Electrical Objective Type Questions-2

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Electrical Objective Type Questions

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Question #1: The two windings of a transformer is
conductively linked. inductively linked. not linked at all. electrically linked.

Question #2: The d.c. series motor should always be started with load because
at no load, it will rotate at dangerously high speed. it will fail to start. it will not develop high starting torque. all are true.

Question #3: The frequency of the rotor current in a 3 phase 50 Hz, 4 pole induction motor at full load speed is
50 Hz. 20 Hz. 2 Hz. Zero.

Question #4: In a stepper motor the angular displacement
can be precisely controlled it cannot be readily interfaced with micro computer based controller. the angular displacement cannot be precisely controlled. it cannot be used for positioning of work tables and tools in NC machines.

Question #5: The power factor of a squirrel cage induction motor is
low at light and heavy load both. low at heavy load only. low at light load only. low at rated load only.

Question #6: The generation voltage is usually
between 11 KV and 33 KV. between 132 KV and 400 KV. between 400 KV and 700 KV. None of the above.

Question #7: When a synchronous motor is running at synchronous speed, the damper winding produces
damping torque. eddy current torque. torque aiding the developed torque. no torque

Question #8: If a transformer primary is energised from a square wave voltage source, its output voltage will be
A square wave. A sine wave. A triangular wave. A pulse wave.

Question #9: In a d.c. machine, the armature mmf is
stationary w.r.t. armature. rotating w.r.t. field. stationary w.r.t. field. rotating w.r.t. brushes.

Question #10: In a transformer the voltage regulation will be zero when it operates at
unity p.f. leading p.f. lagging p.f. zero p.f. leading.

Question #11: The emf induced in the primary of a transformer
is in phase with the flux. lags behind the flux by 90 degree. leads the flux by 90 degree. is in phase opposition to that of flux.

Question #12: The current from the stator of an alternator is taken out to the external load circuit through
slip rings. commutator segments. solid connections. carbon brushes.

Question #13: A motor which can conveniently be operated at lagging as well as leading power factors is the
squirrel cage induction motor. wound rotor induction motor. synchronous motor. DC shunt motor.

Question #14: A hysteresis motor
is not a self-starting motor. is a constant speed motor. needs dc excitation. can not be run in reverse speed.

Question #15: The most suitable servomotor for low power applications is
a dc series motor. a dc shunt motor. an ac two-phase induction motor an ac series motor.