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1) On what factors is the rated voltage selected for an induction motor? a. Motor rating b. Starting current c. Fault levels of supply d. All of these e. None of these
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2) On what factors does the size of the induction motor depend? a. Power output b. Frequency c. Speed of rotation d. Both (A) and (C) e. All of these
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3) On what type of bearing does the heavy power electrical machine rotate? a. Ball bearing b. Sleeve bearing c. Roller bearing d. Any of these
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4) What is the temperature limit for the storage of machines at site before installation? a. Temperature above + 25 °C b. Temperature above + 5 °C c. Temperature less than 10 °C d. Temperature above 15 °C
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5) What is the main cause of harmful vibrations in the machine? a. Mechanically unbalanced rotor b. Bent or cracked shaft c. An excessively pulsating load d. All of these e. None of these
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6) Which types of bearings are used for fractional HP motors? i. Sleeve bearing ii. Ball bearing iii. Roller bearing iv. Needle bearing a. i & ii only b. ii & iii only c. iii & iv only d. i, ii, iii & iv
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7) What is / are the functions of sealing device used along with bearings? a. To prevent leakage of oil from the bearing housing b. To prevent dust, water, dirt etc from entering the bearing housing c. Both (a) and (b) d. None of these
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8) What is the maximum rated output for an engine driven synchronous generator? a. 10 MW b. 20 MW c. 50 MW d. 100 MW
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9) Which type of cooling system is preferred for turbo alternators? a. Forced air b. Hydrogen c. Water cooled d. Only (b) & (c) e. All of these
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10) Which type of rotor is used by Hydro Generators? a. Salient pole b. Cylindrical rotor c. Both (A) and (B) d. None of these
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11) Which type of rotor is designed for synchronous motor rating upto 5 kW? a. Squirrel cage rotor b. Slip ring rotor c. Salient pole rotor d. Cylindrical rotor
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12) What is / are the different type(s) of excitation system of a synchronous motor? a. Slip ring type b. Brushless type c. Both (A) and (B) d. None of these
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13) At which power angle is the pull out torque developed in the synchronous motor? a. δ = 45 ° b. δ = 30 ° c. δ = 70 ° d. δ = 90 °
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14) What type of circuits use static rectifiers? a. Circuits where storage batteries are not essential b. Circuits where storage batteries are essential c. Used in all the AC and DC circuits along with batteries d. Used in AC circuits only
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15) How is the maximum discharge current calculated? a. Maximum discharge current = (continuous load + rated voltage) / (short time load) b. Maximum discharge current = (continuous load + short time load) / (rated voltage) c. Maximum discharge current = rated voltage ( continuous load + short time load) d. Maximum discharge current = (short time load + rated voltage) / (continuous load)
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16) Which element is used as the cathode in lead acid battery? a. Sponge lead b. Lead peroxide c. Rubber mixed with lead d. None of these
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17) What is the value of open circuit voltage in a dry cell? a. 2.5 V b. 2.8 V c. 1.6 V d. 3.2 V
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18) Which charging method is employed for charging a Lead acid battery? a. Tapper charging b. Constant voltage charging c. Two rate method of charging d. All of these e. None of these
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19) Which solutions are added into the lead acid battery? a. Distilled water b. Acid water solution c. Transformer oil d. Both (a) and (b)
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20) Which connection is preferred for connecting line tap changers to transformers? a. 3 wire 3 phase AC system b. 3 wire 2 phase AC system c. 4 wire 3 phase AC system d. All of these
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