FUNCTION -5 (ELECTRICAL)

31. Which of the following physical character does around rotor induction motor possess that squirrel cage motor does not
    1. Slip rings
    2. End rings
    3. A centrifugal clutch
    4. End plates

ANS.: A

32. Which of the following conditions will occur when solenoid coil burns out of a cargo winch with an electrical brake.
    1. The brake will be set by spring force.
    2. The motor will over speed and burns out
    3. The load suspended by the cargo boom will fail
    4. Nothing will happen; the winch will continue to operate normally

ANS.: A

33. A low voltage protection circuit is used in electric motor starting equipment to
    1. Trip circuit contractor when the motor over speed due to low voltage
    2. Trip circuit contractor when the motor develops short circuit due to low voltage
    3. Allows the motor to restart automatically on restoration of voltage without manual resetting
    4. Prevent motor from restarting automatically

ANS.: D

34. Determine the order of doping in transistor (from high to low)
    1. Collector, base, emitter
    2. Emitter, collector, base
    3. Base, emitter, collector
    4. Collector, emitter, base

ANS.: B

35. The opposition to the magnetic lines of force in magnetic is called
    1. Resistance
    2. Reluctance
    3. Impedance
    4. Inductance

ANS.: B

36. Factors varies potential of a PN junction depend on
    1. Type of semiconductor material
    2. Amount of doping
    3. Temperature
    4. None

ANS.: A,B,C

37. A poly phase motor driving engine room pumps fails to start, checks
    1. Insulation is open
    2. No restriction for movement of motor /pump
    3. Check overload relay trip
    4. Battery fully charged

ANS.:  A,B,C

38. Poly phase motor fails to start, precautions to take before checking
    1. Isolate motor
    2. Remove fuse
    3. Post caution sign
    4. Ensure starter/motor terminals are live

ANS.: A,B,C

39. Which of the following statement is true
    1. PNP & NPN are different transistors
    2. Emitter, base and collector are basic elements
    3. Base separates emitter and collector
    4. Emitter separates Base and Collector

ANS.: A,B,C

51. Purpose of silicon control rectifier
    1. C to D.C convertor
    2. High voltage stand
    3. SCR is used in alarm circuits
    4. Shunt regulator

ANS.: A,B,C

54. The induced voltage across a stationary conductor in a steady magnetic field is zero.
    1. TRUE
    2. FALSE

ANS.: A

55. Which of the listed devices is used to measure pressure and convert it to an electrical signal?
    1. Transducer
    2. Reducer
    3. Transformer
    4. Rectifier

ANS.: A

56. In three phase electrical equipment, the immediate action in the event of fuse blowing in one of the phases would be
    1. to replace with a fuse of correct rating
    2. to replace fuses on all three phases
    3. to try to repair the fuse
    4. to investigate the fault that led to blowing the fuse

ANS.: D

57. Which of the capacity has dielectric constant of 1.0000?
    1. air gap
    2. vacuum
    3. water
    4. electrolytes

ANS.: B

59. 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?
    1. Visually examine motor for open circuit faults.
    2. Visually examine starter for open circuit faults.
    3. Reverse the direction of electrical supply to check if it works.
    4. Perform the infinite resistance test

ANS.:  A,B,C

60. Tightly knit metal braid wire can be used with a printed circuit board when
    1. Conductor flexibility is required
    2. De-soldering components in the circuit
    3. Electrically produced magnetic fluxes would cause inaccuracies in adjacent components
    4. Reactance in the circuit must be kept to a minimum

ANS.: B