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DSSSB Junior Engineer Electrical Paper 2015
Which of the following materials is NOT used for transmission and distribution of electrical power ?
(a) Copper
(b) Aluminium
(c) Steel
(d) Tungsten
Overhead system can be designed for operation up to
(a) 11 kV
(b) 33 kV
(c) 66 kV
(d) 400 kV
The underground system cannot be operated above
(a) 440 V
(b) 11 kV
(c) 33 kV
(d) 66 kV
By which of the following systems electric power may be transmitted ?
(a) Overhead system
(b) Underground system
(c) Both (a) & (b)
(d) None of the above
In a mercury arc rectifier positive ions are attracted towards
(a) anode
(b) cathode
(c) shell bottom
(d) mercury pool
In a rotary converter I2R losses as compared to a D.C generator of the same size wil be
(a) same
(b) less
(c) double
(d) three times
In which of the following equipment direct current is needed ?
(a) Telephones
(b) Relays
(c) Time switches
(d) All of the above
A rotary converter operates at a
(a) low power factor
(b) high power factor
(c) zero power factor
(d) None of the above
A rotary converter in general construction and design, is more or less like
(a) a transformer
(b) an induction motor
(c) an alternator
(d) any D.C. machine
Normally, which of the following is used, when a large-scale conversion from A.C to D.C power is required ?
(a) Motor-generator set
(b) Motor converter
(c) Rotary converter
(d) Mercury arc rectifier
The transformer laminations are insulated from each other by
(a) mica strip
(b) thin coat of varnish
(c) paper
(d) any of the above
Iron loss of a transformer can be measured by
(a) low power factor wattmeter
(b) unity power factor wattmeter
(c) frequency meter
(d) any type of wattmeter
Negative voltage regulation is indicative that the load is
(a) capacitive only
(b) inductive only
(c) inductive or resistive
(d) None of the above
If the supply frequency to the transformer is increased, the iron loss will
(a) not change
(b) decreases
(c) increases
(d) any of the above
An ideal transformer will have maximum efficiency at a load such that
(a) copper loss = iron loss
(b) copper loss < iron loss
(c) copper loss > iron loss
(d) None of the above
Last Updated on – 7th April 2022
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