Which of the following precautions should you take when securing propulsion generators and motors for an extended period of time?
The direction of magnetic flux changes when the direction of current is reversed.
When paralleling an AC generator with live bus bars, which of the following precautions are applicable? (Multi choice)
The induced voltage across a stationary conductor in a steady magnetic field is zero.
Which of the following capacitor is having highest dielectric constant?
Fuses placed in series with a thermal trip type circuit breaker are used for
In a Transistor (If Multi choice add option A)
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
Which of the following statements represents an application of a silicon controlled rectifier?
A fuse that blows often should be replaced only with a fuse of
A delayed action fuse is most frequently used in which of the listed circuit?
Large cable sizes are formed as individual conductors that may be comprised of several smaller strands to
Factors varies potential of a PN junction depend on (multiple ans)
The opposition to the magnetic lines of force in magnetic is called
Alternating current circuits develop resistance, inductance and capacitance. The inductance of a coil is expressed in
The apparent power in inductive circuit
Which of the listed precautions should take while cleaning poly phase motor internals with compressed air? (Multiple ans)
Purpose of silicon control rectifier (*Multiple choice)
Which of the following is having Di-Electric Constant 80?
When reading electrical motor controller diagrams, it helps to know that _____
Arrange the following in Increasing Order of their Doping Strength.
Silicon diodes designed for a specific reverse breakdown voltage, become useful as an electronic power supply voltage regulator, called _____________
Which of the following statement is true (*)
Time delayed or delayed action-type fuses are designed to _____________.
Which of the following physical character does around rotor induction motor possess that squirrel cage motor does not
A poly phase motor driving engine room pumps fails to start, checks
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 choice)
Which of the capacity has dielectric constant of 1.0000?
Which of the following statements is true concerning a poly-phase synchronous propulsion motor?
Poly phase motor fails to start, precautions to take before checking
Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?
Which of the following statements best describes the material known as varnished cambric?
Which of the following conditions will occur when solenoid coil burns out of a cargo winch with an electrical brake
When the current through the coil of an electromagnet is reversed, the direction of magnetic field also reversed
For leading power factor circuits, which of the following can be used?
Determine the order of doping in transistor (from high to low)
In three phase electrical equipment, the immediate action in the event of fuse blowing in one of the phases would be
A low voltage protection circuit is used in electric motor starting equipment to
A synchronous motor maintains synchronism with the rotating field because
A molded-case breaker provides protection against short-circuits by using a/an
If current reverses, the magnetic field also reverses; true (or) false
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 choice)
The part of a fuse that melts and opens the circuit is made of
Brushless generators are designed to operate without the use of
PN diode advantage over vacuum diode?
Tightly knit metal braid wire can be used with a printed circuit board when
The current in a semiconductor is produced by
Which of the listed devices is used to measure pressure and convert it to an electrical signal?
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