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SSC JE ELECTRICAL
ssc MCQs with answers - part-16
1. In dc generator, wave winding is used for which type of machines ?
-high voltage low current
-high current low voltage
-high voltage high current
-low voltage low current
Answer: high voltage low current
Explanation:
In dc generator, wave winding is used for high voltage low current type of machines
2. The space to height ratio in illumination lies between ?
-1 to 200
-1 to 20
-1 to 2
-1 to 2000
Answer: 1 to 2
Explanation:
The space to height ratio in illumination lies between 1 to 2
3. Moulded case circuit breaker is used for ?
-over load and short circuit protection
-over load protection
-short circuit protection
-open circuit protection
Answer: over load and short circuit protection
Explanation:
Moulded case circuit breaker is used for over load and short circuit protection.
4. Which of the following will need lowest level of illumination ?
-Displays
-Fine engraving
-Railway platform
-Auditoriums
Answer: Railway platform
Explanation:
Railway platform will need lowest level of illumination.
5. A mercury vapour lamp gives ?
-Pink light
-Yellow light
-Greenish blue light
-White light
Answer: Greenish blue light
Explanation:
A mercury vapour lamp gives Greenish blue light.
6. Heat is transferred simultaneously by conduction, convection and radiation ............ ?
-Inside boiler furnaces
-During melting of ice
-Through the surface of the insulated pipe carrying steam
-From refrigerator coils to freezer of a refrigerator
Answer: Inside boiler furnaces
Explanation:
Heat is transferred simultaneously by conduction, convection and radiation Inside boiler furnaces.
7. Heavy-duty steel-works cranes having wide load variations are equipped with ?
-DC series motors
-Plain squirrel cage induction motors
-Wound-rotor induction motors
-Synchronous motors
Answer: DC series motors
Explanation:
Heavy-duty steel-works cranes having wide load variations are equipped with DC series motors
8. In induction heating ?
-Heat is produced due to currents induced in the charge by electro-magnetic action.
-The resistance of the charge must be low and voltage applied must be high in order to produce sufficient heat
-
Magnetic materials can be easily treated in comparison to non-magnetic materials
-all option are correct
Answer: all option are correct
Explanation:
In induction heating Heat is produced due to currents induced in the charge by electro-magnetic action, The resistance of the charge must be low and voltage applied must be high in order to produce sufficient heat and Magnetic materials can be easily treated in comparison to non-magnetic materials.
9. The depth of penetration , in the case hardening of a steel pulley, required is 105mm. The relative permeability is unity and the specific resistance for steel is 5x10^-7 0hm-m. Determine the frequency required. ?
-56.3 KHz
-46.7 KHz
-52.7 Khz
-58.6 KHz
Answer: 56.3 KHz
Explanation:
The depth of penetration , in the case hardening of a steel pulley, required is 105mm. The relative permeability is unity and the specific resistance for steel is 5x10^-7 0hm-m. 56.3 KHz the frequency required.
10. When an electron breaks a covalent bond, and moves away ?
-the semiconductor becomes conductor
-a valency is created in broken covalent bond
-the conductivity of the material increases
-More ions are produced
Answer: a valency is created in broken covalent bond
Explanation:
When an electron breaks a covalent bond, and moves away a valency is created in broken covalent bond.
