If you are appearing Hindustan Petroleum Corporation Limited Visakh Refinery Electrical Technician Recruitment exam 2020 and searching HPCL Electrical Technician Previous Year Paper/ Model Paper/ Sample Paper then you are at right place. Here, we are publishing Electrical Machines question paper for your practice.
Rajasthan Polytechnic Third Year Paper 2016 – Electrical Machines II
From the following parameter which parameter cannot be find out with the help of circuit diagram
(a) output
(b) efficiency
(c) power factor
(d) frequency
A 4 pole induction motor is connected to 50 Hz supply. Determine the synchrous speed
(a) 1480 rpm
(b) 1600 rpm
(c) 25 rps
(d) 20 rps
The directin of shaded pole motor is always
(a) towards shaded pole
(b) towards main pole
(c) towards unshaded pole
(d) None of the above
Pole pitch in alternator is
(a) 180 degree mechanical
(b) 180 degree electrical
(c) less than 180 degree electrical
(d) more than 180 degree electrical
Output voltage of alternator at generating station is usually
(a) 15 kV
(b) 110 V
(c) 220 V
(d) 132 kV
Main advantage of distribution of winding in slots
(a) Saving of copper
(b) reduced the size of machine
(c) reduced effect of harmonic in generated voltage
(d) improved the mechanical strength of winding
Synchronoscope is used for
(a) find out speed of synchronous motor
(b) output of synchronous
(c) to synchronize synchronous
(d) None of the above
Construction of synchronous motor is like
(a) D.C compound motor
(b) slip ring I.M
(c) Scharge motor
(d) Alternator
The power factor of over excited synchronous motor is
(a) more than 1
(b) 1
(c) legging p.f
(d) leading p.f
Field winding of rotor of synchronous motor is excited by
(a) A.C supply
(b) D.C supply
(c) 220 V, 50 Hz
(d) 220 V, 25 Hz
Slip of synchronous motor at full-load
(a) 0.2
(b) 0.5
(c) 0
(d) 1.0
When field excitation of synchronous motor change
(a) Power factor and Armature current change
(b) Only power factor change
(c) Only armature current change
(d) None of the above
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