Related Questions

A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A remain same
B go down
C improve
D none of the above
Which of the following is the disadvantage of static capacitor for power factor improvement ?
A Easily damaged by high voltage
B Cannot be repaired
C Short service life
D All of the above
The low power factor of induction motor is due to
A Rotor leakage reactance
B Stator reactance
C The reactive lagging magnetizing current necessary to generate the magnetic flux
D All of the above
The primary reason for low power factor is supply system is due to installation of
A induction motors
B synchronous motors
C single phase motors
D d.c. motors
Low power factor is usually not due to
A Arc lamps
B Induction motors
C Fluorescent tubes
D Incandescent lamp
A company produces five types of shirts -- A,B,C,D and E-using cloth of three qualities -- high, medium and low , using dyes of three qualities-- high, medium and low. One shirt requires 1.5 m of cloth .The following table gives respectively : The number of shirts (of each category) produced, in thousands. The percentage distribution of cloth quality in each type of shirt, and The percentage distribution of dye quality in each type of shirt. How many meters of low-quality cloth is consumed?
A 40,00 m
B 60,000 m
C 46,500 m
D 22,500 m
A company produces five types of shirts -- A,B,C,D and E-using cloth of three qualities -- high, medium and low , using dyes of three qualities-- high, medium and low. One shirt requires 1.5 m of cloth .The following table gives respectively : The number of shirts (of each category) produced, in thousands. The percentage distribution of cloth quality in each type of shirt, and The percentage distribution of dye quality in each type of shirt. What is the ratio of low quality dye used for C-type shirts to that used for D-type shirts ?
A 2:3
B 1:2
C 2:1
D 3:2
With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low.
A No change, set
B Race, high
C high, reset
D set, reset
E None of the above
If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
A will become more
B will become less
C will remain unchanged
D none of the above.
If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor
A become more
B become less
C remain constant
D none of the above

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