Rajasthan Technical Education Second Year Paper 2016 – Industrial Electrical and Electronics

Rajasthan Technical Education Second Year Paper 2016 – Industrial Electrical and Electronics

Core of transformer is made of
(a) Copper
(b) Aluminium
(c) Cast Iron
(d) Silicon Steel

Copper losses of transformer depends upon
(a) load voltage
(b) load current
(c) primary voltage
(d) primary current

In which part of transformer hysteresis loss is occur ?
(a) primary winding
(b) core
(c) secondary winding
(d) insulating part

Commutator of a DC machine is made of
(a) Aluminium
(b) Iron
(c) Hard copper
(d) Steel

Series field winding is made of
(a) Thin wire and small number of turns
(b) Thick wire and large number of turns
(c) Thin wire and large number of turns
(d) Thick wire and small number of turns

Function of commutator in DC machine is
(a) speed control
(b) Improvement in commutation process
(c) to convert alternating current to direct current
(d) to convert alternating voltage to direct voltage

Direction of rotation of armature in d.c. shunt motor can be changed by
(a) By interchanging armature terminals
(b) By interchanging field winding terminals
(c) Above (a) & (b)
(d) None of the above

Critical resistance of a DC generator is
(a) Brush Resistance
(b) Field winding Resistance
(c) Armature Resistance
(d) Interpoles Resistance

Reason of laminated stator core in induction motor is
(a) to reduce eddy current losses
(b) to reduce hysteresis losses
(c) to reduce copper losses
(d) None of the above

Actual speed of an induction motor having 4% slip and 1500 RPM synchronous speed is
(a) 1440 RPM
(b) 1480 RPM
(c) 1500 RPM
(d) 600 RPM

Rotor voltage frequency of an induction motor having 2% slip and 50 Hz frequency is
(a) 100 Hz
(b) 1 Hz
(c) 10 Hz
(d) 20 Hz

Following protection is NOT available in D.O.L starter
(a) over current protection
(b) no-volt protection
(c) to reduce starting current
(d) single phasing protection