A. The
colour of dry silica gel is
1. Pale white
2. Pale pink
3. Pale green
4.Ocean blue
B. Dc motor that runs approximately at constant speed is
1. Shunt motor
2. Series motor
3. Differential compound motor
4. All of the above
C. A tap changer is used in a transformer to
1. \Adjustment of both primary and secondary voltage
2. Adjust secondary voltage
3. change primary voltage
4. change in power factor
D. A motor generally used in toys is
1. Shaded pole motor
2. Hysteresis motor
3. BLDC
4. Reluctance motor
E. Laminations are used in armature of DC Machine to
1. Improve heat conduction
2. Reduce volume
3. Reduce eddy current losses
4. Increase air movement
F. Electric trains in India run on AC supply,The voltage level used in traction is
1. 25 KV AC
2. 33 KV AC
3. 11 KV AC
4. 415 VAC
G. Due to skin effect
1. Effective resistance decreases
2. Increases Reactance
3. Effective resistance Increases
4. Reactance decreases
H. With Increase in frequency of
transmission line
1. No change in line resistance occurs
2. line resistance Increases
3. line resistance
4. Decrease in line series reactance occurs
I. Commutator of the d.c. generator is subjected to sparking due to
1. Low armature resistance
2. High resistance of Carbon brushes
3. More reactance voltage
4. None of the above.
J. In a transformer running continuously the maximum temperature rise occurs in
1. The windings
2. The core
3. The transformer oil
4. The radiator
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