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Electrical Engineering Objective Questions { Basic Concept of Electricity }

99. When a single turn coil rotates in a uniform magnetic field, at uniform speed the induced emf will be
A. alternating
B. steady
C. pulsating
D. none of these

100. Principle of dynamically induced emf is used in a
A. choke
B. transformer
C. generator
D. thermo-couple

101. The direction of dynamically induced emf in a conductor can be determined by
A. Fleming's left hand rule
B. Fleming's right hand rule
C. Helix rule
D. Cork screw rule

102. There is a constant homogeneous magnetic field pointing in a vertical direction. A metallic wire in the form of a square is rotated about a horizontal axis passing through the middle points of its opposite arms. The emf generated in the square is
A. zero
B. finite and constant
C. oscillatory
D. varying with time t as t2.

103. Principle of statically induced emf is used in
A. transformer
B. motor
C. generator
D. battery

104. The property of a coil by which a counter emf is induced in it, when the current through the coil changes, is known as
A. self inductance
B. mutual inductance
C. capacitance
D. none of these

105. The mutual inductance between two closely coupled coils is 1 H. Now the turns of one coil are decreased to half and those of the other are doubled. The new value of mutual inductance would be
A. 2 H
C. H
D. 1 H

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