Rajasthan Technical Education Second Year Paper 2016 – Electrical & Electronics Engineering

Rajasthan Technical Education Second Year Paper 2016 – Electrical & Electronics Engineering

An electric motor is used for
(a) generating electric energy
(b) changing mechanical energy to electric energy
(c) changing electrical energy to mechanical energy
(d) None of the above

The brushes of d.c. machine are made of
(a) Brass
(b) Carbon
(c) Iron
(d) Mica

The e.m.f induced in the armature of d.c. motor is
(a) Back e.m.f
(b) self induced e.m.f
(c) Mutually induced e.m.f
(d) None of these

The principle of operation of transformer is based on
(a) Self induction
(b) Mutual induction
(c) Static induction
(d) Dynamic induction

The efficiency of transformer is
(a) 50%
(b) 60%
(c) 80%
(d) 95%

For step-down transformer the transformation ratio is
(a) less than one
(b) equal to one
(c) more than one
(d) Zero

The speed of rotor of an induction motor is always __________synchronous speed.
(a) equal to
(b) more than
(c) less than
(d) half of

A three phase induction motor works with
(a) d.c. only
(b) a.c. only
(c) a.c. and d.c both
(d) None of these

At start, the slip of induction motor is
(a) zero
(b) one
(c) 0.5
(d) 2

Which of following motors is used for rolling mills ?
(a) Squirrel cage induction motor
(b) Single phase induction motor
(c) D.C motor
(d) Slip ring induction motor

Which of the following machine has heavy fluctuating load ?
(a) Planner
(b) Lathe
(c) Punching machine
(d) Printing machine

Which of the advantage of electric heating ?
(a) Free from dirt
(b) Absence of flue gas
(c) Temperature control
(d) All of the above

In indirect heating method, maximum heat transfer takes place by
(a) Conduction
(b) Convection
(c) Radiation
(d) None of the above

The material of the heating element for a furnace should have
(a) higher melting point
(b) lower melting point
(c) high specific resistance
(d) All of the above

Candela is the unit of
(a) Luminous intensity
(b) Luminous flux
(c) Wavelength
(d) frequency