Electrician Theory Test 1 II Year

ELECTRICIAN Theory II YEAR TEST 1

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1) What is the reason for DC generator fails to build up voltage?

A) Loose brush contact

B) Prime mover is running at above rated speed

C) Field resistance is above critical resistance

D) Armature resistance is more

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2) Which type of test is illustrated for the armature after rewound

A) Shorted coil test

B) Grounded coil test

C) Voltage drop test

D) Open coil test

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3) How many parallel paths in duplex lap winding of a 4 pole DC generator?

A) 12

B) 8

C) 6

D) 4

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4) What is the name of D.C motor?

A) D.C differential compound motor

B) D.C cumulative compound motor

C) D.C shunt motor

D) D.C series motor

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5) Which type of instrument is used to test the armature winding?

A) Growler

B) Multimeter

C) Ohmmeter

D) Megger

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6) What is the formula to calculate the current taken by D.C shunt motor armature?

A) 𝐸𝑏 𝐼𝑎= -------- 𝑅𝑎

B) 𝑉 𝐼𝑎= -------- 𝑅𝑎

C) 𝑉−𝐸𝑏 𝐼𝑎= -------- 𝑅𝑎

D) 𝑉+𝐸𝑏 𝐼𝑎=-------- 𝑅𝑎

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7) What is the effect, if a four point starter resistance is cutoff during running?

A) Runs at slow speed

B) Runs at reverse direction

C) Runs at very high speed

D) Motor stopped

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8) Name the type of DC motor.

A) Series motor

B) Shunt motor

C) Long shunt compound motor

D) Short shunt compound motor

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9) What is the name of the speed control method of DC motor?

A) Armature diverter method

B) Voltage control method

C) Field diverter method

D) Field tapping method

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10) Which speed control method of D.C series motor is used for electric train?

A) Supply voltage control method

B) Field diverter method

C) Field tapping method

D) Armature diverter method

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11) What is the name of generator, if its field is connected in parallel with armature?

A) Compound generator

B) Shunt generator

C) Self excited generator

D) Series generator

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12) Which rule determines the direction of rotation of armature in D.C motor?

A) Fleming’s left hand rule

B) Right hand palm rule

C) Fleming’s right hand rule

D) Right hand grip rule

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13) Which speed control methods offers below normal speed in DC shunt motor?

A) Voltage control method

B) Ward Leonard system of speed control

C) Field control method

D) Armature control method

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14) Which material is used for starting resistance of DC starters?

A) Constantine

B) Eureka

C) Nichrome

D) Manganin

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15) What is the operation in the rewinding process?

A) Cleaning of slots

B) Removing of winding

C) Removing of wedges

D) Cutting of winding wire

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16) What is the name of D.C generator field?

A) Cumulative compound generator

B) What is the principle of D.C generator?

C) Short shunt compound generator

D) Long shunt compound generator

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17) What is the name of the D.C generator?

A) Compound generator

B) Series generator

C) Separately excited generator

D) Shunt generator

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18) How No volt coil is connected in a three point starter with DC shunt motor?

A) Connected in series with armature

B) Connected in series with shunt field

C) Directly connected to supply

D) Connected in parallel with armature

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19) Which speed control method is used in food mixturem otors?

A) Field diverter control method

B) Armature diverter method

C) Series field tapping method

D) Armature diverter metho

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20) Which method of speed control gives below the rated speed in DC series motor?

A) Tapped field method

B) Voltage control method

C) Field diverter method

D) Armature diverter method

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