1.
In an N-Type
Semiconductor, the majority current Carriers are _electrons_.
2.
. Which
of the listed precautions should take while cleaning poly phase motor internals
with compressed air? (Multiple ans)
A. Open the machine as both ends so as to allow the dust to escape
B. Be certain that the circuit breaker is opened ,tagged as the feeder panel
C. Be certain that air is clean and as dry as possible
D. Ensure that the fuse is removed
A. Open the machine as both ends so as to allow the dust to escape
B. Be certain that the circuit breaker is opened ,tagged as the feeder panel
C. Be certain that air is clean and as dry as possible
D. Ensure that the fuse is removed
3.
. Which of the
following statements represents an application of a silicon controlled
rectifier?
A. To provide DC power for a main propulsion motor.
B. For use as a voltage reference diode.
C. For sensing flame in an automated burner.
D. To eliminate power supply hum.
A. To provide DC power for a main propulsion motor.
B. For use as a voltage reference diode.
C. For sensing flame in an automated burner.
D. To eliminate power supply hum.
4.
When paralleling
an AC generator with live bus bars, which of the following precautions are
applicable?
A. Generator frequency should be slightly lower than bus bar frequency
B. Generator frequency should be slightly higher than bus bar frequency
C. Generator voltage should be in phase with bus bar voltage
D. Generator voltage should be out of phase with bus bar voltage
A. Generator frequency should be slightly lower than bus bar frequency
B. Generator frequency should be slightly higher than bus bar frequency
C. Generator voltage should be in phase with bus bar voltage
D. Generator voltage should be out of phase with bus bar voltage
5.
. If an
intrinsic semiconductor is doped with a very small amount of boron then the
extrinsic semiconductor set formed, the no. of electrons and holes will
A. Both decreases
B. Increase and decrease
C. Both increase
D. Decrease and increase
A. Both decreases
B. Increase and decrease
C. Both increase
D. Decrease and increase
6.
. A
poly phase motor driving an engine room pump fails to start, when trying to
identify the cause of failure, which of the following steps are
applicable.(multiple ans)
A. visually examine the motor for open circuit fault
B. visually examine the stator for open circuit fault
C. Reverse the direction of current for its working
D. Perform the infinite resistance test
A. visually examine the motor for open circuit fault
B. visually examine the stator for open circuit fault
C. Reverse the direction of current for its working
D. Perform the infinite resistance test
7.
With
reference to the data logger for a refrigerate sys. Which of the parameters
should be noted?
A. sea water temp, pressure
B. condenser temp
C. Refrigerant leakage
D. Evaporator temp.
A. sea water temp, pressure
B. condenser temp
C. Refrigerant leakage
D. Evaporator temp.
8.
. When
the current through the coil of an electromagnet is reversed, the direction of
magnetic field also reversed (TRUE or FALSE)
9.
. W.r.t
to a data logger for a refrigerant sys. Which of the following parameters
should be checked?
A. room temp
B. liquid ref temp
C. Recharge temp.
D. Solenoid valve operation
A. room temp
B. liquid ref temp
C. Recharge temp.
D. Solenoid valve operation
10. *Open-loop transfer function of a system having one zero with
positive real values is called nonminimum
phase function
11.
Which of the listed devices may be installed on a
large turbo-electric alternating
current propulsion generator?
A. Temperature detector coils inserted in the stator slots for measuring stator temperature.
B. A CO2 fire extinguishing system.
C. Electric space heaters to prevent condensation of moisture.
D. All of the above
current propulsion generator?
A. Temperature detector coils inserted in the stator slots for measuring stator temperature.
B. A CO2 fire extinguishing system.
C. Electric space heaters to prevent condensation of moisture.
D. All of the above
12.
Which of the listed conditions is an advantage of
a PN diode over a vacuum diode?
A. Longer life.
B. No warm up time.
C. Less delicate.
D.All of the above
13.
Which of the following conditions will occur when
solenoid coil burns out of a cargo winch with a electrical brake.
A.The brake will be set by spring force.
B.The motor will over speed and burns out
C.The load suspended by the cargo boom will fail
D.Nothing will happen, the winch will continue to operate normally
A.The brake will be set by spring force.
B.The motor will over speed and burns out
C.The load suspended by the cargo boom will fail
D.Nothing will happen, the winch will continue to operate normally
14.
