SSC Junior Engineer Electrical Online Exam 2018 CPWD/CWC/MES Electrical Engineering 22-01-2018 Morning9

81. The space to height ratio in illumination lies between?

A) 1 to 200
B) 1 to 20
C) 1 to 2
D) 1 to 2000

... Answer is C)
explanation will provide soon.

82. Moulded case circuit breaker is used for?

A) over load and short circuit protection
B) over load protection
C) short circuit protection
D) open circuit protection

... Answer is A)
explanation will provide soon.

83. Which of the following will need lowest level of illumination?

A) Displays
B) Fine engraving
C) Railway platform
D) Auditoriums

... Answer is C)
explanation will provide soon.

84. A mercury vapour lamp gives?

A) Pink light
B) Yellow light
C) Greenish blue light
D) White light

... Answer is C)
explanation will provide soon.

85. Heat is transferred simultaneously by conduction, convection and radiation.........?

A) Inside boiler furnaces
B) During melting of ice
C) Through the surface of the insulated pipe carrying steam
D) From refrigerator coils to freezor of a refrigerator

... Answer is A)
explanation will provide soon.

86. Heavey duty steel works cranes having wide load variations are equipped with?

A) DC series motors
B) Plain squirrel cage induction motors
C) Wound-rotor induction motors
D) Synchronous motors

... Answer is A)
explanation will provide soon.

87. In induction heating?

A) Heat is produced due to currents induced in the charge by electro-magnetic action.
B) The resistance of the charge must be low and voltage applied must be high in order to produce sufficient heat
C) Magnetic materials can be easily treated in comparision to non-magnetic materials.
D) All option are correct

... Answer is D)
explanation will provide soon.

88. The depth of penetration, in the case hardening of a steel puliey, required is 105 mm. The relative permeability is unity and the specified resistance for steel is 5×10–7 O-m. Determine the frequency required?

A) 56.3 KHz
B) 46.7 KHz
C) 52.7 KHz
D) 58.6 KHz

... Answer is A)
explanation will provide soon.

89. When an electron breaks a covalent bond, and moves away?

A) he semiconductor becomes conductor
B) a valency is created in broken covalent bond
C) the conductivity of the material increases
D) More ions are produced

... Answer is #)
explanation will provide soon.

90. A zener diode is invariably used with?

A) forward bias
B) reverse bias
C) either forward bias or reverse bias
D) zero bias

... Answer is B)
explanation will provide soon.





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