Marine Electro Technology - MET E-Pariksha online questions

1.Which of the following statements is true concerning a poly-phase synchronous propulsion motor?
A.The motor is started as an induction motor.
B.Resistance is gradually added to the rotor circuit.
C.The starting current is held below the rated current.
D.The field winding is energized for starting purposes only.

2.When reading electrical motor controller diagrams, it helps to know that ____________.
A.current paths in the control circuit are drawn as heavy lines and in the power circuit as lighter  lines
B.current paths in the power circuit are drawn as heavy lines and in control circuit as lighter lines
C.circuits subject to 500 volts or greater are drawn as heavy lines and below 500 volts as lighter lines

D.circuits subject to 500 volts or greater are drawn as light lines and below 500 volts as heavy

3.Alternating current circuits develop resistance, inductance and capacitance. The inductance of a coil is expressed in _____________.
A.ohms                    
B. mhos                      
C. henrys                
D. farads

4.Large cable sizes are formed as individual conductors that may be comprised of several smaller strands to __________.
A.obtain the flexibility required for easy handling
B.reduce the overall weight of the wire run
C.reduce the number of supports needed for a horizontal overhead run
D.all of the above


5.Which of the following is having Di-Electric Constant 80?
A.Air
B. water
C. Mica
D. Caster oil

6.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


7.Which of the following precautions should you take when securing propulsion generators and motors for an extended period of time?

A.Disconnect the brush pigtails from their contacts and circulate air through the units.
B.Disconnect the brush pigtails from their contacts and discharge carbon dioxide into the units to keep them dry.
C.Lift the brushes from commutator collector rings and use the built-in heater to prevent moisture accumulation.
D.Lift the brushes from commutator collector rings and circulate cool dry air through the units.

8.The direction of magnetic flux changes when the direction of current is reversed.

True / False


9.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

9.  In a P-Type Semiconductor, the majority current Carriers are ___________.

10.In a Control Loop System, having Zero(0) Positive Real Values are called ____________.
 
11. If a Motor is not rotating in the E/R, you will carry out the following Checks (multiple choice, 3 Questions of same type but Options were different  )
A. Check for the isolation
B. Rotate the Coupling with your hand
C. Check for the Circuit breaker
D. Remove the fuses
E Look for the Overload Trip
F. Visually Inspect the motor terminals
G. Visually Inspect the Starter Terminals
H. Carry out Infinite Resistance Test

14. Calculate the Velocity of the conductor (up to 0 decimal places), if terminal voltage is 2.2 V/m and the magnetic field strength is 0.2 T. .

15. Calculate the frequency of the motor ( up to 0 decimal places),, if the speed if 4800 Rpm and number of Poles is 2.

16. If the resistance of any coil is 120 Ohm. Calculate the Resistance (up to 0 decimal places),  when its Length is increased by 20% and its Diameter is increased by 50%.

17. What is the power in a Resistor in Milli Watts (up to 0 decimal places), having Resistance of 12 Ohm having a Potential Difference of 3 V.

18. Resistance of a wire is increased if the Length is____  and Area is _____.

19. Arrange the following in Increasing Order of their Doping Strength.  Answer is-Base, collector, emitter
A. Collector, Emitter, Base
B. Base, Emitter, Collector
C. Emitter, Base, Collector
D. Emitter, Collector, Collector Base, Collector, Base

20. Which of the listed precautions should be taken when cleaning
the internals of a motor with compressed air?
A. Open the machine on both ends so as to allow the air and dust to escape.
B. Be certain that the circuit breaker is opened and tagged on the feeder panel.
C. Be certain that the air is clean and as dry as possible.
D. All of the above