Related Questions

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
In a certain population group, 57% of the people have characteristics, X and 63% have characteristics Y. If every person in the group has at lest what percent of the people have both X and Y?
A 20%
B 18%
C 12%
D 6%
Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?
A Swinburne's test
B Hopkinson's test
C Field test
D Brake test
In case of conductively compensated D.C. series motors, the compensating winding is provided
A As separately wound unit
B In parallel with armature winding
C In series with armature winding
D In parallel with field winding
When two D.C. series motors are connected in parallel, the resultant speed is
A More than the normal speed
B Loss than the normal speed
C Normal speed
D Zero
During rheostatic braking of D.C. series motors
A Motor is run as a generator
B Motor is reversed in direction
C Motor is run at reduced speed
D None of these
D.C. series motors are used
A Where load is constant
B Where load changes frequently
C Where constant operating speed is needed
D In none of the above situations
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
A improve power factor
B increase overload capacity
C reduce fluctuations in torque
D to improve torque
The speed characteristics of an induction motor closely resemble the speed-load characteristics of which of the following machines
A D.C. series motor
B D.C. shunt motor
C Universal motor
D None of the above
The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve
A pentode
B tetrode
C triode
D diode

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