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Cochin Shipyard JTA Quality Control Electrical Paper 2020
Exam Date – 11th Jan 2020
CSL Junior Technical Assistant QC Electrical Paper 2020
D.C. series motors are used in electric traction. What happens to the speed and current of d.c. motor if there is sudden slight drop in the mains voltage ?
(a) Speed decreases and current also decreases
(b) Speed decreses and current increases
(c) Speed increases and current decreases
(d) Speed decreases and current remains same
d
The efficiency of a transformer will be maximum when ______
(a) resistances of the two windings are equal
(b) copper loss is equal to constant loss
(c) leakage reactances of the two windings are equal
(d) None of these
b
A series motor is best suited for driving
(a) Lathes
(b) Cranes and hoists
(c) Shears and punches
(d) machine tools
b
Insulation resistance is measured in
(a) Ohm meter
(b) micro meter
(c) megaohm
(d) mili ohm
c
The force tending to move the electricity is called
(a) Current
(b) resistance
(c) emf
(d) potential difference
c
Two electric bulbs rated for the same voltage have powers of 150 W and 50 W. If their resistances are respectively R1 and R2 the,
(a) R1 = 3R2
(b) R2 = 3R1
(c) R2 = 9R1
(d) R1= 9R2
b
Damper windings are used in alternators to
(a) prevent hunting
(b) achieve sychronism
(c) reduce windage losses
(d) All of the options
a
Which of the following instrument is not desirable for measurement of AC values
(a) Moving iron repulsion type
(b) Moving iron attraction type
(c) Dyanmometer type
(d) Permanent magnet moving coil type
d
The power factor of an alternator is decided by its
(a) speed
(b) load
(c) Excitation
(d) Prime mover
b
The boundary of the protective zone in an electrical system is determined by the ______
(a) Location of CT
(b) Sensitivity of relay used
(c) Location of PT
(d) None of the options
b
Zener diodes are mainly used as
(a) Rectifier
(b) Amplifier
(c) Oscillator
(d) Voltage Regulator
d
Transformer transforms
(a) Frequency
(b) Voltage
(c) Current
(d) Voltage and Current
d
A universal motor is one which
(a) is available universally
(b) Can be marketed internationally
(c) Can be operated either on dc or ac supply
(d) Runs at dangerously high speed on no load
c
If an autotransformer having transformation ratio equal to 0.6 is supplying a load of 8 kw, then its power transferred from primary to secondary is given by
(a) 3 kW
(b) 3.2 kW
(c) 3.4 kW
(d) 3.5 kW
b
A machine operating as motor may go into regenerative braking mode if its speed becomes
(a) Sufficiently high to make back emf greater
(b) Sufficiently low to make back emf greater than supply voltage
(c) Sufficiently high to make back emf half of the supply voltage
(d) Sufficientyly low to make back emf half of the supply voltage
a
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