ESPS - UNIT II

1.Which of the following is the protective device against lightning over voltages?

• A. Rod gaps

     

•    B. Surge absorbers

     

•    C. Horn gaps

     

•    D. All of the above

2.A lightning arrester provides

• A. A low impedance path between line and ground, during operation

   

     

     

•  B. A high impedance path between line and ground, during operation

• C. A low resistance path between line and ground, during operation

• D. A high resistance path between line and ground, during operation

3.Lightning arresters are used in power system to protect electrical equipments against

•  A. Direct strokes of lightning

   

   

     

•  B. over voltages due to indirect lightning stroke

•  C. Power frequency over-voltages

• D. Over currents due to lightning

4.A lightning arrester provides

• A. High resistance path between line and earth during operation

• B. High impedance path

•  C. Low resistance path

• D. Low impedance path

5.A lightning arrester connected between the line and earth in a power system

•  A. Protects the terminal equipment against direct lightning stroke

• B. Protects the terminal equipment against travelling surges

   

   

     

•  C. Suppresses high-frequency oscillations in the line

• D. Reflects back the travelling waves approaching it

6.Basically a lightning arrester is a

• A. Surge alternator

• B. Surge diverter

     

     

   

• C. Surge reflector

•  D. Surge absorber

8. 7. Industrial safety management if that branch of management which is concerned with ______ hazards from the industries.

• (A) Reducing

• (B) Controlling

• (C) Eliminating

• (D) All of the above

8.Check list for Job Safety Analysis (JSA) consists of

• (A) Work area, material, machine, tools

• (B) Men, machine, material, tools

• (C) Men, machine, work area, tools

• (D) Men, work area. Material, tools

9.For household wiring and small units, the following should be used for safety measure

• (A) MCB

• (B) ACB

• (C) OCB

• (D) MCCB

10.Which of the following colour is used for radiation hazard?

• (A) Red

• (B) Orange

• (C) Green

• (D) Purple