Kerala PSC Electrician Paper 2016

Kerala Public Service Commission Electrician Paper 2016

Repulsion motor is provided with
(a) Commutator
(b) Centrifugal switch
(c) Capacitor
(d) Squirrel cage rotor

Whenever a poly phase motor is loaded the
(a) induced emf in the rotor increases and its frequency falls
(b) induced emf in the rotor increases and its frequency rises
(c) induced in the rotor remains constant
(d) induced emf in the rotor decreases and its frequency increases

For three resistance are connected in three phase, the power consumed will be more in ________connection
(a) star delta
(b) star
(c) delta
(d) delta-star

Synchronous motors run on leading power factor when connected in
(a) under excitation
(b) rated excitation
(c) fully loaded
(d) over excitation

The output voltage of a solar cell is approximately
(a) 1.2 V
(b) 0.5 V
(c) 2.1 V
(d) 3.0 V

Slip rings are generally made of
(a) phosphor bronze
(b) aluminium
(c) copper
(d) carbon

The hydrometer reading of fully charged lead acid battery
(a) 1.2
(b) 1.5
(c) 1.11
(d) 1.26

In induction motor percentage slip is maximum at
(a) low speed
(b) medium speed
(c) stand still condition
(d) synchronous speed

Economiser is a part of
(a) hydel PS
(b) nuclear PS
(c) thermal PS
(d) diesel PS

The crawling in an induction motor is caused by
(a) improper design of the machine
(b) low voltage supply
(c) high load
(d) harmonics developed in the motor

The commutator segments are placed in
(a) rotor
(b) stator
(c) armature
(d) field

Reduction in the capacitance of capacitor start motor results in reduced
(a) noise
(b) starting torque
(c) speed
(d) armature reaction

In an ac circuit the ratio of kW/kVA represents
(a) power factor
(b) load factor
(c) starting torque
(d) diversity factor

The unit of inductance is
(a) OHM
(b) MHO
(c) HENRY
(d) FARAD

Ear to ear resistance of human body
(a) 400
(b) 1 kilo ohms
(c) 650 ohms
(d) 100 ohms

Centrifugal switches is provided for disconnecting the auxiliary winding in a
(a) capacitor run motor
(b) capacitor start motor
(c) reluctance motor
(d) hysteresis motor

Transformer core is laminated to
(a) reduce the copper loss
(b) reduces the eddy current loss
(c) reduces the core loss
(d) hysteresis loss

Which type of loss is NOT common to transformer and rotating machines ?
(a) eddy current loss
(b) copper loss
(c) hysteresis loss
(d) windage loss

The difference between the synchronous speed and the actual speed of an induction motor is known as
(a) Slip
(b) regulation
(c) back lash
(d) lag

Three resistances of 30, 15, 5 ohms are connected in parallel, their combined resistance will be
(a) greater than 30 ohm
(b) between 30 to 15 ohm
(c) less than 5 ohm
(d) between 15 to 5 ohm


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