Where a
thermal-acting breaker is required to be used in an area of unusually high,
low, or constantly fluctuating temperatures, an ambient compensating element
must be used. This element consists of a
A.Cylindrical spring on the contact arm.
B.Conical spring on the contact arm.
C.Second bimetal element.
D.Second electromagnet.
A.Cylindrical spring on the contact arm.
B.Conical spring on the contact arm.
C.Second bimetal element.
D.Second electromagnet.
15.
Vgs and Id approximately
zero....this is called cutoff
voltage
16.
*A poly-phase
motor driving an engine room pump fails to start. When trying to identify the
cause of failure, which of the following steps are applicable?(Multi Ans)
A. Ensure that the isolator is open.
B. Make sure that there is no restriction preventing movement of pump/motor.
C. Check whether the overload relay has tripped.
D. Check whether battery is fully charged
A. Ensure that the isolator is open.
B. Make sure that there is no restriction preventing movement of pump/motor.
C. Check whether the overload relay has tripped.
D. Check whether battery is fully charged
17.
In a
Transistor
A.PNP and NPN are two basic types
B.Emitter,Collector and Base are the basic Elements.
C.Collector separates Base and Emitter
D.Emitter separates Base and Collector
A.PNP and NPN are two basic types
B.Emitter,Collector and Base are the basic Elements.
C.Collector separates Base and Emitter
D.Emitter separates Base and Collector
18.
The basic
measuring unit of inductance is the
A.coulomb
B.ohm
C.farad
D.henry
A.coulomb
B.ohm
C.farad
D.henry
19.A certain appliance uses 750 W.
If it is allowed to run continuously for 15 days, how many kilowatt-hours of
energy does it consume?
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20.What is the magnetomotive force
in a 75-turn coil of wire when there are 4 A of current through it?
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21. A semiconductor is damaged by a strong current, because of (1)________
(2)________ (3)________
1) SHORT CIRCUIT
2) OVERLOAD
3) OVERCURRENT
SOME OTHER Q WHRE ANS WAS ZENER AND
AVALANCHE EFFECT AND REVERSE BAIS BREAKDOWN
22. which of the following capacitor is having highest di electric constant
A.air gap
B.glass
C. paper
D.polyster
A.air gap
B.glass
C. paper
D.polyster
23. the conductive loop of the rotor of
a simple two poles,single phase generator rotates at 400 rps.cal the frequency
induced output voltage
ANS 400HZ
SAME Q WITH 1200 RPS ANS 1200 HZ
24.SOME Q IN WHICH THERE R 4
CAPACITORS 6,8,3,10 IN SERIES. FIND THEIR EFFECTIVE
ANS 1.37 FARAD
25. A certain appliance use 350W, if it
is allowed to run continous for 24 days , how many kw of energy does it consume
(fill in the blank)
ans 201.6 kwhr
26. Alfa particles
enter an electromagnetic field where the electric intensity is 600v/m and the
magnetic induction is 0.200T what is the velocity of alfa particles?
ANS 2000 M/S
27. What happens to
the strength of electro magnetic field when current passing through an inductor
is halfed ________
a. ¼
b. ½
c. 2
d. 4
a. ¼
b. ½
c. 2
d. 4
28. Find the amps required by the electrical bulb,if the
elecrtonmakes ??10?? moves about 22 elecrtons in one hour.assume a charge at
electron be -1.602*10^19.
ANS .445
IN EXAM IT WAS ASKED FOR 0.25 HOUR…
29.which of the following states
concerning Analog and digital devices is correct
a.the variable in digital are fixed & in analog they
are continuous qtys.
b.no basic diff between the 2
c.analog devices r superior in
accuracy as comp to digital.
d.operations in digi device r
performed simultaneously.
30.reverse current prevents dc gen
motoring by
a.redirecting the load
b.speeding up the prime mover
c.securing the excitor generator
d.tripping the crkt breaker.
31.some q abt varnished cambric
Ans cotton cloth with insulated
varnish
32.in an ac synchronous motor
electric prop plant, propeller speed is cont varied by:
a.prime mover speed.
b.elec coupled field strength
c.no of energizing main motor
poles
d.propulsion gen field strength.
Good luck………………!!!
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