ONLINE MCQ EE-ELECTROMAGNETIC INDUCTION 1

Q1. Air-core coils are practically free from
 A.  hysteresis losses
 [Wrong Answer]
 B.  eddy current losses
 [Wrong Answer]
 C.  both (a) and (b)
 [Correct Answer]
 D.  none of the above
 [Wrong Answer]
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Q2. For a purely inductive circuit which of
the following is true ?
 A.  Apparent power is zero
 [Wrong Answer]
 B.  Relative power is zero
 [Wrong Answer]
 C.  Actual power of the circuit is zero
 [Correct Answer]
 D.  Any capacitance even if present in
the circuit will not be charged
 [Wrong Answer]
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Q3. Find the force acting on a conductor 3m
long carrying a current of 50 amperes
at right angles to a magnetic field
having a flux density of 0.67 tesla.
 A.  100 N
 [Correct Answer]
 B.  400 N
 [Wrong Answer]
 C.  600 N
 [Wrong Answer]
 D.  1000 N
 [Wrong Answer]
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Q4. Current changing from 8 A to 12 A in
one second induced 20 volts in a coil.
The value of inductance is
 A.  5 mH
 [Wrong Answer]
 B.  10 mH
 [Wrong Answer]
 C.  5 H
 [Correct Answer]
 D.  10 H
 [Wrong Answer]
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Q5. Which of the following circuit element
stores energy in the electromagnetic
field?
 A.  Inductance
 [Correct Answer]
 B.  Condenser
 [Wrong Answer]
 C.  Variable resistor
 [Wrong Answer]
 D.  Resistance
 [Wrong Answer]
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Q6. The magnitude of the induced e.m.f. in
a conductor depends on the
 A.  flux density of the magnetic field
 [Wrong Answer]
 B.  amount of flux cut
 [Wrong Answer]
 C.  amount of flux linkages
 [Wrong Answer]
 D.  rate of change of flux-linkages
 [Correct Answer]
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Q7. Which of the following is unit of inductance?
 A.  Ohm
 [Wrong Answer]
 B.  Henry
 [Correct Answer]
 C.  Ampere turns
 [Wrong Answer]
 D.  Webers/metre
 [Wrong Answer]
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Q8. A coil with negligible resistance has 50
V across it with 10 mA. The inductive
reactance is
 A.  50 ohms
 [Wrong Answer]
 B.  500 ohms
 [Wrong Answer]
 C.  1000 ohms
 [Wrong Answer]
 D.  5000 ohms
 [Correct Answer]
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Q9. Which circuit element(s) will oppose
the change in circuit current?
 A.  Resistance only
 [Wrong Answer]
 B.  Inductance only
 [Correct Answer]
 C.  Capacitance only
 [Wrong Answer]
 D.  Inductance and capacitance
 [Wrong Answer]
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Q10. The inductance of a coil will increase
under all the following conditions
except
 A.  when more length for the same
number of turns is provided
 [Correct Answer]
 B.  when the number of turns of the coil
increase
 [Wrong Answer]
 C.  when more area for each turn is
provided
 [Wrong Answer]
 D.  when permeability of the core increases
 [Wrong Answer]
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DMRC/CIL GENERAL ENGLISH-Subject Verb Agreement Important Rules
QUIZ OF DAY-03/02/2017 GK & CURRENT AFFAIRS

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