Q1:- Which of the following is the reason for copper loss in a transformer?
(A) Power loss caused by eddy current
(B) Power loss caused by resistance
(C) Power loss by counter emf
(D) Power loss by heat
(E) None of these
Answer:-B
Q2:- A half wave rectifier is suitable only for :
(A) Car radios
(B) Battery charging
(C) Variable speed AC motors
(D) Electroplating
(E) None of these
Answer:-B
Q3:- What is the inter layer insulation for small transformers?
(A) Mica
(B) Butter paper
(C) Leatheroid paper
(D) Varnish
(E) Any of these
Answer:-B
Q4:- A substance that has a high retentivity can be used for the manufacture of _______.
(A) Electromagnet
(B) Permanent magnets
(C) Temporary magnets
(D) Paramagnets
(E) None of these
Answer:-B
Q5:- An insulated conductor used in a switchboard shall be _____.
(A) Listed
(B) Flame retardant
(C) Rated not less than the voltage applied to other
conductors or busbars with which it may come in contact
(D) Both (A) and (B)
(E) All of these
Answer:-E
Q6:- Power wiring should be protected by :
(A) Switches & fuses
(B) Switches and MCB
(C) Fuses or MCB
(D) Switches or fuses
(E) None of these
Answer:-C
Q7:- Cooling of transformer is necessary to -
(A) Increase then efficiency
(B) Reduce the losses
(C) Reduce humming
(D) Reduce production cost
(E) Dissipate the heat
Answer:-D
Q8:- In a 220 V DC machine, the shunt field resistance is found to be 440 ohms. What is the value of the shunt field current?
(A) 0.2 A
(B) 0.5 A
(C) 2.0 A
(D) 5.0 A
(E) 1.0 A
Answer:-B
Q9:- The function of interpoles in a D.C. machine is to -
(A) Reduce field winding heating
(B) Improve commutation
(C) Reduce losses
(D) Compensate for air gap variation
(E) All of these
Answer:-B
Q10:- Potential transformers are used to connect ______ .
(A) Voltmeters to the transformer primary
(B) Instruments to busbar of distribution panel
(C) Voltmeter to high voltage lines
(D) Energy meters to low-voltage lines
(E) None of these
Answer:-C
(A) Power loss caused by eddy current
(B) Power loss caused by resistance
(C) Power loss by counter emf
(D) Power loss by heat
(E) None of these
Answer:-B
Q2:- A half wave rectifier is suitable only for :
(A) Car radios
(B) Battery charging
(C) Variable speed AC motors
(D) Electroplating
(E) None of these
Answer:-B
Q3:- What is the inter layer insulation for small transformers?
(A) Mica
(B) Butter paper
(C) Leatheroid paper
(D) Varnish
(E) Any of these
Answer:-B
Q4:- A substance that has a high retentivity can be used for the manufacture of _______.
(A) Electromagnet
(B) Permanent magnets
(C) Temporary magnets
(D) Paramagnets
(E) None of these
Answer:-B
Q5:- An insulated conductor used in a switchboard shall be _____.
(A) Listed
(B) Flame retardant
(C) Rated not less than the voltage applied to other
conductors or busbars with which it may come in contact
(D) Both (A) and (B)
(E) All of these
Answer:-E
Q6:- Power wiring should be protected by :
(A) Switches & fuses
(B) Switches and MCB
(C) Fuses or MCB
(D) Switches or fuses
(E) None of these
Answer:-C
Q7:- Cooling of transformer is necessary to -
(A) Increase then efficiency
(B) Reduce the losses
(C) Reduce humming
(D) Reduce production cost
(E) Dissipate the heat
Answer:-D
Q8:- In a 220 V DC machine, the shunt field resistance is found to be 440 ohms. What is the value of the shunt field current?
(A) 0.2 A
(B) 0.5 A
(C) 2.0 A
(D) 5.0 A
(E) 1.0 A
Answer:-B
Q9:- The function of interpoles in a D.C. machine is to -
(A) Reduce field winding heating
(B) Improve commutation
(C) Reduce losses
(D) Compensate for air gap variation
(E) All of these
Answer:-B
Q10:- Potential transformers are used to connect ______ .
(A) Voltmeters to the transformer primary
(B) Instruments to busbar of distribution panel
(C) Voltmeter to high voltage lines
(D) Energy meters to low-voltage lines
(E) None of these
Answer:-C
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