Electrician Theory Paper I semester-III [1st August 2017 Back Subjects] with Answer Key

Electrician Theory Paper I semester-III [1st August 2017 Back Subjects

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Note:- Attempt all the questions.
           All questions carry equal marks.
           This paper carries negative marking. 25% marks will be deducted for each wrong answer.

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Choose the correct answer:

Q.1) Which of the following devices does not belong to the transistor family?
A) IGBT
B) MOSFET
C) GTO
D) BJT
Answer: C) GTO

Q.2) A power transistor is a -
A) Three layer, three junction device
B) Three layer, Two junction device
C) Two layer, One Junction device
D) Four layer, three junction device
Answer: B) Three layer, Two junction device

Q.3) In a power transistor, ____ is the controlled parameter. 
A) VBE
B) VCE
C) IB
D) IC

Answer: D) IC

Q.4) An SCR behaves as a ......... Switch.
A) Unidirectional
B) Bidirectional
C) Mechanical
D) None of these
Answer: A) Unidirectional

Q.7) Identify the symbol-

A) SCS
B) PUT
C) LASCR
D) Diac
Answer: A) SCS

Q.8) The .... can be externally programmed to turn on at a despaired anode to gate voltage level.
A) UJT
B) PUT
C) SCR
D) SCS
Answer: B) PUT

Q.9) The frequency of the induced emf in an induction motor is -
A) Greater than the supply frequency
B) Lesser than the supply frequency
C) Same as the supply frequency
D) None of these
Answer: C) Same as the supply frequency

Q.10) The advantage of skewing in induction motor is / are -
A) Motor runs smoothly as the magnetic hum is reduced
B) The tendency of the rotor teeth to remain under the stator teeth due to direct magnetic attraction is reduced.
C) More uniform torque is obtained while running
D) All of these
Answer: D) All of these

Q.11) Which relay is used for feeders?
A) MHO relay
B) Translay relay
C) Merz price protection
D) Buchholz relay
Answer: B) Translay relay

Q.12) Which of the following relays is used on transformers?
A) Buchholz relay
B) MHO relay
C) Transmission Lines
D) Feeders
Answer: A) Buchholz relay

Q.13) MHO relay is used for -
A) Rectifiers
B) Circuit breakers
C) Transmission Lines
D) Feeders
Answer: C) Transmission Lines

Q.14) Which of the following is not a part of the circuit breaker?
A) Explosion pot
B) Fixed and moving contacts
C) Conservator
D) Operating mechanism
Answer: C) Conservator

Q.15) A circuit breaker will normally operate -
A) When the switch is put on
B) When the line is to be checked
C) When the power is to be supplied
D) Whenever fault in the lines occurs
Answer: D) Whenever fault in the lines occurs

16) LED lamp has a power factor -
A) Unity
B) Leading
C) Lagging
D) None of these
Answer: B) Leading

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