A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Current is converted to voltage :
A. through a voltmeter
B. through a resistance
C. through an ammeter
D. through a galvanometer
2. How many colours does copper UTP wiring have?
A. 6
B. 7
C. 8
D. 10
3. Digital multimeter is used for
A. measuring AC and DC current, voltage and resistance
B. measuring AC current and voltage
C. measuring DC current and resistance
D. measuring AC voltage and resistance
4. Which of the following circuit breakers is generally used in railway electrification?
A. Air blast circuit breaker
B. Minimum oil circuit breaker
C. Bulk oil circuit breaker
D. Sulphur hexafloride SF6 circuit breaker
5. Digital circuit can be made by the repeated use of ………………
A. OR gates
B. NOT gates
C. NAND gates
D. None of the above
6. Decimal 43 in hexadecimal and BCD number system is respectively……. and ……..
A. B2 and 01000011
B. 2B and 01000011
C. 2B and 00110100
D. B2 and 01000100
7. Ground resistance should be designed such that :
A. Grounding resistance should be as low as possible
B. Grounding resistance should be as high as possible
C. Grounding resistance should always be zero
D. None of these
8. What are the minimum requirements to cause the flow of current?
A. A voltage source and a conductor.
B. A voltage source, a conductor and an insulator.
C. A voltage source, a switch and a resistor.
D. A conductor, an insulator and a resistor.
9. Selection of the type of conduit depends upon the :
A. Type of location, outdoor or indoor
B. Type of atmosphere and estimated cost
C. Expected working temperature & allowable weight of conduit runs
D. All these
10. Backpitch in wave and lap winding is equal to :
A. Coil pitch
B. Average pitch
C. Cummulator pitch
D. Resultant poitch
11. Starter contacts are indicated either for their position or for their function. In such a case normally closed contact means that they are :
A. In closed condition in all the status of relay
B. Open when the relay coil is de-energised
C. Open when the relay coil is energised
D. Closed when the relay coil is energised
12. To compensate lower value of old resistance of filament, which of the following is connected in series with the serial set?
A. NTC thermister
B. PTC thermister
C. Voltage dependant resister
D. flasher
13. Check list for Job Safety Analysis (JSA) consists of
A. Work area, material, machine, tools
B. Men, machine, material, tools
C. Men, machine, work area, tools
D. Men, work area; Material, tools
14. Main purpose of oil in OCB is to :
A. Provide insulation
B. Provide cooling of contacts
C. Quenching arc
D. None of these
15. If two conductors carrying currents in opposite direction are placed parallel to each other then the magnetic fields set up by the conductors
A. Attract each other
B. Repel each other
C. Perpendicular to each other
D. Parallel to each other
16. Which one of the following is not standard cable size?
A. 6 mm2
B. 10 mm2
C. 12 mm2
D. 25 mm2
17. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is ….
A. 2 and 7
B. 3 and 7
C. 1 and 6
D. 3 and 6
18. A single phase ac - dc converter is also known as
A. rectifier
B. inverter
C. chopper
D. regulator
19. Which effect of the electric current is utilized in a filament lamp?
A. The heating effect.
B. The magnetic effect.
C. The collision ionization of the gases.
D. The chemical effect.
20. AC voltages are measured using :
A. oscillators and op amps
B. rectifiers and filters
C. resistor and capacitor
D. inductor and resistor
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