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RRB JOBS QUESTION BANK : JUNIOR ENGINEER (NON-AC) SELECT THE CORRECT ANSWERS
QUESTION BANK FOR SELECTION TO THE POST OF JUNIOR ENGINEER (NON-AC)
Part – B
(POWER)
SELECT THE CORRECT ANSWER:
1) Name of the meter used to measure Air velocity (c)
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a. b. |
Multi meter Anemometer |
c. d. |
Thermometer Ammeter |
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2) Name the Electrolyte used in lead acid cells (a) |
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a. b. |
Sulpheric Acid Hydrochloric Acid |
c. d. |
Nitric acid Phasphoric Acid |
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3) Inverter converts (a) |
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a. |
DC to AC |
c. |
AC to AC |
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b. |
DC to DC |
d. |
AC to DC |
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4) Capacitor bank are used at substations to (c) |
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a. b. |
Avoid short-circuiting Improve load factor |
c. d. |
Improve P.F Supply power in emergency |
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5) Circuit breaker is (a) |
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a. b. |
Current breaking device Attention device |
c. d. |
Amplifier Starting device |
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6) PSI is the unit of (a) |
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a. b. |
Pressure Temperature |
c. d. |
Humidity Velocity of gas |
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7) Rectifier converts (b) |
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a. b. |
DC to AC AC to DC |
c. d. |
AC to AC DC to DC |
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8) Maximum permissible value of Earth Resistance for a small sub-stn? (c) |
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a. |
0.5 Ω |
c |
2.0 Ω |
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b |
1.0 Ω |
d |
8.0 Ω |
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9) Medium Voltage is clarified as (d) |
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a b |
Less than 250V 650V to 33KV |
c d |
Above 33KV 250V to 650V |
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10) Single Phasing preventer is used to prevent? (c) |
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a c |
Single Phase voltage Motors from single phasing |
b d |
Three phase voltage Motor to start |
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11) What is the minimum safe value of insulation resistance for Motors? (a) |
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a c |
10 M Ω 5 M Ω |
b d |
15 M Ω 20 M Ω |
(b) |
12) The dimensions of earth electrode?
a 3.0 mtr length x 40 mm dia x 3.2mm thick b 2.5 mtrs length x 50mm dia x 3.2mm thick y
c 3.0 mtrs length x 50mm dia x 3.2mm thick d 2.5mtrs length x 40mm dia x 3.2mm thick
13) Earth Megger used ( d )
a To measure insulation resistance of cables b To measure voltage
c To measure current d To measure insulation resistance of earth
14) Illumination levels measured by ( a )
a Lux Meter b Hydrometer
c Anemometer c Multimeter
A Generation, Transmission & Distribution of Electrical Energy
15) The integration time employed by supply authorities for recording M.D. for a 33 kV/415 V, 10 MVA Sub-station is – (c)
a 5 minutes b 15 minutes
C 45 minutes d 60 minutes
16) While designing a sub-station anticipated future loads in the next…. Years are taken: ( d )
a 1 year b 2 years
c 20 years d 5-7 years
17) As per the present Tariff the minimum power factor of sub-station should be ( c )
a 0.8 b 0.85
c 0.98 d 0.95
18) The 3 phase voltage unbalance in supply should not exceed ( a )
a 2.5% to 5% b 20%
c 25% d 10%
19) For maintaining power supply quality the rate of change of frequency should not exceed (c)
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Study Kit for Railway Recruitment Board (RRB) Exams
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