ECET EEE 2010-6

1. The maximum demand of a consumers is 2 2KW and his daily energy consumption is 20units. His load factor is

A) 10%
B) 41.6%
C) 50%
D) 100%

Answer : 10%
Explanation:-

2. Mho Relay is normally used for the protection of

A) long transmission lines
B) medium transmission lines
C) short length lines
D) No length criterion

Answer : Long transmission lines
Explanation:-

3. The Buchholz relay protects a transformer from

A) All types of internal faults
B) A turn to turn fault
C) winding to winding faults
D) Line to line faults

Answer : All types of internal faults
Explanation:-

4. It is always economical to improve the PF of an installation to

A) Zero
B) Unity
C) A Little less than unity lag
D) A little less than unity lag

Answer : A Little less than unity lag
Explanation:-

5. The main criterion for the Design of a distributor is

A) The voltage drop
B) Corona loss
C) Temperature rise
D) Radio interference

Answer : The voltage drop
Explanation:-

6. Auto reclosing is used in case of

A) Lighting arrestor
B) Air blast Circuit breaker
C) Bulk oil C.B
D) Minimum oil C.B

Answer : Air blast Circuit breaker
Explanation:-

7. The unit protection scheme provides

A) Back up protection
B) Remote protection
C) Simultaneos protection
D) Primary protection

Answer : Back up protection
Explanation:-

8. Lightning arrestors are used in power systems to prevent electrical equipment against

A) Direct strokes of lightning
B) Power frequency voltages
C) Over voltages due to indirect lightning strokes
D) over currents due to lightning strokes

Answer : Over voltages due to indirect lightning strokes
Explanation:-

9. A reactor is a coil which has

A) Low inductive reactance and high resistance
B) High inductive and low resistance
C) Low inductive reactance and resistance
D) inductive reactance and resistance are same

Answer : High inductive and low resistance
Explanation:-

10. To reduce short circuit currents ________ are used

A) Resistors
B) Reactors
C) Capacitors
D) Resistor and reactor in series and in parallel with capacitors

Answer : Reactors
Explanation:-