NEA Electrical department

Old NEA question answers

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नेपाल को भूगोल

What will happen to the d.c. generator if the field winding attains the critical resistance?
a) It will generate maximum voltage
b) It will generate maximum power
c) It will not develop voltage at all
d) None of them

For which of the following machine residual magnetism is a requirement to build up voltage output?
a) Separately excited generator
b) Self-excited generator
c) All A.C. generators
d) None of them

The speed regulation of D.C. motor can be ideally achieved with

a) Variable excitation to the field of the motor
b) Constant excitation to the field of the motor
c) A.C. excitation to the field of the motor
d) No excitation to the field of the motor

The torque developed in D.C motor depends on
a) Armature Current
b) Magnetic field
c) Magnetic field and Magnetic Current
d) Speed

Which of the following motors have almost constant speed over their full load range?

a) DC series motors
b) AC series motors
c) DC shunt motors
d) Low resistance squirrel cage motors
e) (c) and (d) both