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Basic Wiring Practice MCQ:

This types of Basic Wiring Practice MCQ question and answer helpful for students:

1)   What is the maximum number of lighting points that can be connected in a circuit?

a. 5
b. 10
c. 8
d. 12

Ans. b

2)   Which among these is a method of wiring?

a. Joint box
b. Tee system
c. Loop in system
d. Only a and c
e. All of these

Ans. e

3)   Which material is used for wiring continuous bus bar?

a. Aluminium
b. Copper
c. Both (A) and (B)
d. None of these

Ans. a

4)   What is the maximum load that can be connected in a circuit connecting only lighting points?

a. 500 watts
b. 750 watts
c. 800 watts
d. 1000 watts

Ans. C

5)   For what voltage levels are the screwed conduit circuits used?

a. Less than 250 V
b. For voltages between 250 V – 600 V
c. For voltages above 600 V
d. None of these

Ans. b

6) For painful shock, what is the range of electric shock current at 50Hz?

a.3-5 mA
b.5-10 mA
c.0-3 mA
d.0-1 mA

Ans. b

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Top 100 MCQ Battery

Battery: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY & Others competitive]-mcq of battery

1.When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in

1. charged state
2. discharged state
3. both (A) and (B)
4. active state

Ans . B

2.during charging the specific gravity of the electrolyte of a lead-acid battery

1. increases
2. decreases
3. remains the same
4. becomes zero

Ans . A

3.While preparing electrolyte for a lead-acid battery

1. water is poured into acid
2. acid is poured into water
3. anyone of the two can be added to other chemical
4. none of the above

Ans . B

4.The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is

1. just one
2. always greater than one
3. always less than one
4. none of the above

Ans . B

5.Electrolyte used in a lead-acid cell is

1. NaOH
2. only H₂SO₄
3. only water
4. dilute H₂SO₄

Ans . D

6. Shelf life of a small dry cell is

A. equal to that of large dry cell
B. less than that of large dry cell
C. more than that of large dry cell
D. none of the above
Ans. B

7. The best indication about the state of charge on a lead-acid battery is given by

A. output voltage
B. temperature of electrolyte
C. specific gravity of electrolyte
D. none of the above
Ans. C

8. Each cell has a vent cap

A. to allow gases out when the cell is on charge
B. to add water to the cell if needed
C. to check the level of electrolyte
D. to do all above functions
Ans. D

9. The capacity of a lead-acid cell is measured in

A. amperes
B. ampere-hours
C. watts
D. watt-hours
Ans. B

10. The watt-hour efficiency of a lead-acid cell varies between

A. 25 to 35%
B. 40 to 60%
C. 70 to 80%
D. 90 to 95%
Ans. c

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Switchgear and Protection : [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY & Others competitive]-mcq of switchgear and protections

1.Outdoor switchgear is generally used for voltage beyond

A. 11 KV
B. 33 KV
C. 66 KV
D. 132 KV

Ans. C

2.The least expensive protection for over current in low-voltage system is

A. Rewirable fuse
B. Isolator
C. Circuit breaker
D. Air-break switch

Ans. A

3.Purpose of backup protection is

A. To increase the speed
B. To increase a reach
C. To leave no blind spot
D. To guard against failure of primary

Ans. D

4.We do not require any protection against prime mover failure in case of

A. Turbo generator sets
B. Hydro generator sets
C. Diesel engine driven alternators
D. Back pressure turbo generators

Ans. A

5.For the protection of stator winding of an alternate against internal fault involving ground the relay used is a

A. Biased differential relay
B. Directional over-current relay
C. Plain impedance relay
D. Buchholz relay

Ans. A

6.For the protection of a large squirrel cage induction motor against single phase normally

A. An over-current relay is used
B. Differential relay is used
C. Directional relay is used
D. Negative sequence current sensitive relay is used

Ans. D

7.The most commonly used method for the protection of three phase feeder is

B. Differential protection
C. Reverse power protection
D. None of the above

Ans. B

8.Which is the pilotless protection method for feeder line ?

A. Differential protection
B. Carrier current protection
C. Time credit protection
D. None of the above

Ans. B

9.Time graded protection of a radial feeder can be achieved by using

A. Definite time relay
B. Inverse time relay
C. Both definite and inverse time relays
D. None of the above

Ans. C

10.  Pilot-wire protection scheme is the most economical and provides high speed relaying for

A. Short length of lines upto 15 km
B. Medium length of lives up to 60 km
C. Long length of lines up to 200 km
D. All of the above

Ans. A

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Top 100 MCQ Capacitor

1). ___________ stores charge

•
•
•

Ans- a

2). The parallel metal plates of the capacitor separated by ________

Ans- a
3). The nominal capacitance of the paper capacitors is around ________

Ans- c