Search
.Management Sciences
Category: Electrical Engineering Mcqs
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
Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?
A. current during abnormal condition
B. voltage during abnormal condition
C. constantly the electrical quantities which differ during normal and abnormal conditions
D. none of the above
SI unit of the permittivity of free space is________________?
A. Nm2C2
B. N-1mC-2
C. NmC-1
D. N-1m-2C2
Recent Comments