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Browse complete papersIdentify the correct equation for controlling torque (Tc) in a spring-controlled moving iron instrument, where K is the spring constant and θ is the deflection angle.
Tc = K + θ
TC = Kθ
TC = K - θ
TC = \(\frac{K}{θ}\)
Correct answer
Tc = K + θ
A Squirrel cage induction generator operates at __________ speed for electric generation in wind turbines.
variable
constant
slip
negligible
Correct answer
variable
A DC shunt motor is initially running at no load. What is the effect on its speed when the load is increased?
The speed remains constant
The speed increases slightly
The speed decreases slightly
The speed decreases significantly
Correct answer
The speed remains constant
Which of the following is the main purpose of earth resistance measurement?
Reduce frequency variation
Increase power output
Improve voltage level
Ensure safe dissipation of fault current
Correct answer
Reduce frequency variation
In a ring distribution system, what happens when there is a fault in one section?
The receiving end voltage becomes more than the sending end voltage.
The voltage drop increases significantly.
The entire system is shut down.
The power can be supplied through the alternate path.
Correct answer
The receiving end voltage becomes more than the sending end voltage.
How is the phase angle between voltage V and total current IS in a parallel RLC circuit determined?
From the angle between V and IR
By subtracting IL from IC
From the angle between V and the vector sum of IR, IL, and IC
By comparing voltage drops across each element
Correct answer
From the angle between V and IR
A machine delivers power that is three times its original value, while the duration of operation stays unchanged. How does the work done by the machine change?
It becomes three times larger.
It becomes nine times larger.
It becomes one-third of the original.
It remains unchanged.
Correct answer
It becomes three times larger.
If the frequency of an AC source is doubled, the impedance of a pure resistor ____________.
remains unchanged
halves
quadruples
doubles
Correct answer
remains unchanged
What is the main purpose of providing a properly installed earthing system in electrical installations?
To increase the insulation resistance of conductors
To reduce the reactance of the line conductors
To improve the power factor of the electrical system
To provide a safe path for leakage and fault currents to earth
Correct answer
To increase the insulation resistance of conductors
In the graphical analysis of a FET amplifier, what is the primary purpose of the load line?
To determine the input impedance of the FET
To determine the operating point of the FET
To determine the power gain of the FET
To determine the output impedance of the FET
Correct answer
To determine the input impedance of the FET