Quiz: Electrical Engineering 07 Dec 2020

Quiz: Electrical Engineering
Exam: SSC-JE
Topic: Miscellaneous

Each question carries 1 mark.
Negative marking: 1/4 mark
Time: 10 Minute

Q1. Which part of DC machines converts the alternating current induced in armature conductors into unidirectional current in the external load circuit?
(a) Pole coils
(b) Commutator
(c) Armature windings
(d) Armature core

Q2. Power transformers are generally designed to have maximum efficiency around
(a) No load
(b) Half load
(c) Near full load
(d) None of the above

Q3. A circuit is disconnected by isolators, when:
(a) Circuit breaker is not open
(b) Line is energized
(c) Line is on full load
(d) There is no current in the line

Q4. In DC machines, the main parts where core losses significantly occur at:
(a) The armature only
(b) The pole faces only
(c) Both the armature and pole faces
(d) The yoke only

Q5. Conductors, which connects the consumer’s terminal to distribution line is known as…
(a) Feeders
(b) Service-mains
(c) Distributors
(d) General cables

Q6. What will be the reading of megger, if the measuring terminals are open circuited?
(a) 500 Ω
(b) 1000 Ω
(c) Zero
(d) Infinity

Q7. In PMMC instruments, damping torque is provided by:
(a) Eddy currents
(b) Air friction
(c) Fluid friction
(d) Thermal effect

Q8. In 3-phase induction motor the mechanical power developed in terms of air-gap power(Pag) is:
(a) (1-s) Pag
(b) (s-1) Pag
(c) Pag/((1-s))
(d) Pag/s

Q9. Determine the current through the 5Ω resistor in the figure given below utilizing Thevenin’s theorem.

(a) 2A
(b) 3A
(c) 0A
(d) 1A

Q10. Thin laminations are used in a machine in order to reduce
(a) Eddy current losses
(b) Hysteresis losses
(c) Both a and b
(d) None of the above

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