TS ECET EEE 2016-3

1. When the rate of electrical energy is charged on the basis of maximum demand of the consumer and the units consumed is called

A. Simple tariff
B. Flat rate tariff
C. Two part tariff
D. Power factor tariff

Answer : Two part tariff
Explanation:-

2. The purpose of the moderator in a nuclear power plant is to control the

A. Flow of water inlet
B. Amount of nuclear fuel into the reactor
C. Nuclear fission rate by slowing down the neutrons
D. Control the steam flow to the turbine

Answer : Nuclear fission rate by slowing down the neutrons
Explanation:-

3. The ratio of average load to the maximum demand during a given period is known as

A. Load factor
B. Demand factor
C. Diversity factor
D. Plant capacity factor

Answer : Load factor
Explain:-

4. The device that detects the fault in a power system is

A. Circuit breaker
B. Isolator
C. Relay
D. Earthing switch

Answer : Relay
Explain:- Relay detects the fault and sends signal to the Circuit breaker to isolate the Power system from faults

5. The Buchholz relay is normally used for the protection of the following equipment

A. Transformer
B. Alternator
C. Bus-bar
D. Transmission line

Answer : Transformer
Explanation:- The Buchholz relay is used in transformer to detect the internal faults

6. An over-current relay having current setting of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pickup current is

A. 6.25 A
B. 12.5 A
C. 25/5 A
D. 25 A

Answer : 6.25 A
Explanation:- Given Current setting=125%
CT Ratio=400/5A
Pickup current=Rated secondary current of CT × Current setting
=5×(125/100)
= 6.25 A

7. A 110 V I 220 V single phase transformer is to be protected by a differential protection. If the CT ratio on primary side (LV side) is 50/5 A, then suitable CT ratio on the HV side is

A. 100/5 A
B. 200/5 A
C. 3.125 A
D. 12.5/5 A

Answer : 3.125 A
Explain:-

8. The distance relay normally used for the protection medium lines is

A. Impedance relay
B. Reactance relay
C. Mho relay
D. IDMT relay

Answer : Impedance relay
Explain:- Impedance relay operates when the line impedance value is lower than the predefined impedance value

9. For the same power rating, which of the following circuit breaker is least in size

A. Oil circuit breaker
B. Air-blast circuit breaker
C. Vacuum circuit breaker
D. SF6 circuit breaker

Answer : SF6 circuit breaker
Explain:-

10. ACSR (Aluminum conductor steel reinforced) are employed as overhead conductors because of (a) Lightness (b) Electrical conductivity (c) restlessness

A. (a) and (b) only
B. (b) and (c) only
C. (c) and (a)
D. (a), and (c)

Answer : (a), and (c)
Explain:-