Kerala PSC Technical Supervisor Paper 2016

Kerala Public Service Commission Technical Supervisor Paper 2016

In a purely capacitive circuit voltage is
(a) leading the current
(b) in phase with current
(c) anti phase with current
(d) lagging the current

The reason for making laminations for core construction is
(a) to reduce weight
(b) to reduce Cu. loss
(c) to reduce lrm loss
(d) to reduce hysterisis loss

An autor transformer transfers power
(a) inductively only
(b) conductively only
(c) both inductively and conductively
(d) not transfers

When transformation ratio of an auto transformer is 0.8 and input is 3kW the power transferred conductively from primary to secondary is
(a) 0.6
(b) 0.8
(c) 1.2
(d) 2.4

The function of the commutator in a DC generator is
(a) to induce DC voltage
(b) to convert DC into AC
(c) to convert AC into DC
(d) to induce AC voltage

When coil span equal to pole pitch the winding is
(a) short pitched
(b) fractional pitched
(c) dull pitched
(d) over pitched

A 3 point starter is used to
(a) control the speed
(b) control the load
(c) limit the current
(d) decrease the efficiency

An AC Generator is equiped with
(a) Commutator
(b) split ring
(c) end rings
(d) slip rings

The speed of a rotating field is known as
(a) slip speed
(b) field speed
(c) synchronous speed
(d) actual speed

An induction motor works on the basis of
(a) Fleming’s rule
(b) Thump rule
(c) Ohms law
(d) Lenz’s law

A single phase induction motor has
(a) one stator winding
(b) two stator winding
(c) three stator winding
(d) no stator winding

The ratio of ampere hour efficiency to Watt hour efficiency of a lead acid cell is
(a) less than one
(b) one
(c) greater than one
(d) zero

A constant voltage charging system
(a) increases charging time
(b) reduces charging time
(c) same as constant current system
(d) it may increase or decrease

A kWh meter is classified as
(a) indicating instrument
(b) recording instrument
(c) intergrating instrument
(d) measuring instrument

The torque of an ammeter varies as the square of the current through it. If a current of 5A produces a deflection of 90 degree, what deflection will occur for a current of 3A, when the instrument is spring controlled
(a) 16.2 degree
(b) 32.4 degree
(c) 44.4 degree
(d) 66.2 degree

Multipliers are used for
(a) range extension of ammeters
(b) range extension of volt meters
(c) range extension of watt meters
(d) range extension of energy meters