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95MET-4
Sr. No. 10
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Electrical, Electronics and Control Engineering
at Operational Level
MARINE ELECTRO TECHNOLOGY
CLASS IV
INDIA (2001)
(Time allowed - 3 hours)
Morning Paper
Total Marks 100
N.B. - (1) All questions are compulsory.
(2) All questions carry equal marks.
(3) Neatness in handwriting and clarity in expression carries weightage
1.Which of the following represents the accepted method o f cleaning dust andforeign particles from
electrical equipment while limiting damage to electric components?
(A)Carefully wiping off the components with a soft cottonrag.
(B) Blowing a high velocity stream of compressed air rapidly across the components.
(C) Using a vacuum cleaner to remove debris from thecomponents.
(D)Using carbon tetrachloride as a cleaning solvent to clean the components.
Briefly Justify Your Answer
2.Regarding an AC generator connected to them am electrical bus; as the electric load and power factor
vary,a corresponding change is reflected in t he generator armature reaction. These changes in
armature reaction are compensated for by the _____________.
(A)governor speed droop setting
(B) voltage regulator
(C) balance coil
(D)phase-balance relay
Briefly Justify Your Answer
3.In an induction motor, rotor currents arecirculated in the rotor by _____________.
(A)slip rings and brushes
(B) an armature and b rushes
(C) inductive reaction of the rotating stator field
(D)external variableresistors
Briefly Justify Your Answer
4.An electrical dev ice which prevents anaction from occurring until all other required conditions are met
is called a/an ___________.
(A)limit
(B) monitor
(C) modulator
(D)interlock
Briefly Justify Your Answer
5.A circuit breaker and a fuse have a basic similarity in that they both _______ ______.
(A)can be reset to energize the circuit
(B) should open the circuit when overloaded
(C) will burn out when an over current flow develops
(D)all of the above
Briefly Justify Your Answer
6.The electrolyte in a lead-acid storage battery consists of distilled water and _____________.
(A)hydrogen chloride
(B) calcium chloride
(C) sulfuric acid
(D)muriatic acid
Briefly Justify Your Answer
7. An eight-pole armature is wound with 480 conductors. The magnetic flux and speed are such that the
average e.m.f generated in each conductor is 2.2A. Calculate the terminal voltage on no-load, the
output current on full load and total power generated on full load when the armature is
(A) lap-connected and
(B) wave-connected
8. What is meant by the resistivity (or specific resistance) of a conductor? An Aluminum wire 1.25mm
in diameter is connected in parallel with a brass wire 2m. long and of 1.5mm diameter. When the
combination is connected across an electric supply 1/3 of the total current which flows passes through
the brass-wire. Calculate the length of the aluminum wire given that resistivity of brass
= 8
resistivity of aluminum
3
9. A non-linear resistance R1 is in parallel with a linear resistance. R2 across a 110 V D.C. supply.
R2 = 220 
R1 has the following volt-amp. Characteristic :Volts ….
0
32
60
100
125
140
Amperes ….
0
0.05
0.1
0.2
0.3
0.4
R1 is bilateral i.e. conducts equally well in either direction. Plot the characteristics for each resistance
and determine the current taken from the supply.
10. A metal filament lamp, rated at 750 W, 100 V, is to be connected in series with a capacitor across a
230V, 60 Hz supply. Calculate –
(A) the capacitance required and
(B) the phase-angle between the current and supply voltage.
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95MET-4
Sr. No. 10
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Electrical, Electronics and Control Engineering
at Operational Level
MARINE ELECTRO TECHNOLOGY
CLASS IV
INDIA (2001)
(Time allowed - 3 hours)
Morning Paper
Total Marks 100
N.B. - (1) All questions are compulsory.
(2) All questions carry equal marks.
(3) Neatness in handwriting and clarity in expression carries weightage
Answers
Answer for Question No. 1
Correct Answer : C
Answer for Question No. 2
Correct Answer : B
Answer for Question No. 3
Correct Answer : C
Answer for Question No. 4
Correct Answer : D
Answer for Question No. 5
Correct Answer : B
Answer for Question No. 6
Correct Answer : C
Answer for Question No. 7
105.6kw
Answer for Question No. 8
1.85 meters
Answer for Question No. 9
0.72
Answer for Question No. 10
64012’