Electrical Knowledge by Sachin Sir

Which law secondary cell works?

Q) WYB, XUD, YQF, ...

Q) WXCD, UVEF, STGH, QRIJ, ?

Q) Reasoning JAF, JEF, JIF, JOF, ? A) PIG B) PET C) JUF D) POT

Q) Air blast circuit breaker is usually used for (a) instantaneous duty (b) permanent break (c) intermittent duty (d) repeated duty

Q) The power factor of the arc in circuit breaker is (a) always zero (b) always unity (c) always lagging (d) always leading

Q) SF6 gas is imported in _____________ a. Air cylinders b. Gas cylinders c. Liquid form in cylinders d. Solid form.

Q) For rural electrification in India, which circuit breaker is generally used? a. Oil b. SF6 c. Vacuum d. Air blast

Q) What is the main purpose of oil in oil circuit breakers? a. Provide insulation b. Quenching arc. c. Provide cooling of contacts. d. None of the above

Q) For which among the following the current ratings are not required? a. Circuit breakers b. Relays c. Isolators d. Load break switch

Q) A thermal protection switch provides protection against what? a. Overload b. Temperature. c. Short circuit. d. Over voltage

Q) Breaking capacity of a circuit breaker is usually expressed in terms of A) MVA B) MW C) Volts D) Amperes

Q) A material best suited for manufacturing of fuse wire is A) Copper B) Lead C) Silver D) Aluminium.

Q) For extra high voltage lines which circuit breaker is preferred A) Minimum oil circuit breaker B) SF6 gas circuit breaker C) Vacuum circuit breaker D) Bulk oil circuit breaker

The capacity of storage cell is 2.5 Ah. What is the maximum current that can supply for half hour?

The circuit whose properties are same in either direction?

Melting temperature of electrician solder is

An instruments which detects electric current flow is known as