ECET EEE Model Paper-1 Part1

 

1. The arc voltage produced in a.c circuit breaker is always

A. In phase with the arc current
B. Lagging the arc current by 90°
C. Leading the arc current by 90°
D. None of the above

Answer : Lagging the arc current by 90°
Explanation:-

2. Air break switches should be opened

A. Before the circuit breaker has opened the circuit
B. After the circuit breaker has opened the circuit
C. Along with the circuit breaker
D. None of the above

Answer : After the circuit breaker has opened the circuit
Explanation:-

3. For 220 kV electric power line the circuitbreaker performed is

A. Air blast CB
B. BOCB
C. Vaccum CB
D. AB switch

Answer : Air blast CB
Explanation:-

4. A material for good magnetic memory should have

A. Low hysteresis loss
B. High permeability
C. High retentivity
D. Low retentivity

Answer : High retentivity
Explanation:-

5. A capacitor is generally a

A. Bi-lateral and active component
B. Active, linear and non-linear component
C. Linear and bi-lateral component
D. Non-linear and active component

Answer : Linear and bi-lateral component
Explanation:-

6. Which of the following is the disadvantage due to low power factor

A. High cost of equipment for a given load
B. Poor voltage regulation
C. Increased transmission losses
D. All the above

Answer : All the above
Explanation:-

7. In railway applications which of the following circuit breaker is used

A. SF6
B. Air break
C. Minimum oil
D. Bulk oil

Answer : Air break
Explanation:-

8. Large internal faults are protected by

A. Merz price percentage differential protection
B. mho and ohm relays
C. horn gaps and temperature relays
D. earth fault and positive sequence relays

Answer : Merz price percentage differential protection
Explanation:-

9. In generating station the voltage adopted for an alternator can be

A. 104.15 kv
B. 33 kv
C. 132 kv
D. 400 kv

Answer : 33 kv
Explanation:-

10. A buchholz relay can be installed on

A. Auto-transformers
B. Air-cooled transformers
C. Welding transformers
D. Oil cooled transformers

Answer : Oil cooled transformers
Explanation:-