1.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?
A.Visually examine motor for open circuit faults.
B.Visually examine starter for open circuit faults.
C.Reverse the direction of electrical supply to check if it works.
D.Perform the infinite resistance test.
ANS A, B, D
2.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
ANS B, C
3.With reference to a Data Logger for a refrigeration system, which of the following parameters should be monitored?
A.Room temperature.
B.Liquid Line temperature.
C.Recharge temperature.
D.Solenoid valve operation.
ANS A, B, D
4.With reference to a Data Logger for a refrigeration system, which of the following parameters should be monitored?
A.Sea water temperature and pressure.
B.Condensing temperature
C.Refrigerant leakage
D.Evaporating temperature
ANS A, C
5.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.Ensure that the fuse in the motor is removed.
ANS A, B, C
6.The current in a semiconductor is produced by:
A.Electrons
B.Neutrons
C.Protons
D.Holes
ANS A, D
7.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
ANS A, B
8.Purpose of preferential trip to prevent
A.blackout
B.to avoid overload
C.to start heavy machinery
D.all
ANS A, B
9.To prevent electric shock during electric arc welding
A.Wear dry clothes
B.Wear insulated shoes
C.Keep first aid equipment ready
D.None of the above
ANS A, B
A.Visually examine motor for open circuit faults.
B.Visually examine starter for open circuit faults.
C.Reverse the direction of electrical supply to check if it works.
D.Perform the infinite resistance test.
ANS A, B, D
2.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
ANS B, C
3.With reference to a Data Logger for a refrigeration system, which of the following parameters should be monitored?
A.Room temperature.
B.Liquid Line temperature.
C.Recharge temperature.
D.Solenoid valve operation.
ANS A, B, D
4.With reference to a Data Logger for a refrigeration system, which of the following parameters should be monitored?
A.Sea water temperature and pressure.
B.Condensing temperature
C.Refrigerant leakage
D.Evaporating temperature
ANS A, C
5.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.Ensure that the fuse in the motor is removed.
ANS A, B, C
6.The current in a semiconductor is produced by:
A.Electrons
B.Neutrons
C.Protons
D.Holes
ANS A, D
7.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
ANS A, B
8.Purpose of preferential trip to prevent
A.blackout
B.to avoid overload
C.to start heavy machinery
D.all
ANS A, B
9.To prevent electric shock during electric arc welding
A.Wear dry clothes
B.Wear insulated shoes
C.Keep first aid equipment ready
D.None of the above
ANS A, B
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