Specifications

13
QUESTIONS
Part - A
Choose the Correct Answer (1 Mark)
1) Insulating materials are used between
A) Conducting materials and Non-conducting materials
B) Two non-conducting materials
C) Two conducting materials (both not part of current carrying circuit)
D) Two conducting materials (of which only one is part of current carrying circuit)
2) Identify which one of the following is Liquid Insulating material
A) Rubber B) varnish C) Argon D) paper
3) Thermal Insulation class to which MICA belongs is
A) Class A (105
o
c) B) Class B (130
o
c)
C) Class F (155
o
c) D) Class C (>180
o
c)
4) For which material insulating varnish coating should be applied compulsorily?
A) Mica tape B) rubber tape C) cotton tape D) Plastic tape
5) Which one of the following is used as slot liner in an electric motor?
A) silk tape B) Micanite tape C) Film paper D) fibre board
6) wood as sticks is used as ———————in an electric motor.
A) Insulator B) Support C) Wedge D) Conductor
7) The electrical devices coated with ————— varnish should be heated at about 100
o
c for
3 – 5 hours to attain good insulating property.
A) Laequer B) bonding
C) Finishing varnish D) Impregnating Varnish
8) The Nitrogen gas is used as ————————— in electrical equipment.
A) Conductor B) Insulator C) Coolant D) Lubricant
9) ——————— class of insulating material is not preferred in electric motor, because it is
brittle.
A) A B) B C) E D) C
10) Higher operating —————————, is the main reason for the degradation of he insulating
material in an electrical device.
A) Voltage B) Temperature C) time D) humidity