SSC JE / State Electricity Boards JE Electrical Exams QUIZ-13

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Question 1

A 18.65 kW, 220 V, 50 Hz, 4-pole, Y-connected synchronous motor is running with a light load. The load angle is 4^o(elect.) and back e.m.f. generated per phase in 110 V. If the armature resistance per phase is 0.1Ω and synchronous reactance/ phase is 1.5Ω then resultant armature voltage/phase is ……………….

• A5.4 V
• B18.9 V
• C72.4 V
• D26.8 V

Question 2

The demand for a large increase in torque of a d.c. shunt motor is met by a………….

• Alarge decrease in speed
• Blarge increase in speed
• Clarge increase in current
• Dsmall increase in current

Question 3

A generating plant has a maximum capacity of 100 kW and costs Rs. 1,60,000. The annual fixed charges are 12%. If the load factor is 50%, the fixed charges per kWh will be

• A5.24 paise
• B7.82 paise
• C4.38 paise
• D3.82 paise

Question 4

The acceptable value of grounding resistance to domestic application is

• A0.1 Ω
• B1 Ω
• C10 Ω
• D100 Ω

Question 5

Referring to Fig., wattmeter reads while wattmeter reads What is the power of the load?

• A
• B
• C
• D

Question 6

The current in resistor in Figure by converting the current source into voltage source is

• A10 mA
• B12 mA
• C6 mA
• D5 mA

Question 7

As compared to full-wave rectifier using two diodes, the four diode bridge rectifier has the dominant advantage of:

• AHigher efficiency
• BHigher current carrying capacity
• CLower peak inverse voltage requirement
• DLower ripple factor

Question 8

A dielectric is introduced between the plates of a capacitor kept at a constant potential difference. The capacitance of the capacitor

• Aincreases
• Bremains the same
• Cdecreases
• Dnone of the above

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