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MCQs 1: In a gas filled lamp, inert gases are filled in the lamp to

Compensate heat losses Minimize the electricity use Increase the brightness None of these
Answer Explanation

MCQs 2: If the length of the filament is increased then the

Power also increases Power decreases Required oxygen increases Flow of current increases
Answer Explanation

MCQs 3: The tube of a tube light is filled with

Fluorescent paste Low pressure inert gas Mercury Only (b) and (c)
Answer Explanation

MCQs 4: Electric bell consists of a

Horse shoe type electromagnet Circular electromagnet Rod shaped electromagnet All of these
Answer Explanation

MCQs 5: In cell, the current flows in outer circuit from

Positive terminal to negative terminal and electrons from negative terminal to positive terminal Positive terminal to negative terminal and electrons from positive terminal to negative terminal Negative terminal to positive terminal and electrons from negative terminal to positive terminal Negative terminal to positive terminal and electrons from positive terminal to negative terminal
Answer Explanation

MCQs 6: Leclanche cell Daniel cell is an example of

both dry cell both wet cell dry cell, wet cell wet cell, dry cell
Answer Explanation

MCQs 7: Secondary’s cells are

lead acid cell alkaline cell both (a) and (b) none of these
Answer Explanation

MCQs 8: In voltaic cell, anode and cathode of the cell is

copper electrode, zinc zinc, copper aluminium, zinc nickel, cobalt
Answer Explanation

MCQs 9: In Daniel cell,

Layer of hydrogen bubbles is formed Polarization takes place Negative pole is a copper vessel None of these
Answer Explanation

MCQs 10: For controlling the initial inrush current,

Reduced voltage is applied to the stator during the starting period Reduced voltage is applied to the stator when the motor is running at rated speed Either (a) or (b) None of these
Answer Explanation

MCQs 11: In India, direct - on - line starter can be used for 3 - phase squirrel cage induction motor up to the rating of

5 HP 10 HP 15 HP 25 HP
Answer Explanation

MCQs 12: Reduced voltage can be applied across the stator circuit by

Using an autotransformer Connecting resistor in series with stator winding Connecting inductor in series with stator winding All of these
Answer Explanation

MCQs 13: If an induction motor is initially connected in delta and then reconnected in star then the current drawn will become

Thrice of the current drawn when connected in delta Twice of the current drawn when connected in delta One third of the current drawn when connected in delta Half of the current drawn when connected in delta
Answer Explanation

MCQs 14: If an extra resistance is connected in the rotor circuit of slip ring induction motor, then

Starting current and torque decreases Starting current increases and torque decreases Starting current decreases and torque increases Starting current and torque increases
Answer Explanation

MCQs 15: The atomic number of silicon and germanium is

32, 14 12, 19 14, 32 19, 12
Answer Explanation

MCQs 16: To move electrons from valence band to conduction band, the energy applied to the insulator is

Less than 15 eV Equal to 15 eV More than 15 eV More than 25 eV
Answer Explanation

MCQs 17: Valence electrons of silicon and germanium are

2, 4 4, 4 4, 2 2, 2
Answer Explanation

MCQs 18: At low temperature, the semi conductor behaves as a

Perfect insulator Perfect conductor Perfect consulator None of these
Answer Explanation

MCQs 19: If an external electric field is applied across the intrinsic semiconductor, then the

More number of electron holes pair combination will be broken More number of electron holes pair combination will be evolved Less number of electron holes pair combination will be broken Less number of electron holes pair combination will be evolved
Answer Explanation

MCQs 20: According, to Kirchoff’s voltage law

The algebraic sum of all the e.m.f’s in the circuit is zero Algebraic sum all the voltage drops in the circuit is zero Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero All of these
Answer Explanation

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