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95MET-4
Sr. No. 6
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Electrical, Electronic & Control Engineering at Operational Level
MARINE ELECTROTECHNOLOGY
India (2003)
M.E.O. Class IV
(Time allowed - 3hours)
Morning Paper
Total Marks 100
NB : (1)Answer SIX Questions :
SECTION -1 :- Answer atleast TWO Questions
SECTION -2 :- Answer atleast TWO Questions
(2)All Questions carry equal marks
(3)Neatness in handwriting and clarity in expression carries weightage
(4) Illustration of an Answer with clear sketches / diagrams carries weightage.
SECTION – 1
1. With reference to the provision of a shore electrical supply to a ship:
(a) Sketch an arrangement for taking A.C. shore supply;
(b) Describe the method of safely connecting the arrangement sketched in (a) to the shore supply.
2. Describe the overhaul of a d.c. motor which has been subjected to excessively damp condition or
flooding with seawater.
3. (a) State the necessary conditions required prior to the synchronizing of electrical alternators.
(b) Describe the type of cumulative damage that may be caused when alternators are incorrectly
Synchronized.
4. Sketch an electric telegraph system and describe its operation.
5. (a) Sketch a circuit diagram for an automatic voltage regulator illustrating how the A.V.R. utilizes a
silicon-controlled rectifier to control the excitation system for an alternator.
(b) Describe how the A.V.R. monitors output and controls the excitation system.
SECTION - 2
6. A 3-phase, 38kW, 440V, 50 c/s induction motor operates on full load with, an efficiency of 89% and
at a power factor of 0.85 lagging. Calculate the total kVA rating of capacitors required, to raise the
full load power factor to 0.95 lagging.
7. With the aid of sketch describe the main features and principle of operation of a D.C. moving coil
meter. If such a meter is designed to give full scale deflection with 150 m, State how it may be
adapted:
(i)
As an ammeter to read up to 150 A.
(ii)
As a volmeter to read up to 150 V.
No calculations are required.
8. Local action in a nickel-cadmium battery is offset by _____________.
(a) separating the positive and negative plates with plastic spacers
(b) separating the positive and negative plates with resin impregnated spacers
(c) adding a small amount of lithium hydroxide to the electrolyte
(d) trickle charging
Briefly Justify Your Answer
9. The basic control action of a magnetic amplifier depends upon _____________.
(a) variations in the load capacitance
(b) changes in inductance
(c) type of core material
(d) construction of the core
Briefly Justify Your Answer
10. The seven segment arrangement for numerical display on consoles, test meters and other applications
can be either ________________.
(a) UJT or BJT
(b) BCD or OCD
(c) JFET or IGFET
(d) LED or LCD
Briefly Justify Your Answer
95MET-4
Sr. No. 6
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Electrical, Electronic & Control Engineering at Operational Level
MARINE ELECTROTECHNOLOGY
India (2003)
M.E.O. Class IV
(Time allowed - 3hours)
Morning Paper
NB : (1)Answer SIX Questions :
SECTION -1 :- Answer atleast TWO Questions
SECTION -2 :- Answer atleast TWO Questions
(2)All Questions carry equal marks
(3)Neatness in handwriting and clarity in expression carries weightage
(4) Illustration of an Answer with clear sketches / diagrams carries weightage.
Answers
Answer for Question No. 6
26.47
14.04
12.43
Answer for Question No. 8
Correct Answer : D
Answer for Question No. 9
Correct Answer : B
Answer for Question No. 10
Correct Answer : D
Total Marks 100