Related Questions

The secondary of a current transformer is always short-circuited under operating conditions because it
A avoids core saturation and high voltage induction
B is safe to human beings
C protects the primary circuit
D none of the above
When secondary of a current transformer is open-circuited its iron core will be
A hot because of heavy iron losses taking place in it due to high flux density
B hot because primary will carry heavy current
C cool as there is no secondary current
D none of above will happen
In triangle PQR length of the side QR is less than twice the length of the side PQ by 2 cm. Length of the side PR exceeds the length of the side PQ by 10 cm. The perimeter is 40 cm. the length of the smallest side of the triangle PQR is:
A 6 cm
B 8 cm
C 9 cm
D 10 cm
In a D.C. machine, short-circuited field coil will result in
A odour of barning insulation
B unbalanced magnetic pull producing vibrations
C reduction of generated voltage for which excitation has to be increased to maintain the voltage
D all above
In order to determine hfe and hie parameters of a transistor, ___________ is an a.c. short-circuited
A Input
B Output
C Input as well as output
D None of the above
Armature coil is short circuited by brushes when it lies
A Along neutral axis
B Along field axis
C In any of the above positions
D In none of the above positions
The ohmmeter reading for a short circuited capacitor is
A infinity
B few kilo ohms
C few megohms
D zero
If the capacitor of a single-phase motor is short-circuited
A the motor will not start
B the motor will run
C the motor will run in reverse direction
D the motor will run in the same direction at reduced r.p.m.
If the input capacitor of a transistor amplifier is short-circuited, then
A Transistor will be destroyed
B Biasing conditions will change
C Signal will not reach the base
D None of the above
In case one phase of a three-phase synchronous motor is short-circuited the motor will
A Not start
B Run at $$\frac{2}{3}$$ of synchronous speed
C Run with excessive vibrations
D Take less than the rated load

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