(A) Induced emf of a motor
(B) Back emf of a motor
(C) emf
(D) Forward emf of battery
Author:
Slip rings are used in:
(A) A.C. Dynmo
(B) D.C. Dynmo
(C) Rectifier
(D) Electric Motor
The relation for emf induced in an A.C. generator can be expressed by:
(A) ε = εo cos (ωt)
(B) ε = εo sin (ωt)
(C) ε = εo tan (ωt)
(D) ε = εo / sin (ωt)
The ‘land of eternal spring’ are certain parts of:
(A) Tundra region
(B) Highland region
(C) Mediterranean region
(D) Hot Wet Equatorial region
__ grasses are known as elephant grasses.
(A) Prairie
(B) Steppe
(C) Savannah
(D) Llanos
Uranus takes __ years to orbit the Sun.
(A) 48
(B) 84
(C) 50
(D) 60
In which country will you find the river Po?
(A) China
(B) Italy
(C) Sri Lanka
(D) Zambia
The Earth’s population has __ since the turn of the century.
(A) stayed the same
(B) doubled
(C) trebled
(D) multiplied ten times