Q.421 In residential wiring in practice for earthing the following method is adopted
A. Neutral Earthing
B. Pipe Earthing
C. Plate Earthing
D. Resistance Earthing
Ans.: C
Q.422 As temp. increases, the resistance value also increases in
A. Conductor
B. Insulator
C. Semiconductor
D. all of above
Ans.: A
Q.423 The D.C machine cannot be used for high voltage application due to
A. Commutation problem
B. Overloading
C. Regulation
D. None of above
Ans.: A
Q. 424 In transformer in Distribution usually we consider
A. Commercial Efficiency
B. Thermal Efficiency
C. All day Efficiency
D. None of the above
Ans.: C
Q.425 The major drawback of Induction motor is
A. Low starting torque
B. Large starting current
C. Poor power factor
D. None of above
Ans.: C
Q.426 The advantages of digital display devices are
A. Human error in reading can be eliminated
B. Low power factor
C. Both A and B
D. Neither of A and B
Ans.: C
Q.427 In Interconnected system
A. Reliability increased
B. Cascade tripping may occur
C. Less Installing capacity of generator
D. all of above
Ans.: D
Q.428 The Hall Effect Sensor can be used for
A. Low power consumption
B. Measurement of HV AC and DC
C. Measurement of HV AC and DC current
D. all of the above
Ans.: D
Q.429 The disadvantage of digital relaying system
A. Requires signal processing component
B. High burden
C. Flexible
D. all of above
Ans.: A
Q.430 The relative permittivity of air is
A. 8.854 x 10^-12 µF/m
B. 1
C. 0
D. None of above
Ans.: B
Q.431 4 resistors of equal value, when connected in series across 250 V supply volts dissipate 25 Watt. If same resistors are connected in parallel, the power dissipation will be
A. 25 Watt
B. 100 Watt
C. 200 Watt
D. 400 Watt
Ans.: D
Q.432 Superposition theorem may be applied only to circuit elements
A. Passive
B. Non-linear
C. Linear Bilateral
D. None of above
Ans.: C
Q.433 One unit electrical energy is equal to
A. 36×10^5kcal
B. 4186 kcal
C. 9.81 kcal
D. 860 kcal
Ans.: D
Q.434 Potential inside a hollow charged surface is
A. Same as on its surface
B. Greater than that on its surface
C. Less than that on its surface
D. zero
Ans.: A
Q.435 If two coils having self inductances L1 and L2 and small mutual inductance M are connected in series opposition, then total inductance will be
A. L1+L2 +2M
B. L1+L2 -2M
C. L1-L2 -2M
D. L1-L2 +2M
Ans.: B