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.Management Sciences
Category: Electrical Engineering Mcqs
Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?
A. D.C. series motor
B. D.C. shunt motor
C. induction motor
D. all of above motors
Charging a sulphated battery at high rate results in___________?
A. boiling of electrolyte due to gassing
B. warping of plates
C. damage to separators, cell caps covers and battery case due to excessive temperature
D. all above
A permanent magnet______________?
A. attracts some substances and repels others
B. attracts all paramagnetic substances and repels others
C. attracts only ferromagnetic substances
D. attracts ferromagnetic substances and repels all others
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?
A. nothing will happen to the motor
B. this will make armature to take heavy current, possibly burning it
C. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses D. motor will run at very slow speed
Which one of the following does not have negative temperature co-efficient ____________?
A. Aluminium
B. Paper
C. Rubber
D. Mica
At parallel resonance, the net reactive component circuit current is _______________?
A. Capacitive
B. Zero
C. Inductive
D. None of the above
A synchronous motor develops maximum power when load angle is____________?
A. 45°
B. 60°
C. 90°
D. 120°
In the indirect resistance heating method, maximum heat-transfer takes place by____________?
A. radiation
B. convection
C. conduction
D. any of the above
Extent of corrosion in the underground metal work depends upon___________?
A. amount of moisture
B. type of metals
C. type of soil chemicals
D. all above factors
In case of D.C. machines, mechanical losses are primary function of____________?
A. current
B. voltage
C. speed
D. none of above
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