unpaired electrons, the greater is the attraction. Such substances are called paramagnetic. Molecular oxygen is a paramagnetic gas by virtue of its two unpaired electrons.
 

SSC JE Electrical 2019 with solution SET-2
The change in DC excitation of a synchronous motor will also change the

Supply voltage
Power factor
Speed of the motor
Load angle

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SSC JE Electrical 2019 with solution SET-2
In Boolean algebra (A. Ā) + A

A
1
Ā
0

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According to Boolean algebra law
A. Ā = A
A + A = A
Therefore in the given question
(A. Ā) + A = A + A = A
 

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