Related Questions

Which motor is normally free from mechanical and magnetic vibrations ?
A Split phase motor
B Universal motor
C Hysteresis motor
D Shaded pole motor
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
A Zero
B Small
C Large
D None of the above
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
A More than
B Less than
C Same as
D None of these
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.
A Equal to
B Directly proportional to
C Inversely proportional to
D Independent of
In a magnetic material hysteresis loss takes place primarily due to
A Rapid reversals of its magnetization
B Flux density lagging behind magnetizing force
C Molecular friction
D It high retentivity
Which one of the following statements best describes magnetic hysteresis?
A Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
B Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
C Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
D Hysteresis is most apparent when the core material is saturated
E None of the above
Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
The degree of mechanical vibrations produced by the laminations of a transformer depends on
A tightness of clamping
B gauge of laminations
C size of laminations
D all of the above
when workers o not find their assignments challenging. they become bored and , therefore , achiceve less than their potential .On the other hand, when workers ifind their assignments too difficult, they give up and so again achieve less than what they are capable of achieving . It is therefore, clear that no worker's full potential will ever be realized . Which one of the followings is an error of reasoning contained in the argument?
A Mistakenly equating what is actual and what is merely possible.
B ssuming without warrant that a situation allows only tow possibilities.
C Relying on subjective rather than objective evidence .
D Confusing the coincidence of two events with a causal relation between the two.
When workers do not find their assignments challenging, they become bored and, therefore, achieve less then their potential. On the other hand, when works find their assignments too difficult, they give up and so again achieve less than what they are capable of achieving. It is, therefore, clear that no worker’s full potential will even be realized. Which one of the following is an error of reasoning contained in the argument?
A Mistakenly equating what is actual and what is actual and what is merely possible.
B Assuming without warrant that a situation allows only two possibilities.
C Relying on subjective rather than objective evidence.
D Confusing the coincidence of two events with a causal relation between the two.

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